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Function Blocks
Section 1-5
1-5
Function Blocks
In the SYSMAC CP Series, function blocks can be used in programming just
as in the CS/CJ Series.
1-5-1
Overview of Function Blocks
A function block is a basic program element containing a standard processing
function that has been defined in advance. Once the function block has been
defined, the user just has to insert the function block in the program and set
the I/O in order to use the function.
As a standard processing function, a function block is not created with actual
physical addresses, but local variables. The user sets parameters (addresses
or values) in those variables to use the function block. The addresses used for
the variables themselves are automatically assigned by the system (CX-Pro-
grammer) each time they are placed in the program.
In particular, each function block is saved by the CX-Programmer as an indi-
vidual file that can be reused with programs for other PLCs. This makes it pos-
sible to create a library of standard processing functions.
1-5-2
Advantages of Function Blocks
Function blocks allow complex programming units to be reused easily. Once
standard program sections have been created as function blocks and saved in
files, they can be reused just by placing a function block in a program and set-
ting the parameters for the function block's I/O. Reusing standardized function
blocks reduces the time required for programming/debugging, reduces coding
errors, and makes programs easier to understand.
Structured
Programming
Structured programs created with function blocks have better design quality
and required less development time.
cc
aa
bb
#0000
MOV
dd
Standard program
section written
with variables
Function block A
Define in advance.
Insert in program.
Save function
block as file.
Library
Function
block A
Reuse
To another PLC program
Program 1
Copy of function block A
Input
Variable
Variable
Output
Setting
Setting
Copy of function block A
Input
Variable
Variable
Output
Program 2
Copy of function block A
Variable
Output
Summary of Contents for Sysmac CP1H
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Page 3: ...CP1H X40D CP1H XA40D CP1H Y20DT D CP1H CPU Unit Operation Manual Revised October 2014...
Page 4: ...iv...
Page 10: ...x...
Page 18: ...xviii...
Page 22: ...xxii...
Page 34: ...xxxiv Conformance to EC Directives 6...
Page 76: ...42 Function Blocks Section 1 5...
Page 176: ...142 CP series Expansion I O Unit Wiring Section 3 6...
Page 372: ...338 Analog I O XA CPU Units Section 5 5...
Page 578: ...544 Trouble Shooting Section 8 7...
Page 622: ...588 Sample Application Section 9 12 Network Settings Network Tab Network Settings Driver Tab...
Page 668: ...634 Standard Models Appendix A...
Page 744: ...710 Auxiliary Area Allocations by Address Appendix D...
Page 771: ...737 Connections to Serial Communications Option Boards Appendix F Connecting to Unit...
Page 772: ...738 Connections to Serial Communications Option Boards Appendix F...
Page 800: ...766 Specifications for External Power Supply Expansion Appendix H...
Page 806: ...772 Index W Work Area 165 work bits 165 work words 165 write protection 379...
Page 808: ...774 Revision History...
Page 809: ......