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Communication issue with S7-1200

Created by: jmckenzie86 at: 1/12/2016 5:57 AM (5 Replies)

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1/12/2016 5:57 AM	Rate (0)
jmckenzie86 Experienced Member Joined: 4/28/2015 Last visit: 11/18/2024 Posts: 2 Rating: (0)	I'm having a similar problem with an S7-1200 PLC, in particular: Normal 0 false false false EN-GB X-NONE X-NONE MicrosoftInternetExplorer4 CPU 1214C DC/DC/DC, 6ES7 214-1AE30-0XB0, FW=V2.2 When I power up the system I can see the RUN/STOP & ERROR LEDs along with all the digital output LEDs flashing at a very high frequency. Also all LEDs are much dimmer than I usually see. I powered off the system, installed the MMC and powered back on the system but that nothing has changed. I cannot communicate with the PLC via ethernet connection (tried two separate ethernet cables). The local area connection in windows shows ‘network cable unplugged’ indicating no comms available. At the PLC next to the ethernet connection I can see no LEDs illuminated, suggesting there is an issue with the PLC. I know there's no issue with the ethernet port of my laptop as I was using it with another PLC recently. I done the usual checks like setting a static IP address etc. I measured 23.25V across the M and L+ terminals at the PLC 24V input. The PLC requires 24V to operate but I’d imagine that 23.25V would be sufficient. can anyone confirm this? 23.25V was measured at the same terminals to all I/O modules also. I powered off the system, disconnected all I/O and comms modules to the PLC then powered back on the system. This test was to isolate the fault to the PLC. There is no change in the state of LEDs or ethernet communications, so it could well be a faulty PLC. Does anyone have an idea how I could resolve this issue as it's put a stop to commissioning a system on site ------------------------------------------------------------------------------------------ Split from CPU S7 1200 Led STOP/RUN constantly flashing.
	Last edited by: Min_Moderator at: 1/12/2016 9:46:13 AM New subject after splitting
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1/12/2016 8:40 AM	Rate (0)
mopS04 Platinum Expert Joined: 3/5/2014 Last visit: 8/5/2022 Posts: 5521 Rating: (1054)	hi, 23,25V should be enough to run the PLC. Can you go online to another PLC? If yes, there is a problem with the PLC If nothing is connected to the S7-1200 and you can not go online to it, I would contact Siemens direcly. regards,
	FCK WAR! Be nice!
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1/12/2016 10:04 AM	Rate (0)
Towome Platinum Expert Joined: 7/9/2015 Last visit: 1/23/2025 Posts: 4121 Rating: (620)	Hi, did you try to reset your s7-1200 to factory settings? You can do this without PLC. Please try this FAQ: How can you delete the IP address and reset your S7-1200 to factory settings using the SIMATIC MC memory card (2MB or 24MB)? https://support.industry.siemens.com/cs/ww/en/view/40588092 Good luck, Towome
	If my post was useful, please rate me - if not, please tell me - thank you!
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1/12/2016 10:27 AM	Rate (0)
mopS04 Platinum Expert Joined: 3/5/2014 Last visit: 8/5/2022 Posts: 5521 Rating: (1054)	hi together, I wonder that this is possible, because the manual says that it is neccessary that the S7-1200 is online available. And the manual is from 01/15, the FAQ from 2012. I expect that if it is possible to reset to factory settings without going online to the PLC, the manual should be conform with it. regards,
	FCK WAR! Be nice!
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1/12/2016 10:38 AM	Rate (1)
Duris_I Diamond Member Joined: 4/28/2015 Last visit: 1/20/2025 Posts: 10759 Rating: (835)	Hello all, I will be try connect that CPU to another Power supply, just for test to exclude CPU failure. Maybe current value is not enough. This is first what it must be, I think.
	With best regards... Ivan Duris Flight: OMICO
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1/12/2016 11:57 AM	Rate (0)
mopS04 Platinum Expert Joined: 3/5/2014 Last visit: 8/5/2022 Posts: 5521 Rating: (1054)	Duris_I Hello all, I will be try connect that CPU to another Power supply, just for test to exclude CPU failure. Maybe current value is not enough. This is first what it must be, I think. good idea, duris! not enough current could also be a reason. and there could be such errors when the voltage is not "clean" like a pulsed direct voltage. regards,
	FCK WAR! Be nice!
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