Omron CJ - PROGRAMMING MANUAL 12-2009 - I;O Instruction Timing

39
Basic Concepts Section 2-1
condition (power flow stops) when results switch from ON to OFF. The
execution condition will turn ON the next cycle.
■ Timing Chart
2-1-9 I/O Instruction Timing
The following timing chart shows different operating timing for individual
instructions using a program comprised of only LD and OUT instructions.
Downwardly differentiated input instruction
Example
OFF execution condition created for one
cycle only when CIO 00103 goes from
ON to OFF.
0001
03
Bit A
Bit A
Bit B
Bit B
1 cycle
A
A
A
A
A
A
A
A
A
B1
B2
B3
B4
B5
B6
B7
B8
B9
B10
A
A
B11
B12
!
!
!
!
A
!
!
!
!
!
!
I/O refresh
Instruction
executed.
CPU pro-
cessing
Input read
Input
read
Input
read
Input
read
Input
read
Input
read
Input
read
Input
read
Input
read
Input
read
Input
read
Input
read