7/3/2023 4:29 AM | |
Joined: 1/9/2023 Last visit: 10/23/2023 Posts: 1 Rating: (0) |
Hello, i am getting error in PLC S7 1215C dc/dc/dc new i/o access error during process image update CPU has connection Profibus DP 1243-5 extended marter and Profibus DP 1242-5 Extended Slave. ------------------------------------------------------------------------------------------ |
Last edited by: Jen_Moderator at: 07/03/2023 04:30:38New subject after splitting |
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7/5/2023 3:07 PM | |
Joined: 7/7/2010 Last visit: 4/26/2024 Posts: 14639 Rating: (2349)
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I recently ran across this type of situation. To fix the PLC diagnostics buffer from filling up with useless entries, use the OB82 (diagnostics error interrupt OB) to detect when the PB DP devices go online and offline. Have a global tag (preferably a global DB tag) set and reset according to the availability of the PB DP device(s). For logic accessing inputs our outputs to the PB DP devices(s), insert logic to prevent it from executing if the device(s) is(are) offline. At PLC startup (OB100), you can check if the device(s) is(are) online and set / reset the tracking bit as needed using diagnostics instructions like DEVICESTATES or MODULESTATES. Refer to: https://support.industry.siemens.com/cs/document/63877868
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