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| 5/27/2007 12:12 PM | |
Joined: 1/7/2006 Last visit: 3/9/2025 Posts: 2705 Rating:
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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. |
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I hope that the answer will help, if you have still questions, don't hesitate to ask me. |
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| 5/28/2007 12:48 PM | |
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Joined: 1/7/2006 Last visit: 3/9/2025 Posts: 2705 Rating:
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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. |
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I hope that the answer will help, if you have still questions, don't hesitate to ask me. |
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| 5/28/2007 8:51 PM | |
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Posts: 279 Rating:
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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 |
| 5/29/2007 8:53 AM | |
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Posts: 279 Rating:
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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. |
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