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$551@2 not possible in S7-200 PLC

Created by: Gaurav_79 at: 5/14/2011 9:59 AM (5 Replies)

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5/14/2011 9:59 AM	Rate (0)
Gaurav_79 Regular Member Joined: 2/19/2010 Last visit: 3/2/2019 Posts: 33 Rating: (1)	Hi, We have S7-200 PLC in our plant having CPU 216-2. Since last few days, we are facing a problem. A message saying '$551@2 not possible' being displayed on HMI and machine stops. After some time alarm resets automatically. Problem could not be identified. Please help, Regards, GAURAV TRIPATHI

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5/16/2011 8:54 AM	Rate (0)
Marcjan Platinum Expert Joined: 4/22/2010 Last visit: 8/22/2019 Posts: 5564 Rating: (659)	The message means (for some HMI ) the communication with cpu is lost (for a moment), check your wiring and adresses. What HMI you use ? Best regards, Marcjan
	Problem solved? Please let us know! Please no technical questions by PM, use the forum sections for your questions.
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5/16/2011 9:26 AM	Rate (0)
Gaurav_79 Regular Member Joined: 2/19/2010 Last visit: 3/2/2019 Posts: 33 Rating: (1)	I am using OP3 display

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5/17/2011 11:29 AM	Rate (0)
Marcjan Platinum Expert Joined: 4/22/2010 Last visit: 8/22/2019 Posts: 5564 Rating: (659)	That error is not in the OP3 manual, i only found one thread about error 551 (op7) and as i wrote before that was a communication problem, check all the settings and cable. Best regards, Marcjan
	Problem solved? Please let us know! Please no technical questions by PM, use the forum sections for your questions.
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5/17/2011 12:33 PM	Rate (0)
UMENCHO Diamond Member Joined: 3/21/2006 Last visit: 11/20/2019 Posts: 10195 Rating: (1147)	Hello, If the cable and settings are OK, replace the panel with new one. Best regards, Hristo Mihalev

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5/17/2011 2:52 PM	Rate (0)
Gaurav_79 Regular Member Joined: 2/19/2010 Last visit: 3/2/2019 Posts: 33 Rating: (1)	Thanks for your suggestions. We interchanged the CPU with another machine, and found it is creating problem. So.... we have lost a costly CPU. Gaurav

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This contribution was helpful to 2 thankful Users UMENCHO Marcjan

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