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As you can see from the above diagram, the overall circuit did not change much from the
previous example. Here’s how it works.
A 120 AC Live voltage is input at TB1-11. When an alarm is triggered that voltage is output to
TB1-12 and sent to Control Relay at CR-A. This energizes the relay CR because a 120VAC
Neutral is input at CR-B, thus completing the circuit. When the relay energizes, it closes the
normally-open contact pairs CR-6 / CR-9 and CR-4 / CR-7. This allows current to flow through
the lamp, and also the output of the PLC I/O module is returned to the negative terminal, thereby
completing both circuits
Note that the PLC I/O module is a DC voltage type. Using the relay gives you the flexibility to use
different voltages from a single alarm output.
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