Index: leahi_dialin/fp/filtration_purification.py
===================================================================
diff -u -r57aed15d5b38f236deaea49daba706ce352162d2 -ra47869fc5e3c8947d1cff46a2b2038117d96919b
--- leahi_dialin/fp/filtration_purification.py	(.../filtration_purification.py)	(revision 57aed15d5b38f236deaea49daba706ce352162d2)
+++ leahi_dialin/fp/filtration_purification.py	(.../filtration_purification.py)	(revision a47869fc5e3c8947d1cff46a2b2038117d96919b)
@@ -353,7 +353,8 @@
             Transition from current to requested op sub mode must be legal.
             NOTE: for POST the FP device shall be in Standby Mode
 
-        @param new_mode:  ID of operation sub mode to transition to
+        @param new_mode:  ID of operation mode to transition to
+        @param new_sub_mode:  ID of operation sub mode to transition to
 
         @return: 1 if successful, zero otherwise
         """
@@ -362,25 +363,27 @@
         payload = mode + sub_mode
  
         if self.fp_operation_mode == 0:
-            new_mode_enum = fp_enum_repository.FPFaultStates(new_mode)
+            new_sub_mode_enum = fp_enum_repository.FPFaultStates(new_mode)
+        elif self.fp_operation_mode == fp_enum_repository.FPOpModes.MODE_STAN.value:
+            new_sub_mode_enum = fp_enum_repository.FPStandbyStates(new_mode)
         elif self.fp_operation_mode == fp_enum_repository.FPOpModes.MODE_PRE_GENP.value:
-            new_mode_enum = fp_enum_repository.FPPreGenPermeateStates(new_mode)
+            new_sub_mode_enum = fp_enum_repository.FPPreGenPermeateStates(new_mode)
         elif self.fp_operation_mode == fp_enum_repository.FPOpModes.MODE_GENP.value:
-            new_mode_enum = fp_enum_repository.FPGenPermeateStates(new_mode)
+            new_sub_mode_enum = fp_enum_repository.FPGenPermeateStates(new_mode)
         elif self.fp_operation_mode == fp_enum_repository.FPOpModes.MODE_DPGP.value:
-            new_mode_enum = fp_enum_repository.FPPreGenPDefStates(new_mode)
+            new_sub_mode_enum = fp_enum_repository.FPPreGenPDefStates(new_mode)
         elif self.fp_operation_mode == fp_enum_repository.FPOpModes.MODE_DEGP.value:
-            new_mode_enum = fp_enum_repository.FPGenPermeateDefStates(new_mode)
+            new_sub_mode_enum = fp_enum_repository.FPGenPermeateDefStates(new_mode)
         else:
-            new_mode_enum = fp_enum_repository.FPOpModes.MODE_NLEG
+            new_sub_mode_enum = fp_enum_repository.FPOpModes.MODE_NLEG
 
         return cmd_generic_override(
             payload = payload,
             reset = NO_RESET,
             channel_id = DenaliChannels.dialin_to_fp_ch_id,
             msg_id = MsgIds.MSG_ID_FP_SET_OP_SUB_MODE_REQUEST,
             entity_name = 'FP Operation Sub Mode',
-            override_text = new_mode_enum.name,
+            override_text = new_sub_mode_enum.name,
             logger = self.logger,
             can_interface = self.can_interface)