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MELSEC-Q/QnA
5 SEQUENCE INSTRUCTIONS
5. SEQUENCE INSTRUCTIONS
Sequence instructions include instructions for relay control ladders and the like. They are divided
into the following categories:
Instruction Meaning Reference
Contact instruction Operation start, series connection, parallel connection Chapter 5.1
Connection Instruction
Ladder block connection, creation of pulses from operation
results, store/read operation results
Chapter 5.2
Output instruction Bit device output, pulse output, output reversal Chapter 5.3
Shift instruction
Bit device shift
Chapter 5.4
Master control instruction Master control Chapter 5.5
Termination instruction Program termination Chapter 5.6
Other instructions
Program stop, instructions such as no operation which do not fit
in the above categories
Chapter 5.7
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