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S7-1200 CB1241 Modbus communication with Teco Servo Drive
Created by: pakplc at: 5/27/2015 7:48 PM (2 Replies)
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| 5/27/2015 7:48 PM | |
Joined: 4/16/2015 Last visit: 6/3/2024 Posts: 35 Rating:
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S7-1200 CB1241 Modbus communication with Teco Servo Drive. I am trying to establish ModBus RTU communication with the drive as only one slave. I need help to understand some points in this regard, Using TIA portal V12. With S7-1200 Programmable Controller System Manual CB 1241 Connecting Terminals are M , TA, T/RA, T/RB, TB, RTS, TA, T/RA short with a Loop and connected to "+Data" Connection of Servo Rs485 TB, T/RB short with a Loop and connected to "-Data" Connection of Servo Rs485 Cable distance is less then 1 meter I did not use shielded cable, I checked with meter that "M" terminal on CB 1241 is not connected to GND of PLC please suggest where I should connect this "M" terminal ? Also RTS is left open is it OK ? Servo drive have three choices of Modbus RTU communication protocols that is, 8 bits, None parity, 2 stop bits 8 bits, Even parity, 1 stop bits 8 bits, Odd parity, 1 stop bits In Configuration Block MB_Comm_Load input parameters did not have choice of Stop Bits Parameter how to manage this ? And then which protocol is best for this application ? Using MB_Master communication block I could not understand parameters "Mode" and "Data_Add". In the system manual mentioned Table 12-69 page 752, Modbus address are 5 digit Decimal numbers, while communication addresses mentioned in servo drive manuals are 3 digit hex numbers, Also Modbus Function parameter is not available on this block, Please help me to understand how they build address, function, and mode code to address particular register in slave drive. pakplc ----------------------------------------------------------------------------------------------------
Split from s7 1200 cb1241 ccommunication problem. |
Last edited by: Min_Moderator at: 5/28/2015 2:26:13 PMNew subject after splitting |
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| 2/3/2018 10:40 AM | |
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Posts: 1 Rating:
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Hi, have you solved your problem ? I am trying to control tech servo with modbus like you. If you solved it, could you share your experiences? |
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