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Theoretical information about Modbus Network

Created by: r2407 at: 12/6/2010 12:25 PM (14 Replies)

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12/6/2010 12:25 PM	Rate (0)
r2407 Posts: 111 Rating: (0)	Dear Mr. Late, First of all, I honestly should say that I got impressed by your skill and domination in Modbbus field. I am involved with a complex project that in a part of it I required to stablish Modbus Network and since it's my first modbus experience and the related equipment has been sent to the site(it's abroad), so I can't access devices and examine.Therefore, I need to expand my knowledge theorically so that I won't face difficulties there. Iwould be pleased if you explain me what I should do step by step or if there is a comprehensive source so that I could get complete information throgh it. You know I studied a lot in forums and siemens manualls, however, the more I studied, the more confused I got. Anyway I am very glad that I found and got to know you. Regrds Splitted from Modbus Network
r2407 Posts: 111 Rating: (0)	Last edited by: O_Moderator at: 12/6/2010 12:36 PM new subject after splitting
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12/6/2010 12:56 PM	Rate (0)
smiffy Platinum Expert Joined: 1/17/2007 Last visit: 3/10/2025 Posts: 1557 Rating: (540)	Check out the www.modbus.org website.
	Programming today is the race between software engineers building bigger and better idiot proof programs, and the universe producing bigger and better idiots. So far, the universe is winning...
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12/6/2010 1:11 PM	Rate (0)
Kaulquappe Posts: 3093 Rating: (324)	Hello R2407, did you send all equipment to site or do you still have a test system in your lab and only the Modbus devices are missing? If only the Modbus devices are missing you can use a simulation program for a PC to check the Modbus communication. Regards, Kaulquappe
Kaulquappe Posts: 3093 Rating: (324)
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12/6/2010 2:07 PM	Rate (0)
r2407 Posts: 111 Rating: (0)	Hi Kaulquappe, No unfortuntly evrything hsbeen sent. However, since I am experienced in industrial automation and I have worked with ethernet and profibus, I beleive I can understand establishing modbus network, if only I find a complete ad comprehensive source and of course some great experts. Regards
r2407 Posts: 111 Rating: (0)
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12/6/2010 3:43 PM	Rate (0)
Kaulquappe Posts: 3093 Rating: (324)	Hello R2407, to give you some advice, we need some information regarding your configuration. - Which Modbus network are you going to setup, RS485 or Ethernet? - Which Simatic module do you use? - Does the S7 act as master/client or slave/server? You need information which data types (function codes) and addresses of the third party deviceshould beread and written. Regards, Kaulquappe
Kaulquappe Posts: 3093 Rating: (324)
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12/6/2010 9:58 PM	Rate (0)
Late Platinum Expert Joined: 1/7/2006 Last visit: 3/9/2025 Posts: 2705 Rating: (321)	Hi, Please look in the Modbus Network for all information about the handbooks and the software. You could read everything there and I worked out also a communication about a master with slaves.
	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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12/7/2010 5:21 AM	Rate (0)
r2407 Posts: 111 Rating: (0)	Hi Kaulquappe, I use CPU 315 PN and CP341-1. My network is RS-485 and my CP is master and I need to write and read data. Regards
r2407 Posts: 111 Rating: (0)	Last edited by: r2407 at: 12/7/2010 5:23 AM
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12/7/2010 5:30 AM	Rate (0)
r2407 Posts: 111 Rating: (0)	Hi Mr. Late, I have studied completely that forum ad actually I left my message there, but due to some reasons my message was split and another thread was created. I have figured out how to wire, now,I want to know that for establishing a modbus network I need to use the siemens example. And if so, for my project that I have 14 nodes what changes I should make to the example... , and any useful information I would require. Regards
r2407 Posts: 111 Rating: (0)
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12/8/2010 5:32 PM	Rate (0)
Kaulquappe Posts: 3093 Rating: (324)	Hello R2407, you need one call of P_SND_RK and you have to change the input parameters regarding to your requirements. So if you want to read one telegram from each slave you have to program a sequencer for all 14 slaves. If you need two requests for each slave, you need a sequencer with 28 steps. Regards, Kaulquappe
Kaulquappe Posts: 3093 Rating: (324)
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12/9/2010 5:41 AM	Rate (0)
r2407 Posts: 111 Rating: (0)	Hi Kaulquappe , Could you please explain more? What do youmean ofsequencer and how can chande prametres? I would be thankful if you send me exact and detail information. Regards
r2407 Posts: 111 Rating: (0)
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