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Absolute encoder fault :F31120

Created by: Red_Strar at: 10/12/2013 4:03 PM (4 Replies)

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10/12/2013 4:03 PM	Rate (0)
Red_Strar Regular Member Joined: 3/22/2013 Last visit: 4/21/2021 Posts: 12 Rating: (0)	When I use an absolute encoder in a D410 project,the F31120 comes out once being powered on.The fault value is :1 bin.And the r949.0=1(Bit 0: Undervoltage condition on the sense line.).The encoder is from heidenhain.and there is a SMC20. I do not know the reason,I have checked the cable and the socket. I also want to know what is the "sense line"? In the SMC20 encoder interface, what is the difference between"Power for encoder" and "power for sense"?

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10/15/2013 10:03 AM	Rate (2)
Technology Team Platinum Expert Joined: 10/11/2006 Last visit: 11/22/2024 Posts: 5945 Rating: (816)	Hello, if your encoder has no sense contacts, you have to bridge the sense terminal at the SMC20. Pin 1 to Pin 14 Pin2 to Pin 16 8.5.2.3 X520 encoder system interface http://support.automation.siemens.com/WW/view/en/68040800 A controller compares the encoder system supply voltage - sensed via the Remote Sense cables - with the reference supply voltage of the encoder system, and adjusts the supply voltage for the encoder system at the output of the sensor module until the required supply voltage is obtained directly at the encoder system (only for 5 V encoder system power supply).
	With best regards, Technology Team Application consulting and pre sales support for SINAMICS, SIMATIC Technology, SIMOTION, SIMOTICS and MOTION CONNECT
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10/22/2013 4:39 AM	Rate (1)
RyanG Member Joined: 2/5/2010 Last visit: 11/23/2023 Posts: 2 Rating: (1)	Red_Strar When I use an absolute encoder in a D410 project,the F31120 comes out once being powered on.The fault value is :1 bin.And the r949.0=1(Bit 0: Undervoltage condition on the sense line.).The encoder is from heidenhain.and there is a SMC20. I do not know the reason,I have checked the cable and the socket. I also want to know what is the "sense line"? In the SMC20 encoder interface, what is the difference between"Power for encoder" and "power for sense"? F31120 means the SMC20 cannot detect the Power supply of the encoder by the sense line. for example, if the encoder isshort circuit, the power supply 5V may drop to 1V maybe. then the F31120 will show. what is the "sense line"? there are two wires in the encoder cable named "P5 sense" and "M sense". they are used to check weather the power supply is ok on the end of the encoder side.

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10/25/2013 4:09 AM	Rate (0)
Red_Strar Regular Member Joined: 3/22/2013 Last visit: 4/21/2021 Posts: 12 Rating: (0)	Thak you very much.

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4/7/2023 8:13 AM	Rate (0)
ozturkm Advanced Member Joined: 5/3/2013 Last visit: 11/22/2024 Posts: 57 Rating: (0)	Thank you very much for solution that helps a lot. Also we had same alarm(F31120) with incremental encoder (ern1387) with smc20. We measured this point and the supply voltage dropped because of wrong cable. We changed it with fit than the system turned to ok.

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