Omron ZEN Operation Manual page 145

Ladder Program Execution
Ladder Program Execution Time
Refer to the following table for ZEN execution times. The execution times are provided
as a guide. External factors, button operations, execution of ZEN Support Software oper-
ations, and timing of the processing affects the actual processing times. The cycle time
is the sum of the common processing time, the processing time taken when Expansion I/
O Units are connected, and the ladder program execution time.
Common Processing Time
Model
ZEN-10C1AR-A 0.85 ms
ZEN-10C1DR-D
ZEN-10C2AR-A 0.2 ms
ZEN-10C2DR-D
Expansion I/O Unit Processing Time
0.15 ms/per Expansion I/O Unit.
Ladder Program Execution Time
Per line
Per output CPU Unit output bits (Q)
Expansion I/O Unit output bits (Y)
Work bits (M)
Holding bits (H)
Timers (T)/Holding timers (#)
Counters (C)
Display bits (D)
Weekly timers (@); per input
Calendar timers (*); per input
Analog comparators (A); per input)
Comparators (P); per input
Example Calculation of Ladder Program Execution Time
I0 I1
00
Q0
01
I3
02
I4
03
@0 P0
04
122
Common
processing
time
I2
[Q0
[Q1
TT0
T0
[Q2
25 µ s
4 µ s
15 µ s
10 µ s
25 µ s
3 µ s
2 µ s
1 µ s
15 µ s
Ladder program execution time =
(25 × 5) + (4 × 3) + 15 + 3 + 15 = 170 ( µ s)
*1: For 5 lines
Appendix C
*1
*2
*3
*4
*5
*5: P0
*4: @0
*3: T0 (output)
*2: Q (outputs) for 3 points