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Modbus Slave configuration with ET 200S 1SI Module

12/27/2007 6:39 AM	Rate (0)
Pravin Patil India Posts: 22 Rating: (0)	Dear All, I am using ET200S 1SI Modbus CP MLFB No. 6ES7-138-4DF11-0AB0 I want configure it for modbus Slave. In my application I need to transfer my data to a third patry which is Modbus RTU master (PORT RS485) So I need to configure myself as slave Can you please help in doing this? Thankx & regards Praveen Patil
Pravin Patil India Posts: 22 Rating: (0)
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12/27/2007 7:33 AM	Rate (1)
dchartier Grandmaster-Expert Joined: 9/27/2006 Last visit: 3/18/2025 Posts: 12344 Rating: (2707)	Hello Pravin; Here is what the manual has to say about configring Modbusslave status on a 1SI module: From the ET200S_1SI_e.pdf manual Modbus slave connection The Modbus slave connection for the module consists of two parts: • Modbus slave driver • Modbus communication function block for the SIMATIC S7 CPU Modbus slave communication FB In addition to the Modbus slave driver, the Modbus slave connection requires a special communication FB in the S7 CPU. The Modbus communication FB processes all the functions required for the connection. FB 81(S_MODB) receives the Modbus protocol and converts the Modbus addresses into SIMATIC memory areas. FB 81(S_MODB) must be called in the cyclic program of the user program. The Modbus communication FB uses an instance block as the work area. There is much more information in this manual; if you don't have it, download it from Siemens' support website. Hope this helps, Daniel Chartier

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12/27/2007 2:33 PM	Rate (3)
Late Platinum Expert Joined: 1/7/2006 Last visit: 3/9/2025 Posts: 2705 Rating: (321)	Pravin Patil India I am using ET200S 1SI Modbus CP MLFB No. 6ES7138-4DF11-0AB0 I want configure it for modbus Slave. In my application I need to transfer my data to a third patry which is Modbus RTU master (PORT RS485) So I need to configure myself as slave Dear Praveen Patil, You have the right module, connect it as a RS485 module to the master, please look very well if the wiring is ok.. More data is on page 3-61 and 3-14 for the wiring of the module. In the handbook Serial Interface Module ET 200S 1SIyou will find how to program the MODBUS Slave in chapter 3.6 as of page 3-55, The Function Codes 01, 02, 03, 04, 05, 06, 07, 08, 11, 12, 15 and 16 may used. There is like FB80 for the CP341 also a FB81 "S_MODB" that have to be used for the best programming, seeFunction Blocks, Examples and User Manuals for the ET200S 1SI Serial Interface for the blocks and a example.
	I hope that the answer will help, if you have still questions, don't hesitate to ask me. All the best, Late Never say never, think in solutions, not in trouble......
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