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Define balanced supply and unbalanced supply.

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The cycle time of a PLC is the time it takes to 

 (a) read all the input signals. (b) read all the input signals, run the program and update outputs. (c) read an input signal. (d) check all the input signals against the program.  

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The cycle time of a PLC is the time it takes to read all the input signals, run the program and update outputs.

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