Omron SYSMAC CJ - REFERENCE MANUAL 01-2008 Reference Manual page 1352

CJ-series Instruction Execution Times and Number of Steps
Note
4-2-1 Sequence Input Instructions
Instruction Mne- Code Length
monic
LOAD LD ---
!LD ---
LOAD NOT LD NOT ---
!LD NOT ---
AND AND ---
!AND ---
Execution times for most instructions differ depending on the CPU Unit used
(CJ1H-CPU6@H-R,
andCJ1G-CPU4@) and the conditions when the instruction is executed. The
top line for each instruction in the following table shows the minimum time
required to process the instruction and the necessary execution conditions,
and the bottom line shows the maximum time and execution conditions
required to process the instruction.
The execution time can also vary when the execution condition is OFF.
The following table also lists the length of each instruction in the Length
(steps) column. The number of steps required in the user program area for
each of the CJ-series instructions varies from 1 to 7 steps, depending upon
the instruction and the operands used with it. The number of steps in a pro-
gram is not the same as the number of instructions.
1. Program capacity for CJ-series PLCs is measured in steps, whereas pro-
gram capacity for previous OMRON PLCs, such as the C-series and CV-
series PLCs, was measured in words. Basically speaking, 1 step is equiv-
alent to 1 word. The amount of memory required for each instruction, how-
ever, is different for some of the CJ-series instructions, and inaccuracies
will occur if the capacity of a user program for another PLC is converted for
a CJ-series PLC based on the assumption that 1 word is 1 step. Refer to
the information at the end of 4-1 CS-series Instruction Execution Times
and Number of Steps for guidelines on converting program capacities from
previous OMRON PLCs.
2. Most instructions are supported in differentiated form (indicated with , ,
@, and %). Specifying differentiation will increase the execution times by
the following amounts.
Symbol
CPU6@H-R
or +0.24 s
@ or % +0.24 s
3. Use the following times as guidelines when instructions are not executed.
CPU6@H-R CPU6@H
Approx.
0.1 s
ON execution time ( s)
(steps)
CPU6@ CPU6@
H-R H
1 0.016 0.02
2 +21.14 +21.14
1 0.016 0.02
2 +21.14 +21.14
1 0.016 0.02
2 +21.14 +21.14
CJ1H-CPU6@H, CJ1H-CPU4@H,
CJ1-H
CPU6@H CPU4@H
+0.24 s +0.32 s
+0.24 s +0.32 s
CJ1-H
CPU4@H
Approx. Approx.
0.1 s 0.2 s
CPU4@ CPU4@ CJ1M
H exclud-
ing
CPU11/
21
0.04 0.08 0.10
+21.16 +21.16 +24.10
0.04 008 0.10
+21.16 +21.16 +24.10
0.04 0.08 0.10
+21.16 +21.16 +24.10
Section 4-2
CJ1M-CPU@@
CJ1M CJ1
CPU@@ CPU4@
+0.5 s +0.45 s
+0.5 s +0.33 s
CJ1M CJ1
CPU@@ CPU4@
Approx. 0.2 Approx. 0.2
to 0.5 s to 0.4 s
Conditions
CJ1M
CPU11/
21
0.10 ---
+28.07 Increase for immedi-
ate refresh
0.10 ---
+28.07 Increase for immedi-
ate refresh
0.10 ---
+28.07 Increase for immedi-
ate refresh
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