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Appendix B
Ladder Program Execution
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.
Note 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.
[Q0
[Q1
TT0
[Q2
0
1
2
3
4
I0 I1 I2
Q0
I3
I4
T0
Bus bar
Repeatedly
executes in order
from bus bar.
00
01
I0
[M0
[Q0
I0
M0
M0
Q0
1 cycle 1 cycle
The Q0 ON/OFF result is
reflected one cycle after MO
turns ON or OFF.
Z211-E1-03.book Page 129 Friday, November 21, 2008 10:38 AM
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