Omron ZEN Operation Manual page 155

Ladder Program Execution
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)/8-Digit Counters (F)
Display bits (D)
Weekly timers (@)
Calendar timers (*)
Analog comparators (A)
Comparators (P)
8-Digit Comparators (G)
Example Calculation of Ladder Program Execution Time
I0 I1
00
Q0
01
I3
02
I4
03
@0 P0
04
I2
[Q0
[Q1
TT0
T0
[Q2
30 µ s: Line containing
program
7 µ s: Empty lines
4 µ s
15 µ s
13 µ s
Hour and minute (CLK)/Year
and month (DAT)/Month and
day (DAT1): 21 µ s
Timers (T)/Holding timers
(#)/Counters (C)/Analog
comparators: 28 µ s
Characters (CHR)/8-Digit
Counters (F): 38 µ s
4 µ s
1 µ s
3 µ s
7 µ s
4 µ s
Ladder program execution time =
(30 × 5) + (4 × 3) + 15 + 4 + 7 = 188 ( µ s)
*1: For 5 lines
Appendix B
*5: P0
*4: @0
*3: T0 (output)
*2: Q (outputs) for 3 points
*1
*2
*3
*4
*5
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