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Modbus RTU communication - need to assign all the new metering parameter addreses into the STEP 7

Created by: MauricioRC at: 6/27/2014 10:14 PM (7 Replies)

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6/27/2014 10:14 PM	Rate (0)
MauricioRC Posts: 25 Rating: (0)	Hello to all, I have a problem with aMODBUS network, I am working with theCP 341 RS422/485as a modbus Master. I am using STEP 7 V5.5. My SIMATIC device is CPU 319-3 PN/DP. I have 12 devices connected into my modbus network and I want to know how can Iread the Metering Parameter Addresses(e.g. frequency, phase voltage V1, phase line current I1, phase L1 power P, etc) of each device. Also I would like to ask you how can Iread the slave addressof each slave-device. For example: I have I multi-functional power meter device (named MIC-2) some metering parameter addresses are the following (I took this information from the user's manual of my device): ADDRESS / PARAMETER / DATA TYPE 4000H~4001H / Frequency / float 4002H~4003H / Phase voltage V1 / float 4004H~4005H / Phase voltage V2 / float 4006H~4007H / Phase voltage V3 / float 4008H~4009H / Average voltage Vavg / float 400aH~400bH / Line voltage V12 / float 400cH~400dH / Line voltage V23 / float 400eH~400fH / Line voltage V31 / float 4010H~4011H / Average line voltage Vlavg F1/ float I am analizing my programm in STEP 7 and I see that this info is saved into Data Blocks (DB). There is one DB for each device connected in the MODBUS network. - How these parameter's addreses were programmed/assigned into the STEP 7? How can I read and modify it? - I would like to know that because I need to insert a new device into my network and I need to assign all the new metering parameter addreses into the STEP 7. Thank you in advace, I would really appreciate your help, Mauricio Rosales C.
MauricioRC Posts: 25 Rating: (0)	Last edited by: CS Moderator at: 6/30/2014 11:21 AM new subject after splitting from /tf/WW/en/Posts/108012#top
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6/27/2014 10:39 PM	Rate (0)
TIBI68 Gold Member Joined: 12/1/2009 Last visit: 2/9/2025 Posts: 672 Rating: (147)	Dear MauricioRC, MauricioRC I am analizing my programm in STEP 7.... That's exacly what you need to do. Analysing and trying to understand how your software works. We don't have your program, we don't know how it is done. Without it will be difficult for us to give you some guide except some general information. I hope you studied already the Modbus Master RTU manual. Thena good idea would be trying to locate the send/receive function blocks in your program. I am sure from there you willbe able to trace more things out. Best Regards. IT WOULD BE NICE IF YOU DONT REPEAT YOUR REQUEST IN MULTIPLE POSTS. YOU CREATE EXTRA WORK FOR THE MODERATOR TO DELETE THEM.
	Last edited by: TIBI68 at: 6/27/2014 10:49 PM Give us your feedback and show us your respect! We take our free time to support you with our knowledge and experience. If this post is helpfull to you kindly click on "Rate" or "Thank".
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6/30/2014 10:34 PM	Rate (0)
MauricioRC Posts: 25 Rating: (0)	Hello TIBI68, I will tryto locate the send/receive function blocks in my program. Thank you for your answer, Mauricio Rosales
MauricioRC Posts: 25 Rating: (0)
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7/3/2014 7:03 AM	Rate (0)
MauricioRC Posts: 25 Rating: (0)	Hello TIBI68, Thanks fow your answer. I have analyzed my program and I identify the FC and the DB which manages the MODBUS parameters. Now my questions are: - How can I transfer all the metering parameters data from my new my measuring device to a Data Block in STEP7? - I am using RS485 connection in my MODBUS network, how can I read the MODBUS information such: Slave address, function code, lenght? I am reading the following MODBUS manual and I dont find there the answer. SIMATIC. S7-300/S7-400 Loadable Driver for Point-to-Point CPs: MODBUS protocol, RTU format, S7 is master Operating Instructions Thank you in advance, I would really appreciate your kind help, Mauricio Rosales
MauricioRC Posts: 25 Rating: (0)
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7/3/2014 9:39 AM	Rate (0)
TIBI68 Gold Member Joined: 12/1/2009 Last visit: 2/9/2025 Posts: 672 Rating: (147)	Dear MauricioRC, MauricioRC Hello TIBI68, Thanks fow your answer. I have analyzed my program and I identify the FC and the DB which manages the MODBUS parameters. Now my questions are: - How can I transfer all the metering parameters data from my new my measuring device to a Data Block in STEP7? Just in the same it is done for all other meters. MauricioRC - I am using RS485 connection in my MODBUS network, how can I read the MODBUS information such: Slave address, function code, lenght? The slave address has to be different to all other existing slaves. From the manual of the device you should be able to find out how to check the configuredaddress. It could be possible that you will have to assign a freeaddress at the device. As per your information table: Function code: 3 (Read Holding registers) Start address: 3999 (Modbus address 44000) Lenght: 18 (44000to 44017) Best Regards.
	Give us your feedback and show us your respect! We take our free time to support you with our knowledge and experience. If this post is helpfull to you kindly click on "Rate" or "Thank".
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7/3/2014 5:23 PM	Rate (0)
MauricioRC Posts: 25 Rating: (0)	Hello TIBI68, Thank you for your answer. But the problem is exactly that I can not find out how do the metering parameter addreses were transfered from the other measuring devices to STEP 7. I need some help in order to understand how does this datatransferis carried out. Could you please advise me how can I do that? I know you do not have my programm in STEP 7, but some programming tip, hint, manual, or counseling would be very helpful for me. Thank you in advance, I would really appreciate your help, Mauricio Rosales Camarillo
MauricioRC Posts: 25 Rating: (0)
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7/3/2014 7:25 PM	Rate (0)
TIBI68 Gold Member Joined: 12/1/2009 Last visit: 2/9/2025 Posts: 672 Rating: (147)	Dear MauricioRC, without having the software in front of me it I cannot help you. Even I need to see and study yourprogram in order to understand how it is working. Only after that study I can tell you whatto do. You already said that you studiedthe manual of the Modbus RTU Master butwithout any help. I suggest you archive andupload us your program and we will look at it. Which software and version are you using for programming (STEP7/TIA)? Best Regards.
	Last edited by: TIBI68 at: 7/3/2014 7:29 PM Give us your feedback and show us your respect! We take our free time to support you with our knowledge and experience. If this post is helpfull to you kindly click on "Rate" or "Thank".
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7/3/2014 11:36 PM	Rate (0)
MauricioRC Posts: 25 Rating: (0)	Hello TIBI68, Thank you for your answer, I understand that is hopeless reach an answer without the program. I need to ask permission from my superiors for upload here the program. I am using as software STEP 7 V5.5 I appreciate your kind help, keep in contact, Mauricio Rosales
MauricioRC Posts: 25 Rating: (0)
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This contribution was helpful to 1 thankful Users TIBI68

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