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Instruction Execution Times and Number of Steps Section 4-1
4-1 Instruction Execution Times and Number of Steps
The following table lists the execution times for all instructions that are avail-
able for CP 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 depend the conditions when the instruc-
tion is executed. The execution time is also required when the execution con-
dition 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 CP-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 is measured in steps. Basically speaking, 1 step is
equivalent to 1 word. (Program capacity for previous OMRON PLCs was
measured in words.)
(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.
(4) When converting programs from previous models of PLC (C-series or
CV/CVM1-series) to a CP-series PLC, the following guidelines can be
used to convert the program size from words to steps. Add the values (n)
given in the following table for each instruction to calculate the CP-series
program size in steps. Conversion is not necessary when converting pro-
grams from CS/CJ-series PLCs (i.e., the sizes will not change).
Symbol CP1H CPU Unit CP1L CPU Unit
↑ or ↓ +0.24 µs +4.82 µs
@ or % +0.24 µs +3.04 µs
CP1H CPU Unit CP1L CPU Unit
Approx. 0.1 µs Approx. 0.1 µs
Previous size in “a” words - CP1H size in “a+n” steps
Instruction
type
Instruction
options
Value of “n”
when converting
C-series PLC to
CP-series PLC
Value of “n”
when converting
CV/CVM1-series
PLC to CP-series
PLC
Basic instruc-
tions
None −1 for OUT, SET,
RESET, and KEEP
0 for all other
instructions
0
Upward differentia-
tion
0+1
Immediate refresh-
ing
--- 0
Upward differentia-
tion and immediate
refreshing
--- +2
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