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Sequence Instructions
3
SEQUENCE PROGRAMMING
POINT
(1) Ladders differ as shown below between when MPS, MRD and MPP are used and when they
are not used.
(2) Use the same number of MPS and MPP instructions. If they differ in the number of used
instructions, operation will be performed as described below.
1) If the MPS instructions are used more than MPP instructions, the ladder is changed and
the built-in PLC function performs operation according to the new ladder.
2) If the MPP instructions are used more than MPS instructions, that ladder block results in
a ladder creation error, and the built-in PLC function cannot perform normal operation.
Ladder using MPS, MRD and MPP Ladder not using MPS, MRD and MPP
Coding
Coding
When MPP is replaced by NOP
Before change
After change