How to use Data Mask to extract Health Bit from individual devices with BMXNOE0100

There is a built in health bit in NOE module. Below FAQ give you the detail:
FAQ: What is the I/O scanning health bit address for a M340 NOE module
https://www.se.com/au/en/faqs/FA240970/

However the health bit is a INT variable, it is necessary to code a data mask to pick out those bits variable from Int variable.

The health variable (IW0.1.0.1) is a Int type, it contains the health bit information from device 1-15.  Below table shows the relationship in between Decimal value and a Binary value.

Decimal  Binary   Bits
1              0001     bit 0
2              0010     bit 1
3              0100     bit 2
4              0011     bit 0 + bit 1

So if you get your health variable = 1 in Int, you know your binary is 0001, which means your 1st device is healthy. if you get your health variable = 2, you know your binary is 0010, which means your 2nd device is healthy. If you get health variable = 4, you know your binary is 0011, which means your 1st and 2nd device is healthy.

To extract those bit information out of a INT in your logic, you usually need to code a data mask. A data mask is a number used to pick out (test) specific bits inside a WORD / INT / BYTE. Below is a simple example in ST.

Device_1 := (Health_Variable_INT AND 1) <> 0;  // bit 0
Device_2 := ((Health_Variable_INT AND 2) <> 0;  // bit 1
Device_3 := ((Health_Variable_INT AND 4) <> 0;  // bit 2

Released for: Schneider Electric New Zealand