Experimental Physics and
Industrial Control System

Dear EPICS expert,

for motor control with a sequence software I have the following PVs:

record(ao, "myPV1"){

}

record(seq,"mySequence"){

     field(DLY1,"0")

     field(DOL1,"myPV1 CP")

     field(LNK1,"mySetPoint PP")

     field(DLY2,"0.5")

     field(DOL2,"1")

     field(LNK2,"myCommand PP")

}

myPV1 is the destination i want to reach, each time I change it, it process this sequence to set the destination in mySetPoint, and 0.5s later to activate the command. It works well most of the time. But yesterday sometimes, myPV1 was changed but mySequence was not processed .... it causes the whole sequence (emittance measurement) to get stuck. It can be unstuck by processing "mySequence" but it's a long sequence and we don't stay in front of the computer.

This morning we have rebooted the IOC, and the same problem occured but since maybe 1 hour it work very well.

Anyone have an idea why is it occuring ?

EPICS version is 3.15.4

Thanks a lot for your consideration

Alexis Gaget

CEA Saclay