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S7-1200 Modbus TCP problem 502 port

Created by: romibrat at: 4/4/2019 11:04 AM (4 Replies)

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4/4/2019 11:04 AM	Rate (0)
romibrat Advanced Member Joined: 1/18/2018 Last visit: 11/3/2025 Posts: 21 Rating: (0)	Hi there I'm having problem to read data from S7-1200 with modbus TCP. It's like port 502 not working correct. I used the siemens official example https://support.industry.siemens.com/cs/ww/en/view/102020340 and even found on youtube example https://www.youtube.com/watch?v=eeZ8btlq2zk I did exactly everything the same but not working. I wan't that my S7-1200 work as Server (slave) for 3rd party devices. But with medford and Modbus poll tools can't red any coils,input registers, holding registers... TIA version: V14 SP1 Update 6 PLC. S7-1215 ... 215-1AG40-0XB0 with firmware V4.2.2 MB_Server block with 4.1 version ... tried with 4.0 also ... Did anyone had similar problem? MB Server modbus parameters are simple ... look attachment ... my laptop IP is set on 192.168.127.200 put/get on PLC is checked and have full accsess On status message of MB_Server block is 7002 What am I missing? Is it firmware problem? Do I need to install something additional? GSD files or something else ... Attachment ModbusData.JPG (771 Downloads)
	Last edited by: Jen_Moderator at: 4/4/2019 2:44:34 PM Optimized link.
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4/4/2019 11:17 AM	Rate (0)
Jay. Posts: 1283 Rating: (105)	If you don't mind, can you share the online version of the same block? and also MB server block is there any error code?
Jay. Posts: 1283 Rating: (105)
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4/4/2019 1:06 PM	Rate (0)
Kaulquappe Posts: 3093 Rating: (324)	Hello romibrat, wthen the S7 acts as Modbus server usually an unspecified connection is used. That means that you do NOT define remote IP address and remote port. Regards, Kaulquappe
Kaulquappe Posts: 3093 Rating: (324)
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4/4/2019 1:07 PM	Rate (0)
romibrat Advanced Member Joined: 1/18/2018 Last visit: 11/3/2025 Posts: 21 Rating: (0)	No errors ...

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4/4/2019 1:19 PM	Rate (0)
romibrat Advanced Member Joined: 1/18/2018 Last visit: 11/3/2025 Posts: 21 Rating: (0)	Tnx ... That solved the problem ... I put all zero's of IP and it worked ... But don't understand how the hell this worked for this guy ... https://www.youtube.com/watch?v=eeZ8btlq2zk I even using same scan tool ... same software ... And this guy enered his IP ...

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This contribution was helpful to 1 thankful Users Kaulquappe

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