5/15/2014 9:11 PM | |
Joined: 4/22/2010 Last visit: 5/3/2024 Posts: 5697 Rating: (715)
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Hello, Have a look at attached document. Regards, Marcjan Attachmentpinout_CP_and S7_200.pdf (390 Downloads) |
Problem solved? |
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5/16/2014 3:22 PM | |
Joined: 11/21/2007 Last visit: 8/12/2024 Posts: 2325 Rating: (308) |
Any perticular reason for using Modbus communication between two Siemens Systems. You can easily have MPI communication between the S7-400 and S7-200 . Just Check : How does data communication work between S7-300/S7- 400 and S7-200 via MPI using S7 basic communication? Modbus is neither a native protocol of S7-200 nor S7-400. You can load modbus library for S7-200 and buy an expensive Modbus library for CP341. The MPI connection is free ( and easier to implement than Modbus ) You can also establish a Profibus Connection ( Much faster than Modbus ) by just using a EM277 on S7-200 side . Just Check :How can you communicate data between the S7-200 and the S7-300 via PROFIBUS DP?Hope this helps Cheers Navnag |
Last edited by: Navnag at: 5/16/2014 3:28 PMThere is no such thing as the last bug in a program |
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This contribution was helpful to1 thankful Users |
5/18/2014 9:16 AM | |
Joined: 11/21/2007 Last visit: 8/12/2024 Posts: 2325 Rating: (308) |
Hello baker.ajmal As per the CP 341 Manual ( Pl see attached Extract ) The Resistance value should be 330 Ohms As per S7-200 manual a 220 Ohm restance is used. We normally use 330 Ohm 1/2W resistance without any problems. Hope this helps Cheers Navnag AttachmentRS485_Cable.zip (336 Downloads) |
There is no such thing as the last bug in a program |
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This contribution was helpful to1 thankful Users |
5/18/2014 3:01 PM | |
Posts: 559 Rating: (87) |
Please find attached copies of sample programs for S7-200 as well as S7-300 PLC. Here S7-300 is modbus Master & S7-200 Modbus Slave. AttachmentS7-300 Modbus_Master.zip (327 Downloads) |
5/18/2014 3:02 PM | |
Posts: 559 Rating: (87) |
Please find the S7-200 PLC As a modbus slave program.
AttachmentS7 200 modbus slave.zip (331 Downloads) |
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