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Basic Concepts Section 2-1
• When a word operand is specified for an instruction, I/O will be refreshed
for the 16 bits that are specified.
• Inputs will be refreshed for input or source operand just before an instruc-
tion is executed.
• Outputs will be refreshed for outputs or destination (D) operands just after
an instruction is execute.
Add an exclamation mark (!) (immediate refresh option) in front of the instruc-
tion.
Units Refreshed for I/O REFRESH Instruction
Note C200H I/O Units cannot be mounted to CJ-series PLCs.
Location CPU or Expansion I/O Rack (but not SYSMAC BUS Slave Racks)
Units Basic I/O Units CS/CJ-series Basic I/O
Units
Refreshed
C200H Basic I/O Unit (See
note.)
Refreshed
C200H Group-2 High-den-
sity I/O Units (See note.)
Not refreshed
Special I/O Units Not refreshed
To p
.
.
.
!LD 000101
.
.
.
!OUT 000209
.
.
.
END
To p
.
.
.
!MOV 0003
0004
.
.
.
END
Input
Output
S
D
CIO 0001
CIO 0002
15 0
15 0
CIO 0003
CIO 0004
15 0
15 0
All real I/O
Immediate refresh
16-bit units
I/O refresh
Cyclic refresh
(batch processing)
16-bit units
I/O refresh
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