diff --git a/site_ansto/instrument/rsd/config/plc/plc.tcl b/site_ansto/instrument/rsd/config/plc/plc.tcl
index 80ff9dfb..d7e9d32c 100644
--- a/site_ansto/instrument/rsd/config/plc/plc.tcl
+++ b/site_ansto/instrument/rsd/config/plc/plc.tcl
@@ -1,5 +1,8 @@
-MakeAsyncQueue plc_chan SafetyPLC 137.157.204.65 30002
-MakeSafetyPLC plc plc_chan 0
+set sim_mode [SplitReply [plc_simulation]]
+if {$sim_mode == "false"} { 
+  MakeAsyncQueue plc_chan SafetyPLC 137.157.204.65 30002
+  MakeSafetyPLC plc plc_chan 0
+}
 
 source $cfPath(plc)/plc_common_1.tcl