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CJ-series Instruction Execution Times and Number of Steps
Section 4-2
4-2
CJ-series Instruction Execution Times and Number of
Steps
The following table lists the execution times for all instructions that are avail-
able for CJ PLCs.
The total execution time of instructions within one whole user program is the
process time for program execution when calculating the cycle time (See
note.).
Note User programs are allocated tasks that can be executed within cyclic tasks
and interrupt tasks that satisfy interrupt conditions.
Execution times for most instructions differ depending on the CPU Unit used
(CJ1H-CPU6
@
H, CJ1H-CPU4
@
H, CJ1M-CPU
@@
andCJ1G-CPU4
@
) and
the conditions when the instruction is executed. The top line for each instruc-
tion 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 instruc-
tion.
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.
Note
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.
3.
Use the following times as guidelines when instructions are not executed.
Symbol
CJ1-H
CJ1M
CJ1
CPU6
@
H
CPU4
@
H
CPU
@@
CPU4
@
↑
or
↓
+0.24
µ
s
+0.32
µ
s
+0.5
µ
s
+0.45
µ
s
@ or %
+0.24
µ
s
+0.32
µ
s
+0.5
µ
s
+0.33
µ
s
CJ1-H
CJ1M
CJ1
CPU6
@
H
CPU4
@
H
CPU
@@
CPU4
@
Approx. 0.1
µ
s
Approx. 0.2
µ
s
Approx. 0.2 to 0.5
µ
s Approx. 0.2 to 0.4
µ
s
Summary of Contents for CJ1G-CPUxx
Page 3: ...iv N o t i c e ...
Page 5: ...vi ...
Page 21: ...xxii Conformance to EC Directives 6 ...
Page 35: ......
Page 1131: ...1110 CJ series Instruction Execution Times and Number of Steps Section 4 2 ...