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1. PLC Concepts
1-13
OR operation upward is not allowed.
Reverse current
“Reverse current” exists.
Output should be connected on top of the
circuit..
Block combination should be made on top of the
circuit..
Parallel connection with empty device is not
allowed..
Parallel connection with empty device is not
allowed.
No device in the middle block.
Devices and blocks in series should be
horizontally aligned
Label P0 should be at the first row of the
complete network.