White Paper: How to Connect HS35iQ Encoder Fault Output to a PLC
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Rev 1-9-2023-1
Software Setup
The routine written to read the fault output and turn on the LED is shown in Figure 2.
Figure 2. PLC software routine
An Examinine Off was used as the fault output is high during non-fault conditions and transitions to low when a
fault occurs. The routine simply reads the status of the fault output on
DC IN 0
and will energize
DC OUT 08
connected to the LED if a low condition is read.
Testing
After everything was connected properly, the program was downlaoded to the PLC and it was set to run mode.
To test proper functionality a cable fault was triggered by detaching the load resistor from one of the encoder
outputs (A/B/Z). The cable fault LED on the encoder transitions to
RED
at the same time the LED connected to
the PLC turns on (Figure 3). After the fault is corrected the cable fault LED on the encoder turns
GREEN
and
the LED on the PLC turns off (Figure 4).
Figure 3. PLC indicating active fault output
