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Modbus cable connection help

Created by: daad at: 2/25/2014 8:20 AM (7 Replies)

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2/25/2014 8:20 AM	Rate (0)
daad Gold Member Joined: 10/31/2011 Last visit: 4/8/2025 Posts: 400 Rating: (5)	Dear All, I want to communicate drive with s7200 on Modbus protocol and the drive connections are given below but which pins of port 0 used for modbus communication. Is there any requirement of logical common pion to GND pin of drive. Attachment Modbus cable.jpg (306 Downloads)

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2/25/2014 8:45 AM	Rate (0)
daad Gold Member Joined: 10/31/2011 Last visit: 4/8/2025 Posts: 400 Rating: (5)	Plz also confirm how to select stop bit (1 or 2) in S7200 side.

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2/25/2014 9:36 AM	Rate (0)
Marcjan Diamond Member Joined: 4/22/2010 Last visit: 3/31/2025 Posts: 5697 Rating: (716)	Hello, Please download the S7-200 system manual. You will not only find the connector pinout but also a chapter about Modbus communication. You can also use the search to read more about S7-200 and modbus. 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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2/25/2014 9:46 AM	Rate (0)
daad Gold Member Joined: 10/31/2011 Last visit: 4/8/2025 Posts: 400 Rating: (5)	Dear Marcjan, I have read about modbus in sys manual but its only identify pinout of port not for specific modbus configuration.

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2/25/2014 9:53 AM	Rate (0)
Ste39 Posts: 4620 Rating: (710)	Hi daad, Have you already seen this: MODBUS communication with S7-200
Ste39 Posts: 4620 Rating: (710)
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2/25/2014 9:53 AM	Rate (0)
Marcjan Diamond Member Joined: 4/22/2010 Last visit: 3/31/2025 Posts: 5697 Rating: (716)	Hello, How do you implement MODBUS communication with S7-200? You will need the Modbus library. Regards, Marcjan
	Last edited by: Marcjan at: 2/25/2014 9:55 AM Same link :-) Problem solved? Please let us know! Please no technical questions by PM, use the forum sections for your questions.
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2/25/2014 10:01 AM	Rate (0)
daad Gold Member Joined: 10/31/2011 Last visit: 4/8/2025 Posts: 400 Rating: (5)	Dear Marcjan, I have modbus library and apply program as per manual but communication error of "MBUS_MSG" block is "3".

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2/25/2014 10:37 AM	Rate (0)
Marcjan Diamond Member Joined: 4/22/2010 Last visit: 3/31/2025 Posts: 5697 Rating: (716)	Hello, Receive timeout: There was no response from the slave within the Timeout time. Some possible causes are bad electrical connection to the slave device, master and slave are set to a different baud rate / parity setting, and incorrect slave address. 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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This contribution was helpful to 1 thankful Users daad

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