Kegel FLEX 17-5801 Operator's Manual page 164

Inputs and Testing Continued...
Testing inputs is very simple, like the flick of a light switch. To test proximity sensors pass a
metal object across the face of any sensor. Lights on both the proximity sensor and PLC
Input should light up. To test inputs operated by switches, depress the lever on the switch
and the appropriate input should light up.
The following wiring drawings will show the simplest way a switch and proximity sensor
connect to the PLC.
Below is an example of a typical input circuit, using a switch. One side of the switch goes to
the PLC Input and the other side of the switch goes to Negative Voltage. The PLC Input
Common is supplied with Positive Voltage. The circuit is shown in the open position so
there will be no input light on the PLC. The batteries will supply the 24 Volts. All of the
machine switches are wired like this. The only difference is that the wires will pass though
plugs and junction blocks.
152