4/28/2016 12:02 PM | |
Joined: 3/20/2012 Last visit: 8/13/2024 Posts: 118 Rating: (1) |
Hi, I've got a problem with a simple Modbus RTU (RS485) communication. The Comm_Load block returns no "done" and no "error" but a "status" 16#7000 (I've tried to set it to 0, but it comes backs to 16#7000). So the Modbus Master doesn't start, and i've never seen the leds Tx/Rx light. The hardware configuration is based on a CM Ptp / ET200SP ST Station on a Profinet IO, with a 1513 Cpu. All is ok, i've got no defaut, no diagnostic. I've also tried with a S71214 with a CM 1241 rs485. Got the same issue. The DB Modbus Data is not optimised. I've looked into all the examples found on this site, but never found any differences in code, parameters, data, or configuration... See the screenshots attached. Thanks for your help. Best regards. Olivier. AttachmentScreenShot.zip (999 Downloads) |
This contribution was helpful to1 thankful Users |
4/29/2016 10:41 AM | |
Joined: 3/20/2012 Last visit: 8/13/2024 Posts: 118 Rating: (1) |
My TIA Portal is V13 + sp1 +upd6. Best regards. |
5/1/2016 6:03 PM | |
Joined: 4/21/2006 Last visit: 9/17/2024 Posts: 510 Rating: (24) |
New question published by Roger Echave is split to a separate thread with the subject Modbus RTU: status = 7000. Best regards |
7/14/2016 10:41 AM | |
Joined: 9/3/2014 Last visit: 3/13/2019 Posts: 4767 Rating: (123) |
New question published by AutoGen_958102 is split to a separate thread with the subject S7-1515-2 PN with RS232 slave, COMM_LOAD will not output. Best regards |
3/1/2019 6:05 PM | |
Posts: 3093 Rating: (323)
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Hello uurr123, How do you evaluate the status of system blocks in STEP 7 (TIA Portal)? Regards, |
Last edited by: Kaulquappe at: 3/1/2019 6:05:48 PM |
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3/4/2019 4:49 PM | |
Posts: 20 Rating: (0) |
Hello kaulkuappe , I saved the error status by using the move and 16#80C8 showed up . Is there any specific wire connection method for modbus ? |
4/24/2019 11:37 AM | |
Posts: 20 Rating: (0) |
Hello everyone . I am still facing modbus rtu communication problem . I tried with the modscan and I can get the values from flowmeter . I put the pictures of the PLC programme and flowmeter register map Is there anyone can help me with this issue ? Attachmentmodbusproblem.pptx (419 Downloads) |
4/24/2019 4:49 PM | |
Posts: 3093 Rating: (323)
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Hello, A wrong response frame would result in a different error number. Regards, |
4/25/2019 5:44 PM | |
Posts: 3093 Rating: (323)
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Hello, Regards, |
4/26/2019 10:42 AM | |
Posts: 20 Rating: (0) |
Hello Kaulquappe , I attached the pictures . and I would like to thank you very much for your support Attachmentsend_receive.pptx (378 Downloads) |
4/29/2019 12:26 PM | |
Posts: 20 Rating: (0) |
Hello again , I have tried it but nothing changed . pictures attached AttachmentNew Microsoft PowerPoint Presentation.pptx (304 Downloads) |
4/29/2019 2:02 PM | |
Posts: 3093 Rating: (323)
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I'm afraid, no more ideas to solve the problem. Regards, |
4/29/2019 4:22 PM | |
Posts: 3093 Rating: (323)
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Just an idea more: delete the instance DB of MB_MASTER and generate it again. Regards, |
5/3/2019 7:48 AM | |
Posts: 20 Rating: (0) |
Another interesting situation is from yesterday on 2 times I could read the values so far . pictures attached . question is why cant PLC get the values constantly ?something that I couldnt find is missing why does ' PLC gets values 2 times in last 12 hoursbut not all the time ? any ideas ?? thank you AttachmentNew Microsoft PowerPoint Presentation (2).pptx (437 Downloads) |
5/8/2019 4:10 PM | |
Posts: 20 Rating: (0) |
noone can help me about this issue |
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