Hello everyone:

I have been working on my logic for a while, and the team I am working with would like to test it on our scaled down test-setup soon. Before we go ahead and do that, I need to figure out something.
As a condition of the system being OK, "power availability" of the input and output devices is required. However, these devices (pressure probe, magnetic pickup probe, ...) don't actually have an additional signal which would tell the PLC that they are sending info, they just simply send information (i.e. voltage spikes for the RPM probe).

So, what I did (and this approach is completely unverified, since it just seems to make sense), I set the Local:1:0:0 Status (instead of Data) as XIO.

Will that work with the PLC, or am I just completely messing up my logic?? Will I essentially have to just take the input values the PLC is receiving, and if they are greater than 0 (for example) say that the devices have power?

Thanks a lot for any help! Jan

I don't think I am quite understanding you. You are trying to verify that you have power to the Inputs and Outputs? Connect a wire unconditionally from the I/O power to a spare input and address Local:X.I.Data.Y?

Is this what you are asking?

No, if I understand you correctly, then I think no. Essentially, what I am trying to provide is another alarm functionality for the PLC. Lets say I have a pressure probe transferring the current pressure of a torque transfer assembly. However, the pressure probe has only one wire running to the PLC, the wire that directly sends the pressure reading.

What I am trying to do is use this wire as an indicator of power to the pressure probe. Thus, I "said", that if the Status Local:X:I:Data is "on", the probe has power.

What I am asking is: Is that a correct logic, or will it fail completely during testing (lets say for example, because to really check the status I have to see if a value is being provided and is greater than lets say 0)?

I hope that better explains it.

Jan