12/7/2020 9:48 AM | |
Joined: 5/8/2020 Last visit: 9/11/2024 Posts: 42 Rating: (0) |
hello, I'm currently having a hard time retrieving any register data from my slave device.I think issue might be in the initial Configuration/Modbus_Comm_Load portion. i connected to my device but still can't read any register data from it. the communication still works even if i change the slave id address or if i change the baud rate in my DEVICE. there are some screenshots to the blocks i used in my program. i'm using tia portal v15. thanks in advanced Attachmentcaptures tia portal.zip (232 Downloads) |
Last edited by: rachid10 at: 12/07/2020 09:50:00 |
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12/7/2020 1:01 PM | |
Joined: 3/5/2014 Last visit: 8/5/2022 Posts: 5521 Rating: (1054)
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hi rachid10, please evaluate the status of the MB-blocks, like described in following FAQ: How do you evaluate the status of system blocks in STEP 7 (TIA Portal)?Have a look to the TIA-block-help. The status-values are described there. hope this helps, regards, |
FCK WAR! |
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12/7/2020 4:13 PM | |
Joined: 5/8/2020 Last visit: 9/11/2024 Posts: 42 Rating: (0) |
HELLO, i tried to do that but it dosn't help me it there are some screens for master blocks error and status and modbus com load error and status. i wish that you help me very soon because i really have an emergency situation. thank you. Attachmentport.zip (244 Downloads) |
3/1/2021 5:50 PM | |
Joined: 5/8/2020 Last visit: 9/11/2024 Posts: 42 Rating: (0) |
HI ALL, im having a hard time here im using s7 1500 plc connecting with 2 Simatic et200sp each module has a CM PTP for communication modbus rs485. I managed to connect to my first module wthout any problem but i can't connect to two of it at same time i think i have problems in blocks but i do not know where. please help thank you in advance.
AttachmentprojectCOMM.zip (253 Downloads) |
Last edited by: Jen_Moderator at: 03/02/2021 08:23:45Edited text for better reading. |
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3/2/2021 5:14 PM | |
Joined: 4/28/2015 Last visit: 2/7/2024 Posts: 10533 Rating: (821)
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Hello rachid, no I don't have better solution as you have now. You have some code problems for sure, maybe Slaves not respond correctly, similar problem have also this user here: S7-1500 with 2 CM modules Modbus RTU communication Pls be sure test both lines independently (one at time) then try coordinate both at time what must work without problems. Simply your 2 CMs can work independently at time. |
Last edited by: Duris_I at: 03/02/2021 17:16:48Last edited by: Duris_I at: 03/02/2021 20:09:24With best regards... |
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3/3/2021 9:49 AM | |
Joined: 5/8/2020 Last visit: 9/11/2024 Posts: 42 Rating: (0) |
hello sir, yes you'r right i have an error code at modbus master blocks of the second cm ptp the code is 16#8281. but still can't resolve it |
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