Hi experts,
In our current project we have a large Batch system (DeltaV V12.3.1) running on several reactors and requiring certain units to be acquired at certain intervals (defer). At the start of the batch some of these units are not already available / designated to the batch. We currently rely on the operator to use the unit selection prompt to select the proper unit to be used. This has caused some issues in the past due to operator selecting the wrong unit, which is understandable since we have so many units. We need to eliminate this human error.
I'm aware that we could use equipment train and downstream filtering + selection policies. This would solve this issue in some cases, but not all. We have several units which can supply media to several reactors, so it's not really a "train", more a ring. We also would not eliminate the error of the operator selecting the unit at the correct time. The unit might be a possible downstream unit, but would only be required later on (the unit might not already be sterile / filled). I've seen the selection policies (instead of using defer) combined with unit parameters (written to from MES by OPC) would timeout, causing the choice to be handled by the operator again. Is this timeout a configurable parameter? Maybe in the registry?
Our hope is that we can use our MES (WERUM PAS-X) system to update the Batch to allocate the correct unit at the appropriate time. Currently the MES system uses the campaign manager to start the batches. It was my understanding that once the batch is started, deferring a unit is no longer possible, and we would have to rely on the operator.
So, the question is:
Can we interface with the Batch Executive to allocate (defer) the correct unit at the correct time, allowing for the MES system to select the correct unit?
Regards,
Bart
In reply to Ion Paidiu:
In reply to Bart Van Looveren: