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9 Sequence BLOCK
This chapter mainly introduces sequence block instruction and the application.
Sequence Block instruction:
9-1 Concept of the BLOCK
Sequence block whose brief name is BLOCK is a program block to realize some functions.
As a special flow, all instructions in the block are executed in order, which is the biggest
difference with general processes.
BLOCK starts from SBLOCK and ends with SBLOCKE, and programmers can write
instructions in the BLOCK. If one BLOCK contains multiple pulse output instructions(or
other instructions), then pulse output instructions will execute in accordance with conditions
meet order; And meanwhile the next pulse output instruction will not execute until the current
instruction is over.
The XD3, XDM series PLC supports multiple BLOCKs
※1
.
A complete BLOCK structure is shown as below:
All instructions in
BLOCK is executed in
order
Instruction
Pulse output
Read write module
G code
Wait instruction
Command list
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