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Modbus RTU realisation

Created by: PLC_inside at: 5/31/2008 1:40 PM (2 Replies)

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5/31/2008 1:40 PM	Rate (0)
PLC_inside Posts: 9 Rating: (0)	I have several problem with coupling Modbus RTU based system with CP341. I configured systemin project, but i have SF failure on CP341 comunication processor. (i looking for samples with modbus realisation...).
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5/31/2008 10:09 PM	Rate (0)
Late Platinum Expert Joined: 1/7/2006 Last visit: 12/23/2024 Posts: 2705 Rating: (320)	Hi, Have you seen my thread ? Modbus Network The errormessages you could find in the handbook of the Modbus driver.... Slave or Master...
	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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6/1/2008 3:56 AM	Rate (0)
PLC_inside Posts: 9 Rating: (0)	In standart samples used such protocols Modbus as 3964(R), RK512, ASCII. As I understand, standart packet frame in all this cases have differs. In my case I have to configured system as Modbus master (and other gauges will be slave modbus nodes). I not so long in Simatic... Newbee... So I have a question about configuration system. In test cofiguration I use 2 commucation processor... CP343 Lean and CP341... Both on one rail rack. Is it works? (Or i need find somehing like ET200m... for expanding system via profibus? I planing to programming system via ethernet. I met before realisation FBD codes for S200 Simatic for Modbus operation... As i understand, i need similar code (standart FC.. for modbus operation). I use S300 system. A not understand what kind of specification need it for setting system. Slave Modbus module use registers with addresation. I know there localisation. But i don`t understand, reading this register should be from one to another... in sequence or can be copy as data frame. Thanks for answer! Attachment configuration.JPG (315 Downloads)
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