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Modbus TCP/IP communication between S7-300 and Diris A40

Created by: Lukasz Marek at: 10/27/2014 2:02 PM (17 Replies)

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10/27/2014 2:02 PM	Rate (0)
Lukasz Marek Member Joined: 7/8/2014 Last visit: 2/21/2023 Posts: 12 Rating: (0)	Hi Mohagen, I would like to also implement Modbus TCP/IP communication between S7-300 and Diris A40. Could you just confirm me that Siemens S7-300 is configured as Modbus client and Diris A40 is configured as modbus server? Do you know if it is possible to configure if Diris A40 is Modbus client or Modbus server ? Thanks you very much for answer. Have a nice day. Best Regards Lukasz ------------------------ New subject after splitting from error modbus wizard.
	Last edited by: Min_Moderator at: 10/27/2014 3:01 PM Splitted
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10/31/2014 1:32 PM	Rate (0)
Gwawl Experienced Member Joined: 10/21/2011 Last visit: 7/15/2021 Posts: 57 Rating: (17)	Hi Lukasz, yes, you could configure the S7-300 as Modbus client and the Diris A40 as Modbus server. And as far as I know the Diris A40 can only be server. It would not make sense that the Diris A40 is client.

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11/3/2014 6:02 PM	Rate (0)
Lukasz Marek Member Joined: 7/8/2014 Last visit: 2/21/2023 Posts: 12 Rating: (0)	Hi Mohagan Thank you very much for your answer. Actually I’m facing similar problem like I think you had. I need to establish communication between 14 Diras A40 devices and Siemens S7-300 using Modbus TCP/IP protocol. I called block FB108_MODBUSCP once in OB100 and once in OB1 how is described in manual “S7 - OPEN MODBUS / TCP Communication via CP343-1 and CP443-1”. My test configuration is OB100 is as follow: L 3 //first memory area T "CONTROL DAT".data_type_1 //Holding register DB1.DBB28 L 11 // DB adress (DB122.DBW0) T "CONTROL DAT".db_1 DB1.DBW30 LL#50512//Modbus start register T "CONTROL DAT".start_1 DB1.DBW32 LL#50568//Modbus end register T "CONTROL DAT".end_1 DB1.DBW34 Unfortunately I receiving Error and status code equal "A011". Could you tell me how you did your configuration? In my opinion this error code don’t have any sense because DATA_TYPE variable is configured correctly. I used also other Modbus Client like Yokogawa DCS and I also was not able to communicate with Diris A40. For this reason I suspect that problem is in Diris device. Which Ethernet module you are using : ETHERNET MODULE – Ref. 48250203 or ETHERNET MODULE WITH MODBUS RTU GATEWAY – Ref. 48250204? Did you change something on Diras A40 site? I just set IP address, submask and default gateway. I also saw on the web page parameter Device addres that is actually equal 255, did you change this parameter ? Tanks you very much in advance for your help. Best Regards Lukasz

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11/4/2014 7:31 AM	Rate (0)
Lukasz Marek Member Joined: 7/8/2014 Last visit: 2/21/2023 Posts: 12 Rating: (0)	Hi, Just to continue my previous post I attached project that I used for the test. Attachment Modbus_Communication.zip (800 Downloads)

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11/4/2014 7:38 AM	Rate (0)
Lukasz Marek Member Joined: 7/8/2014 Last visit: 2/21/2023 Posts: 12 Rating: (0)	And also captured data. When somebody has idea what could be the issue please let me know. I also contact Socomec support but until now I not received any answer. thanks in advance for your help. Regards Lukasz Attachment CapturedData.jpg (749 Downloads)

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11/4/2014 11:45 AM	Rate (0)
Gwawl Experienced Member Joined: 10/21/2011 Last visit: 7/15/2021 Posts: 57 Rating: (17)	When you want to send a request you need to specifiy the requested data by entering values at the parameter DATA_TYPE, START_ADDRESS, LENGTH and WRITE_READ. If you use the example project you can do this via the variable table. The function block does not automatically collect all the values from the data areas that are specified in OB100. When you set ENQ_ENR the function block needs to know which data you want to read or write. Therefore are the 4 inputs DATA_TYPE, START_ADDRESS, LENGTH and WRITE_READ.

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11/5/2014 7:55 AM	Rate (0)
Lukasz Marek Member Joined: 7/8/2014 Last visit: 2/21/2023 Posts: 12 Rating: (0)	Hi Gwawl You have absolutely right, before I used Siemens as Modbus server and I think that this is the reason of the mistake. Thanks you very much for your comment.I defined value for inputs UNIT, DATA_TYPE, START_ADDRESS, LENGTH and WRITE_READ but unfortunately these not solve my problem – communication is still not working.When I trigger input ENQ_ENR function try to communicate but the output BUSY change the value to 1 and its stay like that. Normally I expect t that I should receive time out and ERROR output equal 1. I’m still not sureif the ports number for Client and for server is correct. Actually in Net pro I set both ports to 502. In the manuals if Diris I didn’t found any information about port number.In attachment you can find corrected project. Attachment Modbus_t.zip (633 Downloads)

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11/5/2014 8:03 AM	Rate (0)
Lukasz Marek Member Joined: 7/8/2014 Last visit: 2/21/2023 Posts: 12 Rating: (0)	I also captured traffic on the network using Wireshark. In my opinion S7-300 send correctly the message to read holding registers but if think that there in problem of interratation and answet to this message by Diris. Somebody have any idea why comminication is not working ? Regards Lukasz Attachment Captured Data.zip (497 Downloads)

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11/5/2014 11:06 AM	Rate (0)
Gwawl Experienced Member Joined: 10/21/2011 Last visit: 7/15/2021 Posts: 57 Rating: (17)	Have you tried to send only one telegram to the Diris A40 and not to send cyclical? And check the done counter to see if the request was successfull. In the trace the window size of one of the devices gets zero. This can happen with older CPs when the Modbus blockrecognizes an error then it tries to clear the buffer of theTCP stack by getting one byte after another. When in this time new requests are sent the function blocks can't clear the stack. When the buffer is cleared the block should return the code A008. Thereafter the communication should work again.

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11/5/2014 4:29 PM	Rate (0)
Lukasz Marek Member Joined: 7/8/2014 Last visit: 2/21/2023 Posts: 12 Rating: (0)	Hi Gwawl, Thanks one more time for your very good comments. Today I replaced CP343-1 card to 6GK7 343-1EX30-0XE0 and communication start working it means that I received some DONE_NDR and also some ERROR outputs. I saw that when the devices are connected using only one switch between the “error counter” is equal 0. In reality between Siemens S7-300 and Diris A40 I have 3 switches and in this case statistics not looks so good. After few minutes I have “error counter” equal 1605 and “done counter” equal 104. I already try to extend MONITOR time to 4 s but this modyfication not help. Do you have idea what could be the reason of some many errors? How you can see in my project actually I set input ENQ_ENR every 2s and I reset this input using signals DONE_NDR or ERROR. Do you think that this logic is OK? Attachment Modbus_t.zip (555 Downloads)

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11/5/2014 4:33 PM	Rate (0)
Lukasz Marek Member Joined: 7/8/2014 Last visit: 2/21/2023 Posts: 12 Rating: (0)	Actually I have data but I have problem to find out what is format of the data. What I try to read them as floating point the values looks as trash. Do you have idea if there is any byte swapping in communication between S7-300 and Diris ? Attachment OnlineData01.jpg (595 Downloads)

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11/5/2014 5:00 PM	Rate (0)
Gwawl Experienced Member Joined: 10/21/2011 Last visit: 7/15/2021 Posts: 57 Rating: (17)	Which error code do you get returned from the Modbus block? About the data you recieved: Do you know whatsomevalues of the data should be? If you convert the PP_VOL_U12 into a decimal value you would get 39484. If you divide it by 100 you would geht 394,84 which would be the value I would expect in a 230V system. If you do the same to the FREQ, you would get: 1387hex -> 4999dec -> 49,99Hz. This value seems also plausible. I don't know if the rest of the values could be converted the same. In the manual of the Diris A40 you should find information in which format the data is transferred.

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11/5/2014 5:51 PM	Rate (0)
Lukasz Marek Member Joined: 7/8/2014 Last visit: 2/21/2023 Posts: 12 Rating: (0)	I think that you are again right. It looks like most of the data are DINI and need to be divided by 100. Little bit strange format for me because I expected REAL. I will check for error code tomorrow when I will do additional tests. Regards Lukasz Attachment DirisA40ModbusTcp.pdf (577 Downloads)

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11/6/2014 7:49 AM	Rate (0)
Lukasz Marek Member Joined: 7/8/2014 Last visit: 2/21/2023 Posts: 12 Rating: (0)	Hi, I verified and during ERROR STATUS output have error code 16#8183. Unfortunately I was not able to find meaning of this code in manual. Somebody have idea what could be the problem? Thanks in advance Lukasz Attachment FB108_ErrorCode.jpg (499 Downloads)

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11/6/2014 10:34 AM	Rate (0)
Gwawl Experienced Member Joined: 10/21/2011 Last visit: 7/15/2021 Posts: 57 Rating: (17)	When you open the CONTROL_DAT block online you should see in Save_STATUS_FUNC from which function the error code is returned. It could be from AG_SEND/AG_RECV and mean that the connection is not established.

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11/6/2014 11:37 AM	Rate (0)
Lukasz Marek Member Joined: 7/8/2014 Last visit: 2/21/2023 Posts: 12 Rating: (0)	I check and error is from function AG_SEN. I also run Special Diagnostic for card CP343-1 and there when I monitor status of connection once is closed and after 1 or 2 s established and again closed. It looks like one site (CP343-1 or Diris) close the connection. Now the question how to know where exactly is the problem ? Attachment OnlineData.zip (479 Downloads)

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11/10/2014 1:26 PM	Rate (0)
Gwawl Experienced Member Joined: 10/21/2011 Last visit: 7/15/2021 Posts: 57 Rating: (17)	Perhaps in a wireshark trace you could see why the connection gets shut down.

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11/11/2014 2:38 PM	Rate (0)
Lukasz Marek Member Joined: 7/8/2014 Last visit: 2/21/2023 Posts: 12 Rating: (0)	Hi Gwawl, I already try to look on wireshark trace and for me it looks like Diris (IP 172.16.32.227) from time to time not responding on request send from CP343-1 (IP 172.16.32.227) . I already try to increasy MONITOR time in FB108 block even to 20 s but it is still the same. Mayby next week I will have time to connect PLC to diffrent place in the network. I will let you know when I will find root cause of the problem. Regards Lukasz Attachment CapturedData.zip (430 Downloads)

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