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Outputs not working after adding expansion module.

Created by: Chris12345678 at: 5/10/2019 12:13 AM (7 Replies)

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5/10/2019 12:13 AM	Rate (0)
Chris12345678 Posts: 99 Rating: (2)	Evening, after adding an expansion module SM 1223 DC/DC to a 1212C AC/DC/Relay, the outputs on the PLC have stopped working, but are fine on the expansion module? Is this something simple I have missed? Thanks.
Chris12345678 Posts: 99 Rating: (2)
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5/10/2019 1:33 AM	Rate (0)
0_Einstein Grandmaster-Expert Joined: 7/7/2010 Last visit: 12/23/2025 Posts: 16325 Rating: (2520)	When you say "stopped working", do you mean the LEDs light up and the relay outputs do not change state? Did a fuse blow that powers the relay outputs? Chris12345678 Evening, after adding an expansion module SM 1223 DC/DC to a 1212C AC/DC/Relay, the outputs on the PLC have stopped working, but are fine on the expansion module? Is this something simple I have missed? Thanks.
	science guy
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5/10/2019 1:36 AM	Rate (0)
Chris12345678 Posts: 99 Rating: (2)	The lights don’t come on at all! Do you mean a fuse inside the Plc?
Chris12345678 Posts: 99 Rating: (2)	Last edited by: Chris12345678 at: 05/10/2019 01:37:06
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5/10/2019 1:54 AM	Rate (0)
0_Einstein Grandmaster-Expert Joined: 7/7/2010 Last visit: 12/23/2025 Posts: 16325 Rating: (2520)	If you are certain the PLC outputs are being turned on in the PLC logic, the PLC logic is running, and the LEDs are not lighting up for the dig outs, then is it possible you added the expansion module while the plc had power applied? Chris12345678 The lights don’t come on at all! Do you mean a fuse inside the Plc?
	science guy
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5/10/2019 7:05 AM	Rate (0)
Chris12345678 Posts: 99 Rating: (2)	No, it was off when it was added. It was working after the module was fitted. However the module wasn’t added into the program straight away, and I think it it was when it was added into the program that it stopped working, but I’m not 100%.
Chris12345678 Posts: 99 Rating: (2)	Last edited by: Chris12345678 at: 05/10/2019 07:15:53
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5/10/2019 7:32 AM	Rate (0)
mopS04 Posts: 5521 Rating: (1058)	hi Chris, can you share more information, please? How did you wire the CPU? Is any kind of diagnostic available in TIA? the more we know, the more we can help, regards
mopS04 Posts: 5521 Rating: (1058)
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5/10/2019 8:06 AM	Rate (0)
Chris12345678 Posts: 99 Rating: (2)	Hi, it only has the live, neutral and earth connected. It has never had anything connected to the output. I’m new to PLC’s so am still learning to program it. The last time the outputs were working, it was being controlled from a KTP400 HMI, with no inputs connected. There are no errors at all in TIA Thanks, Chris
Chris12345678 Posts: 99 Rating: (2)
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5/13/2019 8:24 PM	Rate (0)
Chris12345678 Posts: 99 Rating: (2)	This has mysteriously started working again, no idea what it was!
Chris12345678 Posts: 99 Rating: (2)
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