7
Introducing the Function Blocks Section 1-1
Note The structured text (ST language) conforms to the IEC 61131-3 standard, but
CX-Programmer Ver. 5.0 supports only assignment statements, selection
statements (CASE and IF statements), iteration statements (FOR, WHILE,
REPEAT, and EXIT statements), RETURN statements, arithmetic operators,
logical operators, comparison functions, numeric functions, standard string
functions, numeric string functions, OMRON expansion functions, and com-
ments. For details, refer to SECTION 5 Structured Text (ST) Language Speci-
fications in Part 2: Structured Text (ST).
Functions not
supported by
CX-Program-
mer Ver. 4.0
or earlier.
Defining
and creat-
ing func-
tion blocks
Variables Variable names 30,000 characters max.
Variable types Input variables (Inputs), output variables (Out-
puts), input-output variables (In Out), internal
variables (Internals), and external variables
(Externals)
Number of variables used in
a function block
(not including internal vari-
ables, external variables,
EN, and EN0)
Maximum number of variables per function block
definition
• Input-output variables: 16 max.
• Input variables + input-output variables: 64 max.
• Output variables + input-output variables: 64
max.
Allocation of addresses
used by variables
Automatic allocation (The allocation range can be
set by the user.)
Actual address specification Supported
Array specifications Supported (one-dimensional arrays only and only
for internal variables and input-output variables)
Language Function blocks can be created in ladder programming language or structured
text (ST, see note).
Creating
instances
Number of
instances
CJ2H Units:
• CJ2H-CPU6@(-EIP): 2,048 max. per CPU Unit
CS1-H/CJ1-H CPU Units:
• Suffix -CPU44H/45H/64H/65H/66H/67H/64H-R/65H-R/66H-R/67H-R: 2,048
max. per CPU Unit
• Suffix -CPU42H/43H/63H: 256 max. per CPU Unit
CJ1M CPU Units:
• CJ1M-CPU11/12/13/21/22/23: 256 max. per CPU Unit
CP1H CPU Units:
• All models: 256 max. per CPU Unit
CP1L CPU Units:
• CP1L-M/L: 256 max. per CPU Unit
NSJ Controllers:
•SJ@-@@@@-G5D: 2,048 max. per Controller;
NSJ@-@@@@-M3D: 256 max. per Controller
FQM1 Flexible Motion Controllers:
• FQM1-CM002/MMA22/MMP22: 256 max. per Controller
Instance
names
15,000 characters max.
Storing
function
blocks as
files
Project files The project file (.cxp/cxt) Includes function block definitions and instances.
Program
files
The file memory program file (*.obj) includes function block definitions and
instances.
Function
block library
files
Each function block definition can be stored as a single file (.cxf) for reuse in
other projects.
Item Specifications
To Next Page
Loading...
Need help?
General