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Modbus TCP Connection problem

5/27/2014 4:34 PM	Rate (0)
Janson Posts: 12 Rating: (0)	Hi, I have problem with modbus TCP. I'm trying to connect a IM 151-8 to a P&R-plc (which I don't control). The IM 151-8 is client. The CONN_ESTABLISHED is "1" most of the time but is flashing regularly. The error_counter is counting up. If I remove TP-cable the CONN_ESTABLISHED is, of course, "0" all the time. It looks like I have some connection but not all the time. I can not see any values of any registers. The error code is A100, no other errors are shown. Anybody who has any idea of what is going on? Best regards, Sara J
Janson Posts: 12 Rating: (0)
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5/28/2014 9:56 AM	Rate (0)
Wüstenräuber Gold Expert Joined: 10/3/2008 Last visit: 10/22/2025 Posts: 996 Rating: (129)	Hi, I see 2 possibilities for such behaviour: 1. The communication partner breaks the connection. 2. There is an invalid telegram so that the modbus block breaks the connection and establishes it again. Write a telegram traffic with wireshark or soto check it. Wüstenräuber

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5/28/2014 10:22 AM	Rate (0)
Janson Posts: 12 Rating: (0)	Thank you! I will try that. /Sara J
Janson Posts: 12 Rating: (0)
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6/2/2014 10:41 AM	Rate (0)
Janson Posts: 12 Rating: (0)	The problem is solved. The parameter UNIT needed to be set to "1".
Janson Posts: 12 Rating: (0)
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This contribution was helpful to 1 thankful Users Kaulquappe

4/18/2015 9:47 AM	Rate (0)
CS Moderator Moderator Joined: 9/1/2005 Last visit: 10/31/2025 Posts: 4114 Rating: (195)	new question published by Mayyu is split to a seperate thread with the subject Modbus TCP Connection problem - error A100 in S7 as Server. Best regards CS Moderator
	My Forum is the place to personalize your profile, track your topics, and maintain content that interests you. Best regards CS Moderator
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6/15/2015 10:57 AM	Rate (0)
Min_Moderator Posts: 4758 Rating: (122)	New question published by @mer is split to a separate thread with the subject Periodic disconnect for 10min. Best regards Min_Moderator
Min_Moderator Posts: 4758 Rating: (122)
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