Hello all,
I am working on an old machine that has a hydraulic filter that must be replaced every so often.
When the filter needs changing, a signal input comes back to my PLC.
Once the signal is present, only the resetting of the physical device in the filter housing will reset the signal. so far so good.
Now, I want to have a 50hr countdown on that. After 50 hrs, the machine will stop working if no-one has done the filter.
After the signal is reset, and the warning message acknowledged on the HMI, the timer is reset and does not start again until the next time the signal comes.
However, the machine gets turned off every night and the power cycling kills and resets my 50hr timer.
How do I get a non-volatile countdown timer? Or is there a better way to do it?
Omron CP1L-E
I am working on an old machine that has a hydraulic filter that must be replaced every so often.
When the filter needs changing, a signal input comes back to my PLC.
Once the signal is present, only the resetting of the physical device in the filter housing will reset the signal. so far so good.
Now, I want to have a 50hr countdown on that. After 50 hrs, the machine will stop working if no-one has done the filter.
After the signal is reset, and the warning message acknowledged on the HMI, the timer is reset and does not start again until the next time the signal comes.
However, the machine gets turned off every night and the power cycling kills and resets my 50hr timer.
How do I get a non-volatile countdown timer? Or is there a better way to do it?
Omron CP1L-E
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