Posted 21 Feb 2018 Hi,newbie to OMRRON and trying to understand its hardware terminals ie COM, input and ouput. Cant seem to workout how the basic wiring is done in hardware. Any pointers/material much apperciated. Share this post Link to post Share on other sites
Posted 21 Feb 2018 This is a very broad question. Are you having trouble wiring the COM port, the Inputs or the Outputs? Is this a CPM1A or CPM2A? The programming manual is the same for both: Share this post Link to post Share on other sites
Posted 21 Feb 2018 You are looking for the Operation Manual of the unit. This will show you the wiring diagrams. Here is the one for the CPM1A:https://assets.omron.eu/downloads/manual/en/w317_cpm1a_operation_manual_en.pdf Section 3 - Installation and Wiring Note: The Programming manuals will have the information for the instructions. Regards, Garry Share this post Link to post Share on other sites
Posted 21 Feb 2018 1 hour ago, IO_Rack said: This is a very broad question. Are you having trouble wiring the COM port, the Inputs or the Outputs? Is this a CPM1A or CPM2A? The programming manual is the same for both: Yes its a CPM2A and need to understand how Input and output work. Eg, is COM always negative? and how does sensor work work with this unit, ie do we supply 24v+ and -, and then return wire back to input..just get confused and confused. Share this post Link to post Share on other sites
Posted 21 Feb 2018 The COM point refers to a common point for the discrete input signal. It can be either negative or positive in this Omron controller. Refer to the wiring diagrams in the manuals above. Here is some wiring examples:http://accautomation.ca/heres-a-quick-way-to-wire-npn-and-pnp-devices/ Regards, Garry Share this post Link to post Share on other sites