Attached is a trend of the corner EtherCAT Device0 channels while there was a broken module on 11/26, see alog 31854. The error can be seen in the ERROR_FLAG, SLAVE_COUNTERROR and the FRAMEWORKINGCNTs. The SLAVECOUNTACTUAL dropped from 345 to below 50—indicating a broken link or module.

On Nov 1 chassis 3 was pulled for some repairs, see alog 31081. The Device0 channels showed similar behavior.

On Nov 15 the power supply was changed for the baffled PD controllers, see alog 31509. This temporarily removed 4 modules from the EtherCAT chain. Again, we can see this clearly in the Device0 channels.

The last plot shows frame rates. Most frames seem to be lost during the above repairs and modifications.

No errors were detected in the end stations.