Hi,
I am having an issue with PLC programming / hardware.
Here is the setup:
I am supposed to program a PLC to control three outputs on an power supply (UPS). The outputs are controlled by three signals, where leaving them open keeps the outputs on.
The software runs a check, a timer and a couple of other things to check that the system is ready to shut down when the main power is lost, and ultimately shuts all three outputs off.
The issue is that the PLC itself is powered by the power supply, and when it shuts of the last output, the system resets, and starts all over again.
This is kind of obvious, as the PLC opens the contact when it looses power (and so turning the outputs on again).
I did not design the hardware of the system, and I do not have access to another power source.
But my question is, is this even solvable without one?
I have been thinking, and I cant think of any way this would work properly without having power to the control system (the PLC) all the time (the way the setup is now).
The power supply itself is the only thing that has access to its internal battery all the time, so I am guessing that the only other way is by modifying it to work a little differently.
Any ideas would be greatly appreciated.
I am having an issue with PLC programming / hardware.
Here is the setup:
I am supposed to program a PLC to control three outputs on an power supply (UPS). The outputs are controlled by three signals, where leaving them open keeps the outputs on.
The software runs a check, a timer and a couple of other things to check that the system is ready to shut down when the main power is lost, and ultimately shuts all three outputs off.
The issue is that the PLC itself is powered by the power supply, and when it shuts of the last output, the system resets, and starts all over again.
This is kind of obvious, as the PLC opens the contact when it looses power (and so turning the outputs on again).
I did not design the hardware of the system, and I do not have access to another power source.
But my question is, is this even solvable without one?
I have been thinking, and I cant think of any way this would work properly without having power to the control system (the PLC) all the time (the way the setup is now).
The power supply itself is the only thing that has access to its internal battery all the time, so I am guessing that the only other way is by modifying it to work a little differently.
Any ideas would be greatly appreciated.
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