Eaton ELC-PB, Programming Manual

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EL C Pro g rammi ng Manu al
F o r m o r e i nf o r m a t i o n v i sit : w w w.eato n. co m MN05003003E
1-14
1.7 Correcting Ladder Diagram
There are many ways to accomplish your ladder logic. The list below displays methods for creating
ladder logic. Some methods will not work and others could be better. For each method that will not
work or could be better, there is a suggested improvement. Review the instructions for each
method. The improved method will shorten the number of instructions, saving memory and
improving the scan time.
Example 1:
Connect the block to the front to eliminate the ANB instruction. This simplifies the program and
improves processing speed
Instruction List
LD X0
LD X1
OR X2
X0 X1
X2
ANB
Ø
Instruction List
LD X1
OR X2
X0 X1
X2
AND X0
Example 2:
When an instruction is to be connected to a block, connect the instruction to the lower row to omit
the ORB instruction.
Instruction List
LD T0
LD X1
AND X2
T0
X1 X2
ORB
Ø
Instruction List
LD X1
AND X2
T0
X1
X2
OR T0