diff --git a/site_ansto/instrument/config/environment/hiden_xcs_sct.tcl b/site_ansto/instrument/config/environment/hiden_xcs_sct.tcl
index f0e6d53e..e8d15c08 100644
--- a/site_ansto/instrument/config/environment/hiden_xcs_sct.tcl
+++ b/site_ansto/instrument/config/environment/hiden_xcs_sct.tcl
@@ -288,14 +288,14 @@ proc ::scobj::hiden_xcs::pid_flow {tc_root sp pv} {
     set p_value [expr {[sct pid_pvalue] * [sct pid_error]}]
     set d_value [expr {[sct pid_dvalue] * (${pv} - [sct oldval])}]
     sct pid_deriv [sct pid_error]
-    sct pid_integ [expr {[sct pid_integ] + [sct pid_error]}]
+    sct pid_integ [expr {[sct pid_integ] + [sct pid_error] * [sct pid_ivalue]}]
     if { [sct pid_integ] > [sct pid_imax] } {
       sct pid_integ [sct pid_imax]
     }
     if { [sct pid_integ] < -[sct pid_imax] } {
       sct pid_integ -[sct pid_imax]
     }
-    set i_value [expr {[sct pid_ivalue] * [sct pid_integ]}]
+    set i_value [sct pid_integ]
     set pid [expr {${p_value} + ${i_value} + ${d_value}}]
 # pid_flow hook code starts
     if { ![hval ${tc_root}/auto] } {
@@ -327,14 +327,14 @@ proc ::scobj::hiden_xcs::pid_humidity {tc_root sp pv} {
     set p_value [expr {[sct pid_pvalue] * [sct pid_error]}]
     set d_value [expr {[sct pid_dvalue] * (${pv} - [sct oldval])}]
     sct pid_deriv [sct pid_error]
-    sct pid_integ [expr {[sct pid_integ] + [sct pid_error]}]
+    sct pid_integ [expr {[sct pid_integ] + [sct pid_error] * [sct pid_ivalue]}]
     if { [sct pid_integ] > [sct pid_imax] } {
       sct pid_integ [sct pid_imax]
     }
     if { [sct pid_integ] < -[sct pid_imax] } {
       sct pid_integ -[sct pid_imax]
     }
-    set i_value [expr {[sct pid_ivalue] * [sct pid_integ]}]
+    set i_value [sct pid_integ]
     set pid [expr {${p_value} + ${i_value} + ${d_value}}]
 # pid_humidity hook code starts
     if { ![hval ${tc_root}/auto] } {
@@ -1333,8 +1333,8 @@ proc add_hiden_xcs {name ip_address tcp_port id} {
   ::scobj::hiden_xcs::add_driver ${name} "environment" ${simulation_flag} ${ip_address} ${tcp_port} ${id}
 }
 
-clientput "file evaluation of sct_hiden_xcs.tcl"
-::scobj::hiden_xcs::sics_log 9 "file evaluation of sct_hiden_xcs.tcl"
+clientput "file evaluation of hiden_xcs_sct.tcl"
+::scobj::hiden_xcs::sics_log 9 "file evaluation of hiden_xcs_sct.tcl"
 
 proc ::scobj::hiden_xcs::read_config {} {
   set catch_status [ catch {
diff --git a/site_ansto/instrument/util/gen_sct.py b/site_ansto/instrument/util/gen_sct.py
index 8e651665..97dbc0bb 100755
--- a/site_ansto/instrument/util/gen_sct.py
+++ b/site_ansto/instrument/util/gen_sct.py
@@ -1372,14 +1372,14 @@ def put_pid_function(MyDriver, func):
     txt += ['    set p_value [expr {[sct pid_pvalue] * [sct pid_error]}]']
     txt += ['    set d_value [expr {[sct pid_dvalue] * (${pv} - [sct oldval])}]']
     txt += ['    sct pid_deriv [sct pid_error]']
-    txt += ['    sct pid_integ [expr {[sct pid_integ] + [sct pid_error]}]']
+    txt += ['    sct pid_integ [expr {[sct pid_integ] + [sct pid_error] * [sct pid_ivalue]}]']
     txt += ['    if { [sct pid_integ] > [sct pid_imax] } {']
     txt += ['      sct pid_integ [sct pid_imax]']
     txt += ['    }']
     txt += ['    if { [sct pid_integ] < -[sct pid_imax] } {']
     txt += ['      sct pid_integ -[sct pid_imax]']
     txt += ['    }']
-    txt += ['    set i_value [expr {[sct pid_ivalue] * [sct pid_integ]}]']
+    txt += ['    set i_value [sct pid_integ]']
     txt += ['    set pid [expr {${p_value} + ${i_value} + ${d_value}}]']
     if func in MyDriver['Funcs'] and len(MyDriver['Funcs'][func]['text']) > 0:
         txt += ['# %s hook code starts' % func]