I/O Refresh Methods; Cyclic Refreshing; Immediate Refreshing - Omron CP1L-EL20DR-D Operation Manual

CPU Unit Operation
2-4-3

I/O Refresh Methods

1,2,3...

Cyclic Refreshing

Immediate Refreshing

Note
I/O for CPU Unit built-in I/O and I/O on CP-series Expansion Units and Expan-
sion I/O Units is performed at the following times.
1. Cyclic refresh period
2. When instructions with an immediate refresh variation are executed
3. When IORF(097) is executed
I/O is refreshed after all the instructions in executable tasks have been exe-
cuted.
END(001)
Cycle
END(001)
END(001)
I/O refresh period
When the immediate refreshing variation of an instruction is specified and the
instruction's operand is an input bit or word in the Built-in I/O Area, the word
containing the bit or the word itself will be refreshed.
Immediate refresh
!LD 0.00
!OUT 100.00
!MOV 1 101
(1) Immediate refreshing is possible only for the Built-in I/O Area. Use
IORF(097) for I/O on CP-series Expansion Units and Expansion I/O
Units.
(2) Refreshing Range
• Bit Operands
The ON/OFF status of the 16 I/O points allocated to the word contain-
ing the specified bit will be refreshed.
• Word Operands
The ON/OFF status of the 16 I/O points allocated to the specified word
will be refreshed.
(3) Refresh Timing
• Input or source operands are read just before the instruction is executed.
• Output or destination (results) operands are written just after the in-
struction is executed.
Section 2-4
Task
Task
Task
I/O terminal
status
I/O terminal status (built-in I/O)
15
11
CIO 0
15 7
CIO 100
15 11
CIO 1
7
CIO 101
0
0
0
53