There are many advantages of PLCs. But some of the main ones are as follows:
The control software is stored locally, so in the event of a building energy management system failure, the PLC can carry on.
The connections between the PLC inputs and outputs are made by the software and not by lots of physical wires.
PLC installations are smaller than hard wired relay banks, but can still use relays where needed
PLC’s are much easier to reprogramme.
Fault finding is easier and faster
You can load the same programme onto multiple PLC units to save time
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