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Modbus interface with simatic s7 400

Created by: Begho at: 5/27/2007 8:40 AM (24 Replies)

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5/27/2007 8:40 AM	Rate (0)
Begho Posts: 37 Rating: (0)	I am new on using Siemens PLC.We are going to connect SEPAM (the microprocessor protection relay from SCHNEIDER) to S7-400 PLC.are there any special module should be installed on the main rack for that?My question is how to do that? For example ....to do that on Allen Bradley system there should be a PROSOFT interface card installed on the main rack. Thank You.
Begho Posts: 37 Rating: (0)
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5/27/2007 12:12 PM	Rate (0)
Late Platinum Expert Joined: 1/7/2006 Last visit: 2/16/2023 Posts: 2705 Rating: (311)	Begho I am new on using Siemens PLC.We are going to connect SEPAM (the microprocessor protection relay from SCHNEIDER) to S7-400 PLC.are there any special module should be installed on the main rack for that?My question is how to do that? Hi Begho, With which protocol is that protection relay working ? I have found the next text on Internet via Google: Modbus communication enables Sepam to be connected to a remote monitoring and control system equipped with a master Modbus communication channel and a physical link of the RS 485 type, or another interface equipped with an appropriate converter.The Modbus protocol used by Sepam is a compatible sub-group (Jbus) of the RTU Modbus (1) protocol (a Modbus master can communicate with several Sepam units). Sepam is always a slave station. When the above is true for your Sepam, then you need a serial card, the6ES7441-2AA04-0AE0 CP441-2and a submodule for RS485/422 6ES7963-3AA00-0AA0 its a IF963- X27, RS422/485-Module, the you need some cabeling, see the link cablefor more information how to connect the CP to the Sepam. As software you can download the parametrizing package for free from internet: Download CD "CP340, CP341, CP440, CP441", version: V5.1+SP7 and then you need to buy the Modbus driver Master. The handbook CP 441 Point-to-Point Commmunication Installation and Parameter Assignment is installed when you install the above CD. The Modbus RTU Driver have to be bought seperately and the Modbus Software for a Master is placed on the next link Loadable driver CP PtP Modbus Master V3.1.3the numberis6ES7870-1AA01-0YA0when you already have downloaded the software for the master. When you need to place more Sepam measurement equipment on one bus, then you need to use RS485 as Multidropbus.
	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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5/27/2007 2:07 PM	Rate (1)
Calm_down Posts: 324 Rating: (30)	Hello Begho, well, this is not that easy to answer but I think there is only one question to answer: Which IO Bus will you use? If you use PROFIBUS you just need either a CPU with PROFIBUS Interface or you need a CP with PROFIBUS Interface, like the CP 443-5 Extended (S7-400) or the CP 342-5 (S7-300). I choose these modules because I guess if you use PROFIBUS you will use the DP Profile. If you use MODBUS it is a bit more difficult. This is due to the fact that SIMATIC is not supporting MODBUS by Standard. To get it to work you will have to use a serial CP, like the CP 441-2 (S7-400) or the CP 341 (S7-300) plus a certail MODBUS Master Driver to be additionaly installed. I hope I could help you a bit. Stay calm.
Calm_down Posts: 324 Rating: (30)
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5/27/2007 3:23 PM	Rate (0)
Begho Posts: 37 Rating: (0)	thank you very much for your replies.....but i am still confused from the answers...I have two cocerns now: 1-I'm u 1-I am using s7-400 with cpu 417-4....Also I am using the porofibus dp interface to communicate with the distribute I/O...Is it possible to use the other port which on the processor(MPI/DP) to interface with SEPAM via MODBUS??!!(I don't think so but I want to make sure). 2-I could not understand this point on your answer: "As software you can download the parametrizing package for free from internet: Download CD "CP340, CP341, CP440, CP441", version: V5.1+SP7 and then you need to buy the Modbus driver Master."
Begho Posts: 37 Rating: (0)
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5/27/2007 6:04 PM	Rate (0)
Late Platinum Expert Joined: 1/7/2006 Last visit: 2/16/2023 Posts: 2705 Rating: (311)	Begho -I am using s7-400 with cpu 417-4....Also I am using the porofibus dp interface to communicate with the distribute I/O...Is it possible to use the other port which on the processor(MPI/DP) to interface with SEPAM via MODBUS??!! (I don't think so but I want to make sure). -I could not understand this point on your answer: "As software you can download the parametrizing package for free from internet: Download CD "CP340, CP341, CP440, CP441", version: V5.1+SP7 and then you need to buy the Modbus driver Master." Hi Begho, The 2nd port of the CPU 417 can't be used for the Protocol Modbus Master. The parametrize software for the CP 441-2 is for free (standard software for programming the cards mentioned), and the Modbus Master Software have to be bought.
	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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5/28/2007 7:00 AM	Rate (0)
Begho Posts: 37 Rating: (0)	Hello Late Thanks for your help. I think it is clear now that I have to insert a communication processor cp441-2. But....What is the function of the modbus master software?from where to buy it?How to read about it? Also...How to configure the read blocks to read the power measurements from sepam? I'm sorry for that many questions. Thanks again.
Begho Posts: 37 Rating: (0)
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5/28/2007 12:48 PM	Rate (1)
Late Platinum Expert Joined: 1/7/2006 Last visit: 2/16/2023 Posts: 2705 Rating: (311)	Begho 1. I think it is clear now that I have to insert a communication processor cp441-2. 2. But....What is the function of the modbus master software? 3. From where to buy it? 4. How to read about it? 5. Also...How to configure the read blocks to read the power measurements from sepam? Hi Begho, On your questions the next answers: 1. Perfect. 2. The Modbus Master software is a driver that is a special driver that must be loaded on the CP441-2, also a dongle for on the backside of the CP441-2 is provided with that software. 3. Siemens sell this driver, it is software that comes with the dongle, you can also already get the software with the earlier download I have given to you. The package I recomended is the COPY LICENS which is some cheaper then the hole package (that you didn't need if you have downloaded the free software package to program the CP's and the software for the Modbus Master where you have to buy the dongle). 4.If you connect everything (is it one Sepam or are it more then one {then you need a multidrop bus)) then nothing is happening, so you have to decide which registers and coils are to be read or write to. 5. There is a Modbus Master thread where I have placed already some software (you are coming on the 2nd page of this thread, see my text from 25.07.2006, 21:40 for some idea how to program it). So you need to know what you want to read/write to this Sepam. Another question from me is, have you aleady this Sepam? When not, there are the same equipment (for instance from Siemens) that are working on Profibus, then you need nothing extra.
	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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5/28/2007 8:51 PM	Rate (0)
Jesper Pedersen Posts: 279 Rating: (30)	In addition to the previous fine suggestions, you should also consider the the 1SI interface modules to be used in an ET200S distributed i/o station on Profibus. Part number for such a module with Modbus RTU protocol onboard is 6ES7138-4DF11-0AB0. It is significantly less expensive than a CP441 + loadable Modbus driver. As fas as I know the maximum baudrate is 19200, so that may be a limitation for you. Also, if the Sepam system supports Modbus TCP, then maybe this is an interesting option to you as well. There is a library for making an CP443-1 talk Modbus TCP, look here: http://www.industry.siemens.com/IT4Industry/en/solution_services/SIMATIC_Addons/proto_mod.htm
Jesper Pedersen Posts: 279 Rating: (30)
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5/29/2007 8:20 AM	Rate (0)
Late Platinum Expert Joined: 1/7/2006 Last visit: 2/16/2023 Posts: 2705 Rating: (311)	Hi Jesper, Thats a good suggestion. Is it with the ET 200S SI also posible to do JBUS? If you only have one slave then it will work fine, but when you have more slaves then it will be not that fast... But when you don't need speed it is a good alternative for the CP441-2 + Modbus driver.
	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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5/29/2007 8:53 AM	Rate (0)
Jesper Pedersen Posts: 279 Rating: (30)	Hi Late. The 1SI module comes in5 variants with the following fixed protocols. 3964(R) ASCII Modbus RTUMaster Modbus RTU Slave USS Master So no JBUS unfortunately.
Jesper Pedersen Posts: 279 Rating: (30)
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