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$551@2 not possible in S7-200 PLC

5/14/2011 9:59 AM	Rate (0)
Gaurav_79 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
Gaurav_79 Posts: 33 Rating: (1)
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5/16/2011 8:54 AM	Rate (0)
Marcjan Diamond Member Joined: 4/22/2010 Last visit: 3/31/2025 Posts: 5697 Rating: (716)	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 Posts: 33 Rating: (1)	I am using OP3 display
Gaurav_79 Posts: 33 Rating: (1)
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5/17/2011 11:29 AM	Rate (0)
Marcjan Diamond Member Joined: 4/22/2010 Last visit: 3/31/2025 Posts: 5697 Rating: (716)	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 Grandmaster Joined: 3/21/2006 Last visit: 1/10/2026 Posts: 10247 Rating: (1183)	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 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
Gaurav_79 Posts: 33 Rating: (1)
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This contribution was helpful to 2 thankful Users umencho Marcjan

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