We have a PCS7 / Simatic Batch system V7.1. We are experiencing unusual behaviour with our recipes whereby the recipes go into error with a lightning strike over the state that is in error. This is usually preceded by the following events in the WinCC jounal list:
'phase no longer allocated'
On clicking 'resume' on the state that was no longer allocated, the recipe runs away again with any problems.
This is happening randomly without any obvious reason.
Any ideas greatly appreciated.