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CS/CJ/NSJ Series Instructions Reference Manual (W474)
4. Instruction Execution Times and Number of Steps
4-2 CJ1 CPU Unit Instruction Execution Times and Number of Steps
4
4-2-35 Function Block Instance Execution Time
(CPU Units with Unit Version 3.0 or later)
Note The number of instruction steps in the function block definition (p) will
not be diminished in subsequence instances when the same function
block definition is copied to multiple locations (i.e., for multiple in-
stances). Therefore, in the above equation, the number of instances
is not multiplied by the number of instruction steps in the function
block definition (p).
Example:
Input variables with a 1-word data type (INT): 5
Output variables with a 1-word data type (INT): 5
Function block definition section: 100 steps
Number of steps for 1 instance = 57 + (5 + 5) × 6 steps + 100 steps + 27 steps
= 244 steps
Contents CS/CJ-series CPU Units
with unit version 3.0 or later
m Call part 57 steps
n I/O parameter
transfer part
The data type is
shown in parenthe-
ses.
1-bit (BOOL) input symbol
or output symbol
6 steps
1-word (INT, UINT,
WORD) input symbol or
output symbol
6 steps
2-word (DINT, UDINT,
DWORD, REAL) input
symbol or output symbol
6 steps
4-word (LINT, ULINT,
LWORD, LREAL) input
symbol or output symbol
18 steps
I/O symbols 6 steps
p Number of instruc-
tion steps in func-
tion block definition
The total number of instruction steps (same as standard
user program) + 27 steps.
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