SLC 500 analog output voltage setup

Cailong Bao · 25 Dec 2016

Hi, everyone. I hope your experts can help me on this. I have a SLC 500 with 5/03, 1746-IB16 and 1746-NO4V.

I like to use a switch to input in 1746-IB16 channel 1. Once that switch is on, I want 1746-NO4V channel 1 outputs

a voltage say 2.5 V. I can modify the OUTPUT File to output that voltage, but not safe for running the program.

Is it possible to use a digital input to generate a voltage output from an analog output module? If that is possible,

what kind of function I have to use in the program? Thanks a lot.

Mickey · 26 Dec 2016

Yes it is possible.

If your digital input is true then move a value of 8191 to the output word of your analog output card. This gives you 2.5 volts

Use a "XIC" instruction (address is your digital input) and a "MOV" instruction for this. When digital input is on (true).

Use a "XIO" instruction (address is your digital input) and a "MOV" instruction to move a value of zero (0) to the output word when the

digital input is off (false). This gives you 0 volts.

Edited 26 Dec 2016 by Mickey

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