End-stop drift and repeated motor failures on SMI network (WAGO 753-1630 + Vestamatic motors)

Hardware and Linux
1

Hi everyone,

I’m currently troubleshooting a Standard Motor Interface (SMI) network used for façade shading control.
We’ve seen several issues that are difficult to explain:

  • End stops on multiple SMI motors (from Vestamatic) change by themselves over time

  • Several motors have become defective or stop responding completely

  • Communication on the bus occasionally shows retries, invalid responses or timeouts

The cabling, topology and power supply are within spec, and there’s no obvious noise or grounding issue.
It seems like something in the communication or parameter handling is gradually corrupting motor memory (EEPROM).

System details:

  • Controller: WAGO PFC200 (firmware 13.x)

  • SMI master modules: WAGO 753-1630, HW 02, FW 01.01.27(06)

  • Motors: Vestamatic SMI 230 V drives (latest batch)

  • Line length: ~80 m, up to 16 motors per line

Has anyone here experienced similar behaviour on SMI networks?
For example: end-stop drift, EEPROM corruption, or a growing number of failed motors over time?

Any insights, test ideas, or experience from field setups would be much appreciated.