PLC configuration _ no input signals received

[RedOne]

Hello all,

I am using an L40 PLC, and I have the problem that I don't receive the inputs signals, but when I force the outputs signals, I can see the signals comming on the module. Do you know what can be the issue, that I don't see the inputs signals on the PLC configuation ? 

Thank you!

[Thorsten_Brach · Accepted solution]

Are the inputs used/called in your program ? ( Normally the I/Os are only updated, when they are used/called  )

Or you must activate the "Update unused I/Os" option in the target settings :

[RedOne]

Thanks, this solution helped. I don't understand do, why I had to check this, because the IO's were used.