1 . P L C C o n c e p ts
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.
“Reverse current” exists
1.8 Correcting Ladder Diagram
Example 1:
Connect the block to the front for omitting ANB instruction because simplified program improves
processing speed
Instruction List
LD X0
LD X1
OR X2
X0
X1
X2
ANB
Instruction List
LD X1
OR X2
X0
X1
X2
AND X0
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