I/O Instruction Timing - Omron CJ - PROGRAMMING MANUAL 12-2009 Programming Manual

Basic Concepts
2-1-9

I/O Instruction Timing

A
A
A
A
!
A
!
A
A
A
A
A
!
A
!
A
condition (power flow stops) when results switch from ON to OFF. The
execution condition will turn ON the next cycle.
Downwardly differentiated input instruction
■
Timing Chart
Bit A
Bit A
Bit B
The following timing chart shows different operating timing for individual
instructions using a program comprised of only LD and OUT instructions.
B1 Input
read
Input
B2
read
B3
Input
B4
read
Input
B5
read
B6
Input
B7
read
!
Input
B8
read
!
B9
!
B10
!
B11
!
B12
!
CPU pro-
cessing
Instruction
I/O refresh
executed.
Example
0001
03
OFF execution condition created for one
cycle only when CIO 00103 goes from
ON to OFF.
Bit B
1 cycle
Input
read
Input
read
Input
read
Input
read
Input read
Input
read
Section 2-1
39