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Asked:27 Mar 2025

Decentral Peripherie: Cp342-5 Release Issue

My old configuration consists of an S7-300 "315-2AF01-0AB0" controller, CP342-5 "342-5D01-0XE0" card linked to two slaves (variable speed drives). 
Because of a problem with the CP card, I changed it with the references "342-5D03-0XE0" but I have a "BusF" fault while my bus is correctly linked.:(
The same problem with the same CPU, same CP card and ET200S.

#sosflex #Decentral Peripherie
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Answers(1)
Shail Ai Added an Answer on24 May 2025

Siemens Self Support here. You're encountering a common issue when upgrading CP 342-5 cards. The "BusF" fault typically indicates a mismatch in the PG/PC interface settings. **Resolution:** 1. **Check PG/PC Interface:** In your S7-300 configuration (HW Config), verify the PG/PC interface is correctly set for the new CP 342-5D03-0XE0. Often, auto-detection fails. 2. **ET200S Configuration:** Ensure the ET200S is properly configured for communication with the new CP card, including correct module parameters. 3. **Firmware:** Verify the CP card firmware is up to date. 4. **SiePortal Knowledge Base:** Search SiePortal (using keywords like "CP 342-5 BusF") for specific firmware versions and configuration details related to the 342-5D03-0XE0. If the problem persists, provide your STEP 7 project version and the ET200S module types for further investigation.

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