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

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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);