How to quickly test a Power-io IO-IAC Module, using a AC Source, a 9 volt battery and a meter.

IO-IAC-280-N or -P generates a logic signal on terminal 4 that is often wired to a PLC's input. The PLC's power supply is wired to terminals 3 and 5.

The "-N" model produces a logic signal that is negative compared to the input. (If a field device input exists, no output exists). The "-P" model produces a logic signal that is positive compared to the input. (If a field device input exists, an output exists).

When terminal 4 is at 0 volts, it can be used as a sinking signal, at up to 100mA. This is the most common way of using the I/O module. When terminal 4 is "high", then it can be used as a sourcing signal but the mA capability will be limited to a few mA maximum.

When a control input signal is present on terminals 1 and 2, the logic signal on terminal 4 changes state, and a green LED activates.

If the LED is ever red in color, the + and - polarity is probably mis-wired at terminals 3 and 5.

Sourcing? Sinking? Here is a quick example of using a sinking signal from an IO module to activate an external product: appnotes/io-module-sinking-example.htm

Sourcing? Sinking? Here is a quick explanation from the internet: http://www.patchn.com

When installed in your application, the Power-io IO modules might be used like this:

The modules can be intermixed as input IO modules and output IO modules: