Function Block Instance Execution Time - Omron CX-PROGRAMMER V8.1 Operation Manual

Number of Function Block Program Steps and Instance Execution Time
2-9-2

Function Block Instance Execution Time

Contents
m Call part
n I/O parameter
transfer part
The data type is
shown in parenthe-
ses.
p Number of instruc-
tion steps in func-
tion block definition
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
When the program is written in ST language, the actual number of steps can-
not be calculated. The number of instruction steps in each function block defi-
nition can be found in the function block definition's properties.
This section applies only to CP-series CPU Units with unit version Ver. 1.0 or
later and CS/CJ-series CPU Units with unit version Ver. 3.0 or later, NSJ Con-
trollers, and FQM1 Flexible Motion Controllers.
Use the following equation to calculate the effect of instance execution on the
cycle time when function block definitions have been created and the
instances copied into the CPU Unit's user program.
Effect of Instance Execution on Cycle Time
= Startup time (A)
+ I/O parameter transfer processing time (B)
+ Execution time of instructions in function block definition (C)
---
1-bit (BOOL) input vari-
able or output variable
1-word (INT, UINT, or
WORD) input variable or
output variable
2-word (DINT, UDINT,
DWORD, or REAL) input
variable or output variable
4-word (LINT, ULINT,
LWORD, or LREAL) input
variable or output variable
Input-output variables
The total number of instruction steps (same as standard
user program) + 27 steps.
Section 2-9
Number of steps
57 steps
6 steps
6 steps
6 steps
12 steps
18 steps
77