diff --git a/slsDetectorServers/xilinx_ctbDetectorServer/bin/xilinx_ctbDetectorServer_developer b/slsDetectorServers/xilinx_ctbDetectorServer/bin/xilinx_ctbDetectorServer_developer
index d3c921dfe..614960290 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 af5804c82..7bed0d759 100644
--- a/slsDetectorServers/xilinx_ctbDetectorServer/slsDetectorFunctionList.c
+++ b/slsDetectorServers/xilinx_ctbDetectorServer/slsDetectorFunctionList.c
@@ -413,9 +413,16 @@ void setupDetector() {
     }
 
     LOG(logINFOBLUE, ("Powering down all dacs\n"));
-    for (int idac = 0; idac < NDAC; ++idac) {
+    for (int idac = 0; idac < NDAC_ONLY; ++idac) {
         setDAC(idac, LTC2620_D_GetPowerDownValue(), 0);
     }
+    for (int idac = NDAC_ONLY; idac < NDAC; ++idac) {
+        if (idac == D_PWR_EMPTY)
+            continue;
+        int min = (idac == D_PWR_IO) ? VIO_MIN_MV : POWER_RGLTR_MIN;
+        // will not enable power at startup (dacValues = -1)
+        setPower(idac, min);
+    }
 
     resetFlow();
     cleanFifos();
@@ -1296,6 +1303,9 @@ int getPower(enum DACINDEX ind) {
 }
 
 void setPower(enum DACINDEX ind, int val) {
+    if (val < 0)
+        return;
+
     // validate index and get bit offset in ctrl register
     int bitOffset = getBitOffsetFromDACIndex(ind);
     if (bitOffset == -1) {
@@ -1303,10 +1313,6 @@ void setPower(enum DACINDEX ind, int val) {
     }
     uint32_t addr = CTRL_REG;
     uint32_t mask = (1 << bitOffset);
-
-    if (val == -1)
-        return;
-
     char *powerNames[] = {PWR_NAMES};
     int pwrIndex = (int)(ind - D_PWR_D);
     LOG(logINFO, ("Setting Power V%s to %d mV\n", powerNames[pwrIndex], val));
@@ -1322,16 +1328,10 @@ void setPower(enum DACINDEX ind, int val) {
     LOG(logDEBUG1, ("Switching off power enable\n"));
     bus_w(addr, bus_r(addr) & ~(mask));
 
-    // power down dac
-    LOG(logINFO, ("\tPowering down V%d\n", powerNames[pwrIndex]));
-    setDAC(ind, LTC2620_D_GetPowerDownValue(), 0);
-
-    //(power off is anyway done with power enable)
-    if (val == 0)
-        val = LTC2620_D_GetPowerDownValue();
+    int startup = dacValues[ind] == -1 ? 1 : 0;
 
     // convert voltage to dac (power off is anyway done with power enable)
-    if (val != LTC2620_D_GetPowerDownValue()) {
+    if (val > 0) {
 
         int dacval = -1;
         if (ConvertToDifferentRange(
@@ -1339,9 +1339,8 @@ void setPower(enum DACINDEX ind, int val) {
                 LTC2620_D_GetMinInput(), val, &dacval) == FAIL) {
             LOG(logERROR,
                 ("\tCannot convert Power V%s to dac value. Invalid value of %d "
-                 "mV. Is not between "
-                 "%d and %d mV\n",
-                 powerNames[pwrIndex], val, POWER_RGLTR_MIN, POWER_RGLTR_MAX));
+                 "mV.n",
+                 powerNames[pwrIndex], val));
             return;
         }
 
@@ -1351,7 +1350,7 @@ void setPower(enum DACINDEX ind, int val) {
         setDAC(ind, dacval, 0);
 
         // if valid, enable power
-        if (dacval >= 0) {
+        if (dacval >= 0 && startup == 0) {
             LOG(logDEBUG1, ("Switching on power enable\n"));
             bus_w(addr, bus_r(addr) | mask);
         }
diff --git a/slsDetectorSoftware/tests/Caller/test-Caller-chiptestboard.cpp b/slsDetectorSoftware/tests/Caller/test-Caller-chiptestboard.cpp
index 795937ee1..a36576d7d 100644
--- a/slsDetectorSoftware/tests/Caller/test-Caller-chiptestboard.cpp
+++ b/slsDetectorSoftware/tests/Caller/test-Caller-chiptestboard.cpp
@@ -1046,6 +1046,12 @@ TEST_CASE("v_abcd", "[.cmdcall]") {
             if (det_type == defs::CHIPTESTBOARD ||
                 det_type == defs::XILINX_CHIPTESTBOARD) {
                 auto prev_val = det.getPower(indices[i]);
+                // this is the first command touching power dacs, should not be
+                // -100
+                if (det_type == defs::XILINX_CHIPTESTBOARD) {
+                    REQUIRE(prev_val.any(-100) == false);
+                    REQUIRE(prev_val.any(-1) == false);
+                }
                 {
                     std::ostringstream oss;
                     caller.call(cmds[i], {"0"}, -1, PUT, oss);
diff --git a/slsSupportLib/include/sls/versionAPI.h b/slsSupportLib/include/sls/versionAPI.h
index 8e7c2d493..245acb823 100644
--- a/slsSupportLib/include/sls/versionAPI.h
+++ b/slsSupportLib/include/sls/versionAPI.h
@@ -7,6 +7,6 @@
 #define APIGOTTHARD2 "0.0.0 0x250909"
 #define APIMOENCH    "0.0.0 0x250909"
 #define APIEIGER     "0.0.0 0x250909"
-#define APIXILINXCTB "0.0.0 0x260122"
+#define APIXILINXCTB "0.0.0 0x260128"
 #define APIJUNGFRAU  "0.0.0 0x250909"
 #define APIMYTHEN3   "0.0.0 0x250922"