Sometimes............the PID DB reverts to default variables.
And today, after weeks of running just fine.........as in 3 or 4 weeks, I get this odd situation where the PID out is 100% but the pulse out is 0..........so I recompile and stand up sit down download and go online and then it was on with the output at 100%.
A few minutes latter I noticed the set point was lower than the PV and the analog output of the PID was zero but the pulse out was still 1!!!!!!.
I remember something I read about how you have to tell the PID to remember the settings in the DB that is supposed to be retentive anyway.
I need to see if I can find that, but why oh why would a PID get stuck on or off?
Or how could it?
If this is another Siemens "gotcha" I might have to break something.
I so hope I did something stupid.
And today, after weeks of running just fine.........as in 3 or 4 weeks, I get this odd situation where the PID out is 100% but the pulse out is 0..........so I recompile and stand up sit down download and go online and then it was on with the output at 100%.
A few minutes latter I noticed the set point was lower than the PV and the analog output of the PID was zero but the pulse out was still 1!!!!!!.
I remember something I read about how you have to tell the PID to remember the settings in the DB that is supposed to be retentive anyway.
I need to see if I can find that, but why oh why would a PID get stuck on or off?
Or how could it?
If this is another Siemens "gotcha" I might have to break something.
I so hope I did something stupid.
