Ladder Program Execution - Omron ZEN Operation Manual

Executing Ladder Programs
ZEN executes up to 96 lines of a ladder program in one cycle from first to last line.
Starting from the first line of the bus bar, the ZEN repeatedly executes each line from left
to right.
I0 I1
0
Q0
1
I3
2
I4
3
T0
4
Repeatedly
Bus bar
executes in order
from bus bar.
Note
I0
00
M0
01
Appendix B

Ladder Program Execution

I2
[Q0
[Q1
TT0
[Q2
1. The time from when processing starts at the bus bar until the bus
bar is returned to at the first line again to execute the entire ladder
program is called cycle time.
2. The output ON/OFF results cannot be used for inputs within the
same cycle. The result scan be used from the next cycle onwards.
I0
[M0
M0
[Q0
Q0
1 cycle
The Q0 ON/OFF result is
reflected one cycle after MO
turns ON or OFF.
1 cycle
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