NE_INT on array value

[Anonymous user]

I am trying to set an error flag based on the GEST parameter of READ_VAR.

The array PT1_RX1_ST is the input GEST on a READ_VAR block.

The index 1 of the array points the report (0 = no error)

The index 3 of the array points to the length of the response (expecting length = 4)

If I unplug the cable to the remote device, we see the first NE_INT fails (7 != 0, but the output is false)

The second NE_INT block seems to work properly. How can I fix this ?? (I'm new to Schneider PLC)

I'm using M340, the remote device is a M221

Thanks!

I also tried to give the GEST a direct memory address %MW200 and read values %MW201 and %MW203.

%MW201 is always 0, %MW203 seems to update properly

[DavidBaker]

Did you ever resolve this?

[Anonymous user]

@DavidBaker @Nope not resolved, so far no help on the forums....

[DavidBaker]

Odd.  The logic works on my PLC.  What version of Unity?

[Anonymous user]

@DavidBaker Ecostruxure Control Expert V14.1 - 191122A

Would you mind sharing your working program?

[DavidBaker]

Mine is for M580.  I'll take a quick look at yours.  Export and attach.  

[Anonymous user]

@DavidBaker Thanks any help is appreciated.

See program "Gestion_PTR" : https://we.tl/t-Q4u0jdD42O  

[FrancisBreysach]

Hello

If the problem is always present,

As a workaround,

you could try to invert the logic of the test: 

EQ_INT and then invert the input (on the OR_BOOL) with a Not (little circle).

[DavidBaker]

You are running your Read_Var continuously (directly from the Power Rail).  The Value of 7 is actually toggling between 7 and 0 so fast that you can't see it.  So it only looks like the logic is not working properly.  I proved this by adding a contact in front of your Read_Var., then disabled the rung after remove the ethernet cable.

You will want to use logic to control execution of the Read_Var.  I use a Pulse Input to execute the Read_Var.