Siemens analog input not reading

[bb76]

I am setting up a new system and have an s7 1214 plc with an sm1231 4x AI (6ES71231-4HD32-0XB0). It is configured for 0-10v and has no faults in diagnostics but the value always reads 0.

We are using another PLC analog output to test the AI so we know what is coming out and can measure it on the AI terminals. We have replaced the module with a spare and we have the same behaviour on that too.

Weirdly if we move the input to the AI on the cpu it reads as expected so this proves the test PLC output side of things. I've also tried several HW downloads with no effect.

One thing I've just thought of as I'm typing is to delete the module and re-add to the project to see if that helps.

Other than that does anyone have any ideas or spot the obvious mistake I'm missing?

TIA (Thanks in Advance!)

 

[Ken Moore]

In the hardware setup, is the channel enabled?

 

[Rob...]

How have you wired the module? You haven't missed the 0v ommon have you? I see this often.

 

[Puddle]

How is it wired? The SM1231 needs 24v connecting to the L and M terminals.

Other than that, I think a firmware mis-match would show an error when you download.

It's possible to turn off the input in the hardware setup or set conditions on when it is called. You can directly address it using the suffix "" (e.g rather than %IW15, it would be %IW15) to get around this.

 

[bb76]

It's possible to turn off the input in the hardware setup or set conditions on when it is called. You can directly address it using the suffix "" (e.g rather than %IW15, it would be %IW15) to get around this.

It's wired correctly. I've been playing around since I posted earlier and found channel 3 seems to work ok and I can address all channels via "" so it seems the like the channels need activating as you suggest.

Where can I find this option as I've gone through the HW config a few times and not noticed it?

 

[Puddle]

I may be wrong about that, I don't have TIA in front of me so I can't check. I know you can disable channels on a 1500 and ET200 so I was assuming you can on a 1200.