diff --git a/slsDetectorServers/ctbDetectorServer/bin/ctbDetectorServer_developer b/slsDetectorServers/ctbDetectorServer/bin/ctbDetectorServer_developer
index 34fc895ae..0ec3f81c0 100755
Binary files a/slsDetectorServers/ctbDetectorServer/bin/ctbDetectorServer_developer and b/slsDetectorServers/ctbDetectorServer/bin/ctbDetectorServer_developer differ
diff --git a/slsDetectorServers/ctbDetectorServer/slsDetectorFunctionList.c b/slsDetectorServers/ctbDetectorServer/slsDetectorFunctionList.c
index e7f914ca1..9d52ea724 100644
--- a/slsDetectorServers/ctbDetectorServer/slsDetectorFunctionList.c
+++ b/slsDetectorServers/ctbDetectorServer/slsDetectorFunctionList.c
@@ -1238,9 +1238,7 @@ void setDAC(enum DACINDEX ind, int val, int mV) {
     // convert to dac units
     else if (LTC2620_VoltageToDac(val, &dacval) == OK) {
         dacValues[ind] = dacval;
-    }
-#else
-    if (LTC2620_SetDACValue((int)ind, val, mV, &dacval) == OK)
+    } else if (LTC2620_SetDACValue((int)ind, val, mV, &dacval) == OK)
         dacValues[ind] = dacval;
 #endif
 }
@@ -1259,12 +1257,6 @@ int getDAC(enum DACINDEX ind, int mV) {
 
 int getMaxDacSteps() { return LTC2620_GetMaxNumSteps(); }
 
-int dacToVoltage(int dac) {
-    int val;
-    LTC2620_DacToVoltage(dac, &val);
-    return val;
-}
-
 int checkVLimitCompliant(int mV) {
     if (vLimit > 0 && mV > vLimit)
         return FAIL;
@@ -1352,7 +1344,13 @@ int getVChipToSet(enum DACINDEX ind, int val) {
     for (int ipwr = 0; ipwr < NPWR - 1; ++ipwr) {
 
         // get the dac values for each adc
-        int dacmV = getPower(getDACIndexFromADCIndex(ipwr));
+        char emsg[MAX_STR_LENGTH];
+        int dacmV = -1;
+        if (getPower(ipwr, &dacmV, emsg) == FAIL) {
+            LOG(logERROR, ("Could not get power %d to calculate vchip. %s\n",
+                           ipwr, emsg));
+            return -1;
+        }
 
         // if current index, replace with value to be set
         if (ipwr == adcIndex) {
@@ -1378,6 +1376,42 @@ int getVChipToSet(enum DACINDEX ind, int val) {
     return max;
 }
 
+int dacToVoltage_PowerRegulators(int pwrIndex, int dac_value, int *retval_mV,
+                                 char *mess) {
+    *retval_mV = -1;
+    char *powerNames[] = {PWR_NAMES};
+    if (ConvertToDifferentRange(LTC2620_GetMaxInput(), LTC2620_GetMinInput(),
+                                POWER_RGLTR_MIN, POWER_RGLTR_MAX, dac_value,
+                                retval_mV) == FAIL) {
+        snprintf(mess, MAX_STR_LENGTH,
+                 "Could not convert dac value %d to mV for Power %s\n",
+                 dac_value, powerNames[pwrIndex]);
+        LOG(logERROR, (mess));
+        return FAIL;
+    }
+    return OK;
+}
+
+int voltageToDac_PowerRegulators(int pwrIndex, int voltage, int *retval_dac,
+                                 char *mess) {
+    *retval_dac = -1;
+    char *powerNames[] = {PWR_NAMES};
+
+    if (ConvertToDifferentRange(POWER_RGLTR_MIN, POWER_RGLTR_MAX,
+                                LTC2620_GetMaxInput(), LTC2620_GetMinInput(),
+                                voltage, retval_dac) == FAIL) {
+        int min = pwrIndex == V_PWR_IO ? VIO_MIN_MV : POWER_RGLTR_MIN;
+        int max = getVchip() - VCHIP_POWER_INCRMNT;
+        snprintf(mess, MAX_STR_LENGTH,
+                 "Could not convert Power %s to dac value. Invalid value of "
+                 "%d mV. Should be between %d and %d mV\n",
+                 powerNames[pwrIndex], voltage, min, max);
+        LOG(logERROR, (mess));
+        return FAIL;
+    }
+    return OK;
+}
+
 int getDACIndexFromADCIndex(enum ADCINDEX ind) {
     switch (ind) {
     case V_PWR_IO:
@@ -1414,46 +1448,103 @@ int getADCIndexFromDACIndex(enum DACINDEX ind) {
     }
 }
 
-int isPowerValid(enum DACINDEX ind, int val) {
-    int min = (ind == D_PWR_IO) ? VIO_MIN_MV : POWER_RGLTR_MIN;
+void powerEnable(int on, int pwrIndex) {
+    uint32_t addr = POWER_REG;
+    int offset = POWER_ENBL_VLTG_RGLTR_OFST + pwrIndex;
+    uint32_t mask = (1 << offset);
 
-    // not power_rgltr_max because it is allowed only upto vchip max - 200
-    if (val != 0 && (val != LTC2620_GetPowerDownValue()) &&
-        (val < min || val > (VCHIP_MAX_MV - VCHIP_POWER_INCRMNT))) {
-        return 0;
+    if (on) {
+        // Switch on power enable
+        LOG(logINFO, ("\tSwitching on power enable\n"));
+        bus_w(addr, bus_r(addr) | mask);
+    } else {
+        // Switch off power enable
+        LOG(logINFO, ("\tSwitching off power enable\n"));
+        bus_w(addr, bus_r(addr) & ~(mask));
     }
-    return 1;
 }
 
-int getPower(enum DACINDEX ind) {
-    // validate index & get adc index
-    int adcIndex = getADCIndexFromDACIndex(ind);
-    if (adcIndex == -1) {
-        return -1;
+int getPowerEnable(int pwrIndex) {
+    int offset = POWER_ENBL_VLTG_RGLTR_OFST + pwrIndex;
+    uint32_t mask = (1 << offset);
+    return (bus_r(POWER_REG) & mask);
+}
+
+int isPowerValid(enum DACINDEX ind, int val, char *mess) {
+    char *powerNames[] = {PWR_NAMES};
+
+    // validate & get power index
+    int pwrIndex = getADCIndexFromDACIndex(ind);
+    if (pwrIndex == -1) {
+        snprintf(mess, MAX_STR_LENGTH,
+                 "Could not validate power. Invalid DAC index: %d for Power\n",
+                 ind);
+        LOG(logERROR, (mess));
+        return FAIL;
+    }
+
+    // check vlimit
+    if (checkVLimitCompliant(val) == FAIL) {
+        snprintf(mess, MAX_STR_LENGTH,
+                 "Power %s value %d mV exceeds vLimit of %d mV\n",
+                 powerNames[pwrIndex], val, vLimit);
+        LOG(logERROR, (mess));
+        return FAIL;
+    }
+
+    // validate within bounds
+    // not power_rgltr_max because it is allowed only upto vchip max - 200
+    int min = pwrIndex == V_PWR_IO ? VIO_MIN_MV : POWER_RGLTR_MIN;
+    int max = VCHIP_MAX_MV - VCHIP_POWER_INCRMNT;
+    if ((val != 0 && (val != LTC2620_GetPowerDownValue()) && val < min) ||
+        val > max) {
+        snprintf(mess, MAX_STR_LENGTH,
+                 "Invalid value of %d mV for Power %s. Can be -100, 0 or "
+                 "between %d and %d mV\n",
+                 val, powerNames[pwrIndex], min, max);
+        LOG(logERROR, (mess));
+        return FAIL;
+    }
+    return OK;
+}
+
+int getPower(enum DACINDEX ind, int *retval, char *mess) {
+    *retval = -1;
+    char *powerNames[] = {PWR_NAMES};
+
+    // validate & get power index
+    int pwrIndex = getADCIndexFromDACIndex(ind);
+    if (pwrIndex == -1) {
+        snprintf(mess, MAX_STR_LENGTH,
+                 "Could not validate power. Invalid DAC index: %d for Power\n",
+                 ind);
+        LOG(logERROR, (mess));
+        return FAIL;
     }
 
     // powered enable off
-    {
-        uint32_t addr = POWER_REG;
-        uint32_t offset = POWER_ENBL_VLTG_RGLTR_OFST + adcIndex;
-        uint32_t mask = (1 << offset);
-        if (!(bus_r(addr) & mask))
-            return 0;
+    if (getPowerEnable(pwrIndex) == 0) {
+        *retval = 0;
+        return OK;
     }
 
-    // not set yet
+    // dac value not set by user yet
     if (dacValues[ind] == -1) {
-        LOG(logERROR,
-            ("Power enabled, but unknown dac value for power index %d!", ind));
-        return -1;
+        snprintf(mess, MAX_STR_LENGTH,
+                 "Power %s not initialized to a value yet (other than 0). "
+                 "Cannot get value.\n",
+                 powerNames[pwrIndex]);
+        LOG(logERROR, (mess));
+        return FAIL;
     }
 
-    // dac powered off
+    // dac powered down
     if (dacValues[ind] == LTC2620_GetPowerDownValue()) {
         LOG(logWARNING,
             ("Power %d enabled, dac value %d, voltage at minimum or 0\n", ind,
              LTC2620_GetPowerDownValue()));
-        return LTC2620_GetPowerDownValue();
+        *retval = LTC2620_GetPowerDownValue();
+        return OK;
     }
 
     // vchip not set, weird error, should not happen (as vchip set to max in the
@@ -1461,100 +1552,100 @@ int getPower(enum DACINDEX ind) {
     // tried to get a power regulator value
     if (dacValues[D_PWR_CHIP] == -1 ||
         dacValues[D_PWR_CHIP] == LTC2620_GetPowerDownValue()) {
-        LOG(logERROR, ("Cannot read power regulator %d (vchip not set)."
-                       "Set a power regulator, which will also set vchip.\n"));
-        return -1;
+        snprintf(mess, MAX_STR_LENGTH,
+                 "Power %s cannot be read as vchip is not set. Set a power "
+                 "regulator first, which will also set vchip.\n",
+                 powerNames[pwrIndex]);
+        LOG(logERROR, (mess));
+        return FAIL;
     }
 
-    // convert dac to voltage
-    int retval = -1;
-    ConvertToDifferentRange(LTC2620_GetMaxInput(), LTC2620_GetMinInput(),
-                            POWER_RGLTR_MIN, POWER_RGLTR_MAX, dacValues[ind],
-                            &retval);
-    return retval;
+    // get dac in mV
+    if (dacToVoltage_PowerRegulators(pwrIndex, dacValues[ind], retval, mess) ==
+        FAIL)
+        return FAIL;
+
+    return OK;
 }
 
-void setPower(enum DACINDEX ind, int val) {
-    // validate index & get adc index
-    int adcIndex = getADCIndexFromDACIndex(ind);
-    if (adcIndex == -1) {
-        return;
+int setPower(enum DACINDEX ind, int val, char *mess) {
+    char *powerNames[] = {PWR_NAMES};
+
+    // validate & get power index
+    int pwrIndex = getADCIndexFromDACIndex(ind);
+    if (pwrIndex == -1) {
+        snprintf(mess, MAX_STR_LENGTH,
+                 "Could not validate power. Invalid DAC index: %d for Power\n",
+                 ind);
+        LOG(logERROR, (mess));
+        return FAIL;
     }
 
-    uint32_t addr = POWER_REG;
-    uint32_t offset = POWER_ENBL_VLTG_RGLTR_OFST + adcIndex;
-    uint32_t mask = (1 << offset);
-
-    // set power
-    if (val != -1) {
-        LOG(logINFO, ("Setting Power to %d mV\n", val));
-
-        // validate value (already checked at tcp)
-        if (!isPowerValid(ind, val)) {
-            LOG(logERROR,
-                ("Invalid value of %d mV for Power %d. Is not between %d and "
-                 "%d mV\n",
-                 val, ind, (ind == D_PWR_IO ? VIO_MIN_MV : POWER_RGLTR_MIN),
-                 POWER_RGLTR_MAX));
-            return;
-        }
-
-        // get vchip to set vchip (calculated now before switching off power
-        // enable)
-        int vchip = getVChipToSet(ind, val);
-        LOG(logDEBUG1, ("Vchip to set: %d\n", vchip));
-        // index problem of vchip calculation problem
-        if (vchip == -1)
-            return;
-
-        // Switch off power enable
-        LOG(logDEBUG1, ("Switching off power enable\n"));
-        bus_w(addr, bus_r(addr) & ~(mask));
-
-        // power down dac
-        LOG(logDEBUG1, ("Powering off P%d (DAC %d)\n", adcIndex, ind));
-        setDAC(ind, LTC2620_GetPowerDownValue(), 0);
-
-        // set vchip
-        setVchip(vchip);
-        if (getVchip() != vchip) {
-            LOG(logERROR, ("Weird, Could not set vchip. Set %d, read %d\n.",
-                           vchip, getVchip()));
-            return;
-        }
-
-        //(power off is anyway done with power enable)
-        if (val == 0)
-            val = LTC2620_GetPowerDownValue();
-
-        // convert it to dac (power off is anyway done with power enable)
-        if (val != LTC2620_GetPowerDownValue()) {
-            LOG(logDEBUG1, ("Convert Power of %d mV to dac units\n", val));
-
-            int dacval = -1;
-            // convert voltage to dac
-            if (ConvertToDifferentRange(
-                    POWER_RGLTR_MIN, POWER_RGLTR_MAX, LTC2620_GetMaxInput(),
-                    LTC2620_GetMinInput(), val, &dacval) == FAIL) {
-                LOG(logERROR,
-                    ("\tPower index %d of value %d mV invalid. Is not between "
-                     "%d and %d mV\n",
-                     ind, val, POWER_RGLTR_MIN, vchip - VCHIP_POWER_INCRMNT));
-                return;
-            }
-
-            // set and power on/ update dac
-            LOG(logINFO, ("Setting P%d (DAC %d): %d dac (%d mV)\n", adcIndex,
-                          ind, dacval, val));
-            setDAC(ind, dacval, 0);
-
-            // to be sure of valid conversion
-            if (dacval >= 0) {
-                LOG(logDEBUG1, ("Switching on power enable\n"));
-                bus_w(addr, bus_r(addr) | mask);
-            }
-        }
+    if (isPowerValid(ind, val, mess) == FAIL) {
+        return FAIL;
     }
+
+    LOG(logINFO, ("Setting Power %s to %d mV\n", powerNames[pwrIndex], val));
+
+    // get vchip to set vchip (calculated now before switching off power
+    // enable)
+    int vchip = getVChipToSet(ind, val);
+    LOG(logDEBUG1, ("Vchip to set: %d\n", vchip));
+    // index issue of vchip calculation
+    if (vchip == -1) {
+        snprintf(mess, MAX_STR_LENGTH,
+                 "Could not set power %s. Calculated vchip to set is beyond "
+                 "its maximum range.\n",
+                 powerNames[pwrIndex]);
+        LOG(logERROR, (mess));
+        return FAIL;
+    }
+
+    powerEnable(0, pwrIndex);
+
+    // power down dac
+    LOG(logDEBUG1, ("Powering off %s\n", powerNames[pwrIndex]));
+    setDAC(ind, LTC2620_GetPowerDownValue(), 0);
+
+    // set vchip
+    setVchip(vchip);
+    if (getVchip() != vchip) {
+        snprintf(mess, MAX_STR_LENGTH,
+                 "Could not set power %s. Tried to set vchip to %d mV, read %d "
+                 "mV\n.",
+                 powerNames[pwrIndex], vchip, getVchip());
+        LOG(logERROR, (mess));
+        return FAIL;
+    }
+
+    //(power off is anyway done with power enable)
+    if (val == 0)
+        val = LTC2620_GetPowerDownValue();
+
+    // convert it to dac (power off is anyway done with power enable)
+    if (val != LTC2620_GetPowerDownValue()) {
+
+        // convert mV to dac value
+        int dacval = -1;
+        if (voltageToDac_PowerRegulators(pwrIndex, val, &dacval, mess) == FAIL)
+            return FAIL;
+
+        // set dac value
+        LOG(logINFO, ("\tSetting %s: %d mV (%d dac)\n", powerNames[pwrIndex],
+                      val, dacval));
+        setDAC(ind, dacval, 0);
+        if (dacval == -1) {
+            snprintf(mess, MAX_STR_LENGTH,
+                     "Could not set power %s. Tried to set dac value to %d\n.",
+                     powerNames[pwrIndex], dacval);
+            LOG(logERROR, (mess));
+            return FAIL;
+        }
+
+        powerEnable(1, pwrIndex);
+    }
+
+    return OK;
 }
 
 void powerOff() {
diff --git a/slsDetectorServers/ctbDetectorServer/slsDetectorServer_defs.h b/slsDetectorServers/ctbDetectorServer/slsDetectorServer_defs.h
index ab899fdb9..74aedc810 100644
--- a/slsDetectorServers/ctbDetectorServer/slsDetectorServer_defs.h
+++ b/slsDetectorServers/ctbDetectorServer/slsDetectorServer_defs.h
@@ -147,6 +147,8 @@ enum ADCINDEX {
     S_ADC7,
     S_TMP
 };
+#define PWR_NAMES "VIO", "VA", "VB", "VC", "VD"
+
 enum DACINDEX {
     D0,
     D1,
@@ -173,5 +175,6 @@ enum DACINDEX {
     D_PWR_A,
     D_PWR_IO
 };
+
 enum CLKINDEX { RUN_CLK, ADC_CLK, SYNC_CLK, DBIT_CLK, NUM_CLOCKS };
 #define CLK_NAMES "run", "adc", "sync", "dbit"
diff --git a/slsDetectorServers/slsDetectorServer/include/slsDetectorFunctionList.h b/slsDetectorServers/slsDetectorServer/include/slsDetectorFunctionList.h
index e3f44e673..0f4186a8d 100644
--- a/slsDetectorServers/slsDetectorServer/include/slsDetectorFunctionList.h
+++ b/slsDetectorServers/slsDetectorServer/include/slsDetectorFunctionList.h
@@ -381,7 +381,16 @@ void setDAC(enum DACINDEX ind, int val, int mV);
 int getDAC(enum DACINDEX ind, int mV);
 int getMaxDacSteps();
 #if defined(CHIPTESTBOARDD) || defined(XILINX_CHIPTESTBOARDD)
-int dacToVoltage(int dac);
+int dacToVoltage_PowerRegulators(int pwrIndex, int dac_value, int *retval,
+                                 char *mess);
+int voltageToDac_PowerRegulators(int pwrIndex, int voltage, int *retval,
+                                 char *mess);
+void powerEnable(int on, int pwrIndex);
+int getPowerEnable(int pwrIndex);
+int isPowerValid(enum DACINDEX ind, int val, char *mess);
+int getPower(enum DACINDEX ind, int *retval, char *mess);
+int setPower(enum DACINDEX ind, int val, char *mess);
+
 int checkVLimitCompliant(int mV);
 int checkVLimitDacCompliant(int dac);
 int getVLimit();
@@ -395,16 +404,11 @@ void setVchip(int val);
 int getVChipToSet(enum DACINDEX ind, int val);
 int getDACIndexFromADCIndex(enum ADCINDEX ind);
 int getADCIndexFromDACIndex(enum DACINDEX ind);
-int isPowerValid(enum DACINDEX ind, int val);
-int getPower();
-void setPower(enum DACINDEX ind, int val);
+
 void powerOff();
 #elif XILINX_CHIPTESTBOARDD
+int getPwrIndex(enum DACINDEX ind);
 int getBitOffsetFromDACIndex(enum DACINDEX ind);
-int getMinPowerValue(enum DACINDEX ind);
-int isPowerValid(enum DACINDEX ind, int val);
-int getPower();
-int setPower(enum DACINDEX ind, int val);
 #endif
 
 #if defined(MYTHEN3D) || defined(GOTTHARD2D) || defined(XILINX_CHIPTESTBOARDD)
diff --git a/slsDetectorServers/slsDetectorServer/src/slsDetectorServer_funcs.c b/slsDetectorServers/slsDetectorServer/src/slsDetectorServer_funcs.c
index 2704fffd1..c44abeede 100644
--- a/slsDetectorServers/slsDetectorServer/src/slsDetectorServer_funcs.c
+++ b/slsDetectorServers/slsDetectorServer/src/slsDetectorServer_funcs.c
@@ -1283,48 +1283,14 @@ int validateAndSetDac(enum dacIndex ind, int val, int mV) {
                         "exceeds voltage limit %d.\n",
                         ind, getVLimit());
                 LOG(logERROR, (mess));
-            }
-
-            else if (!isPowerValid(serverDacIndex, val)) {
-                ret = FAIL;
-                sprintf(
-                    mess,
-                    "Could not set power. Power regulator %d "
-                    "should be between %d and %d mV\n",
-                    ind,
-                    (serverDacIndex == D_PWR_IO ? VIO_MIN_MV : POWER_RGLTR_MIN),
-#ifdef CHIPTESTBOARDD
-                    (VCHIP_MAX_MV - VCHIP_POWER_INCRMNT));
-#else
-                    POWER_RGLTR_MAX);
-#endif
-                LOG(logERROR, (mess));
-            }
-
-            else {
-#ifdef XILINX_CHIPTESTBOARDD
-                ret = setPower(serverDacIndex, val);
-                if (ret == FAIL) {
-                    sprintf(mess,
-                            "Setting power regulator %d to value %d failed.\n",
-                            serverDacIndex, val);
-                    LOG(logERROR, (mess));
-                }
-#else
-                setPower(serverDacIndex, val);
-#endif
+            } else {
+                ret = setPower(serverDacIndex, val, mess);
             }
         }
         if (ret == OK) {
-            retval = getPower(serverDacIndex);
+            ret = getPower(serverDacIndex, &retval, mess);
             LOG(logDEBUG1,
                 ("Power regulator(%d): %d\n", serverDacIndex, retval));
-            if (retval == -1) {
-                ret = FAIL;
-                sprintf(mess, "Could not get power regulator %d.\n",
-                        serverDacIndex);
-                LOG(logERROR, (mess));
-            }
             validate(&ret, mess, val, retval, "set/get power regulator", DEC);
         }
         break;
@@ -1401,9 +1367,9 @@ int validateAndSetDac(enum dacIndex ind, int val, int mV) {
                  checkVLimitDacCompliant(val) == FAIL)) {
                 ret = FAIL;
                 sprintf(mess,
-                        "Could not set dac %d to value %d. "
-                        "Exceeds voltage limit %d.\n",
-                        ind, (mV ? val : dacToVoltage(val)), getVLimit());
+                        "Could not set dac %d. "
+                        "Exceeds voltage limit %d mV.\n",
+                        ind, getVLimit());
                 LOG(logERROR, (mess));
             } else
 #endif
diff --git a/slsDetectorServers/xilinx_ctbDetectorServer/bin/xilinx_ctbDetectorServer_developer b/slsDetectorServers/xilinx_ctbDetectorServer/bin/xilinx_ctbDetectorServer_developer
index 1f972aca2..78bc7052b 100755
Binary files a/slsDetectorServers/xilinx_ctbDetectorServer/bin/xilinx_ctbDetectorServer_developer and b/slsDetectorServers/xilinx_ctbDetectorServer/bin/xilinx_ctbDetectorServer_developer differ
diff --git a/slsDetectorServers/xilinx_ctbDetectorServer/slsDetectorFunctionList.c b/slsDetectorServers/xilinx_ctbDetectorServer/slsDetectorFunctionList.c
index a3f56544d..92b4bdfb4 100644
--- a/slsDetectorServers/xilinx_ctbDetectorServer/slsDetectorFunctionList.c
+++ b/slsDetectorServers/xilinx_ctbDetectorServer/slsDetectorFunctionList.c
@@ -414,13 +414,21 @@ void setupDetector() {
 
     LOG(logINFOBLUE, ("Powering down all dacs\n"));
     for (int idac = 0; idac < NDAC_ONLY; ++idac) {
-        setDAC(idac, LTC2620_D_GetPowerDownValue(), 0);
+        initError = setDAC(idac, LTC2620_D_GetPowerDownValue(), 0);
+        if (initError == FAIL) {
+            snprintf(initErrorMessage, MAX_STR_LENGTH,
+                     "Could not power down dac %d\n", idac);
+            LOG(logERROR, (initErrorMessage));
+            return;
+        }
     }
     LOG(logINFOBLUE, ("Defaulting all power regulators to minimum.\n"));
     for (int idac = NDAC_ONLY; idac < NDAC; ++idac) {
         if (idac == D_PWR_EMPTY)
             continue;
-        setPower(idac, 0);
+        initError = setPower(idac, 0, initErrorMessage);
+        if (initError == FAIL)
+            return;
     }
 
     resetFlow();
@@ -1205,8 +1213,8 @@ int getDAC(enum DACINDEX ind, int mV) {
         return dacValues[ind];
     }
     // convert dac units to mV
-    int voltage = dacToVoltage(dacValues[ind]);
-    if (voltage == -1) {
+    int voltage = -1;
+    if (LTC2620_D_DacToVoltage(dacValues[ind], &voltage) == FAIL) {
         LOG(logERROR, ("Could not convert %d dac units to mV for dac %d\n",
                        dacValues[ind], ind));
         return -1;
@@ -1218,14 +1226,6 @@ int getDAC(enum DACINDEX ind, int mV) {
 
 int getMaxDacSteps() { return LTC2620_D_GetMaxNumSteps(); }
 
-int dacToVoltage(int dac) {
-    int val;
-    if (LTC2620_D_DacToVoltage(dac, &val) == FAIL) {
-        return -1;
-    }
-    return val;
-}
-
 int checkVLimitCompliant(int mV) {
     if (vLimit > 0 && mV > vLimit)
         return FAIL;
@@ -1251,156 +1251,194 @@ void setVLimit(int l) {
         vLimit = l;
 }
 
-int getBitOffsetFromDACIndex(enum DACINDEX ind) {
+int dacToVoltage_PowerRegulators(int pwrIndex, int dac_value, int *retval_mV,
+                                 char *mess) {
+    *retval_mV = -1;
+    char *powerNames[] = {PWR_NAMES};
+    if (ConvertToDifferentRange(
+            LTC2620_D_GetMaxInput(), LTC2620_D_GetMinInput(), POWER_RGLTR_MIN,
+            POWER_RGLTR_MAX, dac_value, retval_mV) == FAIL) {
+        snprintf(mess, MAX_STR_LENGTH,
+                 "Could not convert dac value %d to mV for Power %s\n",
+                 dac_value, powerNames[pwrIndex]);
+        LOG(logERROR, (mess));
+        return FAIL;
+    }
+    return OK;
+}
+
+int voltageToDac_PowerRegulators(int pwrIndex, int voltage, int *retval_dac,
+                                 char *mess) {
+    *retval_dac = -1;
+    char *powerNames[] = {PWR_NAMES};
+    if (ConvertToDifferentRange(
+            POWER_RGLTR_MIN, POWER_RGLTR_MAX, LTC2620_D_GetMaxInput(),
+            LTC2620_D_GetMinInput(), voltage, retval_dac) == FAIL) {
+        int min = pwrIndex == V_PWR_IO ? VIO_MIN_MV : POWER_RGLTR_MIN;
+        snprintf(mess, MAX_STR_LENGTH,
+                 "Could not convert Power %s to dac value. Invalid value of "
+                 "%d mV. Should be between %d and %d mV\n",
+                 powerNames[pwrIndex], voltage, min, POWER_RGLTR_MAX);
+        LOG(logERROR, (mess));
+        return FAIL;
+    }
+    return OK;
+}
+
+int getPwrIndex(enum DACINDEX ind) {
     switch (ind) {
     case D_PWR_IO:
-        return POWER_VIO_OFST;
+        return V_PWR_IO; // same as POWER_VIO_OFST
     case D_PWR_A:
-        return POWER_VCC_A_OFST;
+        return V_PWR_A; // same as POWER_VCC_A_OFST
     case D_PWR_B:
-        return POWER_VCC_B_OFST;
+        return V_PWR_B; // same as POWER_VCC_B_OFST
     case D_PWR_C:
-        return POWER_VCC_C_OFST;
+        return V_PWR_C; // same as POWER_VCC_C_OFST
     case D_PWR_D:
-        return POWER_VCC_D_OFST;
+        return V_PWR_D; // same as POWER_VCC_D_OFST
     default:
-        LOG(logERROR,
-            ("DAC index %d is not defined to get offset in ctrl register\n",
-             ind));
+        LOG(logERROR, ("DAC index %d is not defined for Power\n", ind));
         return -1;
     }
 }
 
-int getMinPowerValue(enum DACINDEX ind) {
-    if (ind < D_PWR_D || ind > D_PWR_C || ind == D_PWR_EMPTY) {
-        LOG(logERROR, ("Invalid Power DAC index: %d\n", ind));
-        return -1;
+void powerEnable(int on, int pwrIndex) {
+    uint32_t addr = CTRL_REG;
+    uint32_t mask = (1 << pwrIndex);
+
+    if (on) {
+        // Switch on power enable
+        LOG(logINFO, ("\tSwitching on power enable\n"));
+        bus_w(addr, bus_r(addr) | mask);
+    } else {
+        // Switch off power enable
+        LOG(logINFO, ("\tSwitching off power enable\n"));
+        bus_w(addr, bus_r(addr) & ~(mask));
     }
-    if (ind == D_PWR_IO) {
-        return VIO_MIN_MV;
-    }
-    return POWER_RGLTR_MIN;
 }
 
-int isPowerValid(enum DACINDEX ind, int val) {
-    if (ind < D_PWR_D || ind > D_PWR_C || ind == D_PWR_EMPTY) {
-        LOG(logERROR, ("Invalid Power DAC index: %d\n", ind));
-        return -1;
-    }
+int getPowerEnable(int pwrIndex) {
+    uint32_t mask = (1 << pwrIndex);
+    return (bus_r(CTRL_REG) & mask);
+}
 
+int isPowerValid(enum DACINDEX ind, int val, char *mess) {
     char *powerNames[] = {PWR_NAMES};
-    int pwrIndex = (int)(ind - D_PWR_D);
-    int min = getMinPowerValue(ind);
 
-    // check vlimit (already checked at funcs.c)
+    // validate & get power index
+    int pwrIndex = getPwrIndex(ind);
+    if (pwrIndex == -1) {
+        snprintf(mess, MAX_STR_LENGTH,
+                 "Could not validate power. Invalid DAC index: %d for Power\n",
+                 ind);
+        LOG(logERROR, (mess));
+        return FAIL;
+    }
+
+    // check vlimit
     if (checkVLimitCompliant(val) == FAIL) {
-        LOG(logERROR,
-            ("Invalid value of %d mV for Power %s. Exceeds vLimit of %d mV\n",
-             val, powerNames[pwrIndex], vLimit));
-        return 0;
+        snprintf(mess, MAX_STR_LENGTH,
+                 "Power %s value %d mV exceeds vLimit of %d mV\n",
+                 powerNames[pwrIndex], val, vLimit);
+        LOG(logERROR, (mess));
+        return FAIL;
     }
 
-    // not power_rgltr_max because it is allowed only upto vchip max - 200
-    if ((val != 0 && val < min) || val > POWER_RGLTR_MAX) {
-        LOG(logERROR,
-            ("Invalid value of %d mV for Power %s. Is not between %d and "
-             "%d mV\n",
-             val, powerNames[pwrIndex], min, POWER_RGLTR_MAX));
-        return 0;
+    // validate within bounds
+    int min = pwrIndex == V_PWR_IO ? VIO_MIN_MV : POWER_RGLTR_MIN;
+    int max = POWER_RGLTR_MAX;
+    if ((val != 0 && val < min) || val > max) {
+        snprintf(mess, MAX_STR_LENGTH,
+                 "Invalid value of %d mV for Power %s. Can be 0 or between %d "
+                 "and %d mV\n",
+                 val, powerNames[pwrIndex], min, max);
+        LOG(logERROR, (mess));
+        return FAIL;
     }
-    return 1;
+    return OK;
 }
 
-int getPower(enum DACINDEX ind) {
-    if (ind < D_PWR_D || ind > D_PWR_C || ind == D_PWR_EMPTY) {
-        LOG(logERROR, ("Invalid Power DAC index: %d\n", ind));
-        return -1;
-    }
-    // get bit offset in ctrl register
-    int bitOffset = getBitOffsetFromDACIndex(ind);
-    if (bitOffset == -1) {
-        return -1;
-    }
-
-    // powered enable off
-    {
-        uint32_t addr = CTRL_REG;
-        uint32_t mask = (1 << bitOffset);
-        if (!(bus_r(addr) & mask))
-            return 0;
-    }
-
+int getPower(enum DACINDEX ind, int *retval, char *mess) {
+    *retval = -1;
     char *powerNames[] = {PWR_NAMES};
-    int pwrIndex = (int)(ind - D_PWR_D);
-    int min = getMinPowerValue(ind);
 
-    // not set yet
+    // validate & get power index
+    int pwrIndex = getPwrIndex(ind);
+    if (pwrIndex == -1) {
+        snprintf(mess, MAX_STR_LENGTH,
+                 "Could not validate power. Invalid DAC index: %d for Power\n",
+                 ind);
+        LOG(logERROR, (mess));
+        return FAIL;
+    }
+
+    // powered off
+    if (getPowerEnable(pwrIndex) == 0) {
+        *retval = 0;
+        return OK;
+    }
+
+    // dac value not set by user yet
     if (dacValues[ind] == -1) {
-        LOG(logERROR,
-            ("Unknown dac value for Power %s!\n", powerNames[pwrIndex]));
-        return -1;
+        snprintf(mess, MAX_STR_LENGTH,
+                 "Power %s not initialized to a value yet (other than 0). "
+                 "Cannot get value.\n",
+                 powerNames[pwrIndex]);
+        LOG(logERROR, (mess));
+        return FAIL;
     }
 
     // get dac in mV
-    int retval = -1;
-    ConvertToDifferentRange(LTC2620_D_GetMaxInput(), LTC2620_D_GetMinInput(),
-                            min, POWER_RGLTR_MAX, dacValues[ind], &retval);
+    if (dacToVoltage_PowerRegulators(pwrIndex, dacValues[ind], retval, mess) ==
+        FAIL)
+        return FAIL;
 
-    return retval;
+    return OK;
 }
 
-int setPower(enum DACINDEX ind, int val) {
-    if (ind < D_PWR_D || ind > D_PWR_C || ind == D_PWR_EMPTY) {
-        LOG(logERROR, ("Invalid Power DAC index: %d\n", ind));
-        return FAIL;
-    }
-    if (!isPowerValid(ind, val)) {
-        return FAIL;
-    }
-
-    // validate index and get bit offset in ctrl register
-    int bitOffset = getBitOffsetFromDACIndex(ind);
-    if (bitOffset == -1) {
-        return FAIL;
-    }
-    uint32_t addr = CTRL_REG;
-    uint32_t mask = (1 << bitOffset);
-
+int setPower(enum DACINDEX ind, int val, char *mess) {
     char *powerNames[] = {PWR_NAMES};
-    int pwrIndex = (int)(ind - D_PWR_D);
-    int min = getMinPowerValue(ind);
+
+    // validate & get power index
+    int pwrIndex = getPwrIndex(ind);
+    if (pwrIndex == -1) {
+        snprintf(mess, MAX_STR_LENGTH,
+                 "Could not validate power. Invalid DAC index: %d for Power\n",
+                 ind);
+        LOG(logERROR, (mess));
+        return FAIL;
+    }
+
+    if (isPowerValid(ind, val, mess) == FAIL) {
+        return FAIL;
+    }
+
     LOG(logINFO, ("Setting Power %s to %d mV\n", powerNames[pwrIndex], val));
 
-    // Switch off power enable
-    LOG(logDEBUG1, ("\tSwitching off power enable\n"));
-    bus_w(addr, bus_r(addr) & ~(mask));
+    powerEnable(0, pwrIndex);
 
     if (val > 0) {
-        // convert voltage to dac
+        // convert mV to dac value
         int dacval = -1;
-        if (ConvertToDifferentRange(
-                min, POWER_RGLTR_MAX, LTC2620_D_GetMaxInput(),
-                LTC2620_D_GetMinInput(), val, &dacval) == FAIL) {
-            LOG(logERROR,
-                ("\tCannot convert Power %s to dac value. Invalid value of %d "
-                 "mV. Is not between "
-                 "%d and %d mV\n",
-                 powerNames[pwrIndex], val, min, POWER_RGLTR_MAX));
+        if (voltageToDac_PowerRegulators(pwrIndex, val, &dacval, mess) == FAIL)
             return FAIL;
-        }
 
         // set dac value
-        LOG(logINFO, ("\tSetting DAC %s: %d mV (%d dac)\n",
-                      powerNames[pwrIndex], val, dacval));
+        LOG(logINFO, ("\tSetting %s: %d mV (%d dac)\n", powerNames[pwrIndex],
+                      val, dacval));
         if (LTC2620_D_WriteDACValue((int)ind, dacval, powerNames[pwrIndex]) ==
-            FAIL)
+            FAIL) {
+            snprintf(mess, MAX_STR_LENGTH,
+                     "Could not set Power %s to %d mV. Could not write to "
+                     "file.\n",
+                     powerNames[pwrIndex], val);
+            LOG(logERROR, (mess));
             return FAIL;
+        }
         dacValues[ind] = dacval;
 
-        // Switch on power enable
-        LOG(logDEBUG1, ("\tSwitching on power enable for Power %s\n",
-                        powerNames[pwrIndex]));
-        bus_w(addr, bus_r(addr) | mask);
+        powerEnable(1, pwrIndex);
     }
 
     return OK;
diff --git a/slsDetectorServers/xilinx_ctbDetectorServer/slsDetectorServer_defs.h b/slsDetectorServers/xilinx_ctbDetectorServer/slsDetectorServer_defs.h
index 93c5a0bee..8619bd5db 100644
--- a/slsDetectorServers/xilinx_ctbDetectorServer/slsDetectorServer_defs.h
+++ b/slsDetectorServers/xilinx_ctbDetectorServer/slsDetectorServer_defs.h
@@ -119,7 +119,15 @@ enum DACINDEX {
     D_PWR_C
 };
 
-#define PWR_NAMES "VD", "_unknown", "VIO", "VA", "VB", "VC"
+enum PWDINDEX {
+    V_PWR_IO,
+    V_PWR_A,
+    V_PWR_B,
+    V_PWR_C,
+    V_PWR_D,
+};
+
+#define PWR_NAMES "VIO", "VA", "VB", "VC", "VD"
 
 /* Struct Definitions */
 // For arm has to be multiple of 16
diff --git a/slsDetectorSoftware/tests/Caller/test-Caller-chiptestboard.cpp b/slsDetectorSoftware/tests/Caller/test-Caller-chiptestboard.cpp
index 23cb1eb03..57a0b279d 100644
--- a/slsDetectorSoftware/tests/Caller/test-Caller-chiptestboard.cpp
+++ b/slsDetectorSoftware/tests/Caller/test-Caller-chiptestboard.cpp
@@ -1060,9 +1060,9 @@ TEST_CASE("v_abcd", "[.cmdcall]") {
                 if (det_type == defs::XILINX_CHIPTESTBOARD &&
                     det.isVirtualDetectorServer().tsquash(
                         "inconsistent virtual values")) {
-                    // prev value for power regulators should have been 0
-                    // as they are only touched in this test
-                    REQUIRE(prev_val.squash(-1) == 0);
+                    // prev value for power regulators should have been 1200
+                    // (set in config) as they are only touched in this test
+                    REQUIRE(prev_val.squash(-1) == 1200);
                     REQUIRE_THROWS(caller.call(cmds[i], {"-100"}, -1, PUT));
                 }
 
diff --git a/slsSupportLib/include/sls/versionAPI.h b/slsSupportLib/include/sls/versionAPI.h
index 97dd8899c..3ca4b2b75 100644
--- a/slsSupportLib/include/sls/versionAPI.h
+++ b/slsSupportLib/include/sls/versionAPI.h
@@ -3,10 +3,10 @@
 /** API versions */
 #define APILIB       "0.0.0 0x250909"
 #define APIRECEIVER  "0.0.0 0x250822"
-#define APICTB       "0.0.0 0x250922"
+#define APICTB       "0.0.0 0x260115"
 #define APIGOTTHARD2 "0.0.0 0x260114"
 #define APIMOENCH    "0.0.0 0x250909"
 #define APIEIGER     "0.0.0 0x250909"
-#define APIXILINXCTB "0.0.0 0x260114"
+#define APIXILINXCTB "0.0.0 0x260115"
 #define APIJUNGFRAU  "0.0.0 0x250909"
 #define APIMYTHEN3   "0.0.0 0x260114"
diff --git a/tests/scripts/utils_for_test.py b/tests/scripts/utils_for_test.py
index bff86f886..80b3f2b47 100644
--- a/tests/scripts/utils_for_test.py
+++ b/tests/scripts/utils_for_test.py
@@ -234,6 +234,11 @@ def loadConfig(name, rx_hostname = 'localhost', settingsdir = None, log_file_fp
             d.powerchip = 1
 
         if name == "xilinx_ctb":
+            d.v_a = 1200
+            d.v_b = 1200
+            d.v_c = 1200
+            d.v_d = 1200
+            d.v_io = 1200
             d.configureTransceiver()
 
         if settingsdir is not None and name in ['eiger', 'mythen3']: