Search FAQs

How to identify the M172 that I am using in the program?

In order to identify in our code which M172 model we are using we need to use the two (2) internal variables located in "Operators and blocks".
The variables are Par_POLI (Polycarbonate code) and sysMSK (Mask number).

If a M172 with 28IOs or 42IOs is connected then the variable "sysMSK" is equal to 596  then bits of "Par_POLI" help us to identify the model:
BIT1   BIT0   CONTROLLER
0       0       Undefined
0       1       28IOs
1       0       Undefined
1       1       42IOs

If a M172 with 07IOs or 18IOs is connected then the variable "sysMSK" is equal to 668 then bits of "Par_POLI" help us to identify the model:
BIT1   BIT0   CONTROLLER
0       0       Undefined
0       1       07IOs
1       0       Undefined
1       1       18IOs

So we can create the following logic on EcoStruxure Machine Expert HVAC in ST logic:

In the local variables
VAR
xIND_M172_07_IOs : BOOL;
xIND_M172_18_IOs : BOOL;
xIND_M172_28_IOs : BOOL;
xIND_M172_42_IOs : BOOL;
END_VAR

xIND_M172_07_IOs FALSE    :=   Par_POLI.0    AND NOT Par_POLI.1   AND       (sysMSK =   668);
xIND_M172_18_IOs TRUE     :=   Par_POLI.0    AND    Par_POLI.1   AND       (sysMSK =   668);
xIND_M172_28_IOs FALSE    :=   Par_POLI.0    AND NOT Par_POLI.1   AND       (sysMSK =   596);
xIND_M172_42_IOs FALSE    :=   Par_POLI.0    AND    Par_POLI.1   AND       (sysMSK =   596);