SoftwareJanitor
Member
Again, my apologies. Been asked to become the "PLC Guy" here ...
This is a pollution control system that (now) runs a redundant PLC set-up.
Can this app be reloaded transparently so that the program executes seamlessly? Doesn't redundancy provide such capability?
My concern is upon download, the program will momentarily go to zero, causing the valves to change state, and then the Operator will have to re-select the previous mode to re-establish the previous fume exhaust path.
And until that is done, which in theory should only take as long as it takes for the program to reload and the selection re-made, the fumes could be exhausting to atmosphere (although they are coming from another device which has actually processed them).
So (I *think*) the exhaust path is just going to be diverted temporarily, but I'd rather this not happen if it can be avoided.
This is a pollution control system that (now) runs a redundant PLC set-up.
Can this app be reloaded transparently so that the program executes seamlessly? Doesn't redundancy provide such capability?
My concern is upon download, the program will momentarily go to zero, causing the valves to change state, and then the Operator will have to re-select the previous mode to re-establish the previous fume exhaust path.
And until that is done, which in theory should only take as long as it takes for the program to reload and the selection re-made, the fumes could be exhausting to atmosphere (although they are coming from another device which has actually processed them).
So (I *think*) the exhaust path is just going to be diverted temporarily, but I'd rather this not happen if it can be avoided.