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wiring Open Collector type digital Input

Created by: pesa2k at: 6/2/2008 1:27 PM (4 Replies)

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6/2/2008 1:27 PM	Rate (0)
pesa2k Regular Member Joined: 10/16/2006 Last visit: 7/20/2020 Posts: 11 Rating: (1)	Dear All, I am facing some difficulties in connecting an Open Collector type digital Input to CPU224 built in IO cards. Digital input modules are wired for sink type. I have tried to connect a pullup resistor of 10k Ohm between the "Open-collector" and Vcc(+24V), and then connecting the open-collector terminal to PLC I0.0 terminal. But this wiring is not sensing the active state in the circuit. Is it possible to connect open collector input to CPU 224? Can anybody help me to correct the wiring scheme. P.S: All DI's in the module are working when testing individually Thanks, Samy
	Last edited by: pesa2k at: 6/2/2008 1:34 PM
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6/2/2008 2:41 PM	Rate (0)
Ayman Elotaify Platinum Expert Joined: 5/28/2008 Last visit: 3/3/2021 Posts: 4206 Rating: (791)	Find here attached a data sheet of S7-200 for all CPUs 224 of how to wire I/Os. I hope it will meet your requirements. Attachment S7-200_e.pdf (421 Downloads)
	Ayman Elotaify
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6/2/2008 3:37 PM	Rate (0)
pesa2k Regular Member Joined: 10/16/2006 Last visit: 7/20/2020 Posts: 11 Rating: (1)	Dear Ayman. Thanks for the information. Actually I need wiring details specific to Open Collector type signals. I have a Low Voltage monitoring relay (Solid state type) which gives out alarms in Open collector type terminals. I was advised to use pullup resistor to Vcc and then connect to Digital input. But it doesn't seem to work. So I need some more information about connecting to this open collector type signals to CPU 224.

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6/2/2008 4:36 PM	Rate (0)
Ayman Elotaify Platinum Expert Joined: 5/28/2008 Last visit: 3/3/2021 Posts: 4206 Rating: (791)	Can you upload a datasheet for this type or relays and may I can help you
	Ayman Elotaify
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6/2/2008 5:14 PM	Rate (0)
Ayman Elotaify Platinum Expert Joined: 5/28/2008 Last visit: 3/3/2021 Posts: 4206 Rating: (791)	Actually if possible send a data sheet of your solid state relay, I want to know some values from data sheet. 1. The maximum allawable applied voltage accross open collector output transistor. 2. The maximum allawable sinking current through open collector output transistor.
	Ayman Elotaify
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