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Modbus Slave (CP341) Sample Program-

Created by: Amit_86 at: 4/20/2012 2:33 PM (42 Replies)

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4/20/2012 2:33 PM	Rate (12)
Amit_86 Platinum Member Joined: 3/18/2008 Last visit: 12/8/2023 Posts: 1750 Rating: (272)	Dear All, Hereby i am attaching Modbus Slave Program for ready reference. In this reference project, CP341(RS485) is Modbus Slave and Yokogawa DCS is Modbus Master(RS232). you can find Sample Program with Mapping Details in Excel FIle and Cable Configuration as well. Hope this will help to understand Modbus Slave Concept eailsly ans especially to those who are Configuring Modbus Slave for the first time. Attachment Modbus Slave Program.zip (5547 Downloads)
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This contribution was helpful to 24 thankful Users smiffy Ton Verra playerslight arcebk PHS Hit_Formula Anit Kumar Sankar Jens_app kiensnow fk19744 Saggy EgoFooller sorooshi plc.giang Kosta107 Ivan.M. Vivesh jtr2 jarrinsonconde tausif lou-powell Md Gouse G_R_E_Y_31

10/15/2012 1:52 PM	Rate (0)
victorious vino Regular Member Joined: 10/14/2012 Last visit: 7/11/2023 Posts: 10 Rating: (0)	I have seen the attachment..But i guess is not helping as much as i wanted.Three blocks are protected.So to be clear,I would like to know how they are mapping the memory of yokogawa DCS to siemens CP..

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10/17/2012 8:42 AM	Rate (0)
Amit_86 Platinum Member Joined: 3/18/2008 Last visit: 12/8/2023 Posts: 1750 Rating: (272)	victorious vino I have seen the attachment..But i guess is not helping as much as i wanted.Three blocks are protected.So to be clear,I would like to know how they are mapping the memory of yokogawa DCS to siemens CP.. Dear Victorious, In my Sample Program, I have created Function & Data block apart from Blocked Library Blocks. You are not required to understand logic inside Blocked/Protected Library Blocks especially when you are doing third party communication. For understanding the mapping Concept, you need to have basic understanding of Modbus Function Codes. Please go through in details with below all important document first of all. After that try to co-relate Excel File Modbus address starting with 40001 with FC & DB in above example. Hope this helps. Modbus General Description
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10/27/2012 1:37 PM	Rate (0)
sorooshi Posts: 19 Rating: (0)	dear amit_86 first of all i want to appreciete for your kind sharring but have one question, thus i understand from siemens manuals we should call fb7, fb 8 in our programming and also we should assign parameter too, i can not understand this part of ur program, would you please help me to understand this concept...
sorooshi Posts: 19 Rating: (0)
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7/3/2013 10:03 AM	Rate (0)
Jens_app Gold Member Joined: 1/5/2011 Last visit: 6/15/2024 Posts: 815 Rating: (123)	Hello Amit_86, Thanks for the example on modbus slave, but I still have a question.I'm new to modbus so it might be anewbish question. You store all your data in DB4, but I can't seem to find where you reffer to that datablock. Where do you specify whichdatablock is used tostore send or received data? I hope my question is clear. Thanks in advance, Jens
	Keep it simple and on-topic. A simple straight-to-the-point answer is often of more quality than a complicated one.
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7/3/2013 12:03 PM	Rate (0)
Amit_86 Platinum Member Joined: 3/18/2008 Last visit: 12/8/2023 Posts: 1750 Rating: (272)	Hello, have you seen hardware configuration properly?? it is defined in the property of cp341. have you installed software & loadable drivers addon package to simatic manager softwate? i guess it is not installed in your case hence you are not able to see the configuration parameters of cp341. please check & revert back.
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7/3/2013 12:25 PM	Rate (0)
Kaulquappe Posts: 3093 Rating: (323)	sorooshi dear amit_86 first of all i want to appreciete for your kind sharring but have one question, thus i understand from siemens manuals we should call fb7, fb 8 in our programming and also we should assign parameter too, i can not understand this part of ur program, would you please help me to understand this concept... Hello Sorosshi, FB7 and FB8 are required for Modbus master communication. With Modbus slave FB80 should be called, and it calls FB7 and FB8 internally. Regards, Kaulquappe
Kaulquappe Posts: 3093 Rating: (323)	Last edited by: Kaulquappe at: 7/3/2013 12:26 PM
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7/3/2013 3:06 PM	Rate (0)
Jens_app Gold Member Joined: 1/5/2011 Last visit: 6/15/2024 Posts: 815 Rating: (123)	Hi Amit_86, thanks for your fast reply. You were right, I hadn't installed the required software properly. I now installed the required software to see the parameter settings. The only problem is that I can't check the parameters since I haven't got my slave dongle yet, therefor the configurable loadable driver isn't installed on my PC. I'm pretty sure once that's done I will be able to see all parameters....Sothanks for helping!!! By the way, if anyone has problems with the installation of the software on a 64bit system(for example: error message "system has already been modified") make sure you get the correct version (64bit compatible). Here is the link: http://support.automation.siemens.com/WW/view/en/27013524.
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7/3/2013 3:47 PM	Rate (0)
Kaulquappe Posts: 3093 Rating: (323)	Jens_app The only problem is that I can't check the parameters since I haven't got my slave dongle yet, therefor the configurable loadable driver isn't installed on my PC. Hello Jens, the dongle is only necessary to run the Modbus driver on the CP. Even without dongle it is possible to setup a project and assign the parameters. Regards, Kaulquappe
Kaulquappe Posts: 3093 Rating: (323)
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7/3/2013 5:27 PM	Rate (1)
Amit_86 Platinum Member Joined: 3/18/2008 Last visit: 12/8/2023 Posts: 1750 Rating: (272)	Jens_app Hi Amit_86, thanks for your fast reply. You were right, I hadn't installed the required software properly. I now installed the required software to see the parameter settings. The only problem is that I can't check the parameters since I haven't got my slave dongle yet, therefor the configurable loadable driver isn't installed on my PC. I'm pretty sure once that's done I will be able to see all parameters....Sothanks for helping!!! By the way, if anyone has problems with the installation of the software on a 64bit system(for example: error message "system has already been modified") make sure you get the correct version (64bit compatible). Here is the link: http://support.automation.siemens.com/WW/view/en/27013524. Hello, you can download ptp parameter configuration software from here. Download CD "CP340, CP341, CP440, CP441" Loadable driver for Modbus RTU Loadable Driver Modbus Slave (RTU)
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