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Old April 8th, 2016, 02:40 PM   #1
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ecampos is offline
Join Date: Jan 2016
Location: PA
Posts: 24
Wiring encoder output to PLC

I have few existing machines with Omron PLCs in them that I need to get the output from an encoder into. There are several output options available for the encoder I am looking at and I am not sure which is best for my application. Attached is a screenshot from the wiring guide for the encoder. I have never dealt with "open collector" outputs before.

The way this diagram reads to me is that if I want to get my encoder output into a "sinking" (0V common) input card on my PLC, I need to order the open collector output option and tie my input to +24V through a resistor, or order the pull-up resistor output and I can connect the encoder output directly to my PLC input. Am I correct that either of these options are viable? Is there any functional difference or benefit to using one or the other of these output options?
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File Type: jpg encoder output.jpg (31.4 KB, 54 views)
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Old April 8th, 2016, 02:58 PM   #2
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BITS N BYTES is offline
Join Date: Jun 2005
Location: Miami Beach
Posts: 438
Attachment shows wiring for model CP1L PLC with Open Collector Encoder. This model has built-in high speed inputs suitable for reading encoder pulses.
For other models you will need a high-speed counter module to capture encoder data.
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File Type: pdf TYPICAL Open Collector Wiring OMRON CP1L.pdf (25.9 KB, 50 views)
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