Temp_UM parameter is inaccessible from Programming and Display on TM172
I am setting up user configurable temperature and pressure unit support on a TM172DCLWTHP via EcoStruxure Machine Expert - HVAC.
I'm looking at changing the 'Temp_UM' parameter to change the on-board temperature reading and the sensor reading is directly tied to an edit box on the HMI. I have tried to write to it using the parameter link 'sysPar_Temp_UM' and the parameter name directly (Temp_UM) but I am receive no change in sensor values. I can change Temp_UM via Commissioning and it works just fine in changing unit type and the displayed value, and I can successfully read from sysPar_Temp_UM' in Programming.
During compile, I receive errors such as the following (when using sysPar_Temp_UM in Programming);
PROGRAM_MAIN(41) - error G0008: ST => Invalid access to variable
Or when I attempt using 'Temp_UM' in Programming;
PROGRAM_MAIN(39) - error A4097: TEMP_UM => Object not found
How do I go about fixing this so that I have access to 'Temp_UM'?