Omron WS02-CXPC1-V8 - V8.1 REV 02-2009 User manual

Operation Manual
SFC Programming
SYSMAC
WS02-CXPC1-V8
CX-Programmer Ver. 8.1
Cat. No. W469-E1-04

ii
CX-Programmer Ver. 8.1
WS02-CXPC1-V8
Operation Manual
SFC Programming
Revised February 2009

iii
TABLE OF CONTENTS
About this Manual: ...................................................................................................................................................v
Read and Understand this Manual ..........................................................................................................................vi
Warranty and Limitations of Liability .....................................................................................................................vi
Application Considerations ....................................................................................................................................vii
Disclaimers............................................................................................................................................................viii
SECTION 1 Overview......................................................................... 1
1-1 SFC Overview..................................................................................................................................................2
1-2 CX-Programmer Specifications........................................................................................................................6
1-3 Window Components.......................................................................................................................................8
1-4 SFC Programming Example...........................................................................................................................27
1-5 Precautions When Creating SFC Programs....................................................................................................33
SECTION 2 SFC Fundamentals....................................................... 41
2-1 SFC Basic Operation......................................................................................................................................42
2-2 Basic SFC Execution Cycle............................................................................................................................43
2-3 Elements of SFC.............................................................................................................................................44
SECTION 3 Offline Operations ....................................................... 63
3-1 Creating an SFC Program...............................................................................................................................64
3-2 Editing the SFC Chart ....................................................................................................................................67
3-3 Searching and Replacing within an SFC Chart ..............................................................................................88
3-4 Offline Program Check...................................................................................................................................90
3-5 Miscellaneous.................................................................................................................................................91
SECTION 4 Online Operations........................................................ 93
4-1 Connecting the PLC .......................................................................................................................................94
4-2 Transferring Programs from Computer to PLC..............................................................................................95
4-3 Transferring Programs from PLC to Computer..............................................................................................96
4-4 Comparing Programs......................................................................................................................................97
4-5 Monitoring......................................................................................................................................................98
SECTION 5 Debug Operations ...................................................... 103
5-1 Online Editing ..............................................................................................................................................104
5-2 Force Setting/Force-Resetting......................................................................................................................113
5-3 Set Step Timer Value....................................................................................................................................115
5-4 Work Online Simulator ................................................................................................................................116

iv
Appendix A.........................................................................................117
Specifications for Step Control Instructions......................................................................................................... 117
Appendix B .........................................................................................123
SFC Task Control Instruction Specifications ....................................................................................................... 123
Appendix C.........................................................................................128
SFC Program Size and Execution Time ............................................................................................................... 128
Index....................................................................................................131
Revision History .................................................................................135

v
About this Manual:
SFC programming functions have been added to the CX-Programmer. This manual describes the
specifications of the SFC language, and the CX-Programmer operations related to the SFC
programming functions. For operations not related to SFC programming, refer to the
CX-Programmer Operation Manual (Cat. No. W446).
For details on operations related to function blocks and structured text, refer to the CX-Programmer
Operation Manual Function Blocks/Structured Texts (Cat. No. W447).
Intended Audience
This manual is intended for the following personnel, who must also have knowledge of electrical
systems (an electrical engineer or the equivalent).
•Personnel in charge of installing FA systems.
•Personnel in charge of designing FA systems.
•Personnel in charge of managing FA systems and facilities.
Caution Please read this manual and related manuals carefully and be sure you understand
the information provided before attempting to install or operate the CX-Programmer,
the CJ2 Units with unit version 1.0 or later, or the CS1-H, CJ1-H, or CJ1M CPU Units
with unit version 4.0 or later. Be sure to read the precautions provided in the following
section.

vi
Read and Understand this Manual
Please read and understand this manual before using the product. Please consult your OMRON
representative if you have any questions or comments.
Warranty and Limitations of Liability
WARRANTY
(1) The warranty period for the Software is one year from either the date of purchase or the date
on which the Software is delivered to the specified location.
(2) If the User discovers a defect in the Software (i.e., substantial non-conformity with the
manual), and returns it to OMRON within the above warranty period, OMRON will replace the
Software without charge by offering media or downloading services from the Internet. And if
the User discovers a defect in the media which is attributable to OMRON and returns the
Software to OMRON within the above warranty period, OMRON will replace the defective media
without charge. If OMRON is unable to replace the defective media or correct the Software, the
liability of OMRON and the User’s remedy shall be limited to a refund of the license fee paid to
OMRON for the Software.
LIMITATIONS OF LIABILITY
(1) THE ABOVE WARRANTY SHALL CONSTITUTE THE USER’S SOLE AND EXCLUSIVE
REMEDIES AGAINST OMRON AND THERE ARE NO OTHER WARRANTIES, EXPRESSED OR
IMPLIED, INCLUDING BUT NOT LIMITED TO, WARRANTY OF MERCHANTABILITY OR FITNESS
FOR A PARTICULAR PURPOSE. IN NO EVENT WILL OMRON BE LIABLE FOR ANY LOST
PROFITS OR OTHER INDIRECT, INCIDENTAL, SPECIAL, OR CONSEQUENTIAL DAMAGES
ARISING OUT OF USE OF THE SOFTWARE.
(2) OMRON SHALL ASSUME NO LIABILITY FOR DEFECTS IN THE SOFTWARE BASED ON
MODIFICATION OR ALTERATION OF THE SOFTWARE BY THE USER OR ANY THIRD PARTY.
(3) OMRON SHALL ASSUME NO LIABILITY FOR SOFTWARE DEVELOPED BY THE USER OR ANY
THIRD PARTY BASED ON THE SOFTWARE OR ANY CONSEQUENCE THEREOF.

vii
Application Considerations
SUITABILITY FOR USE
THE USER SHALL NOT USE THE SOFTWARE FOR A PURPOSE THAT IS NOT DESCRIBED IN THE
ATTACHED USER MANUAL.

viii
Disclaimers
CHANGE IN SPECIFICATIONS
The software specifications and accessories may be changed at any time based on improvements
or for other reasons.
EXTENT OF SERVICE
The license fee of the Software does not include service costs, such as dispatching technical
staff.
ERRORS AND OMISSIONS
The information in this manual has been carefully checked and is believed to be accurate;
however, no responsibility is assumed for clerical, typographical, or proofreading errors, or
omissions.

ix
Manuals Related to the CX-Programmer
Name Cat. No. Contents
SYSMAC WS02-CXPC1-V8
CX-Programmer Operation Manual: SFC
W469
(this
manual)
Explains how to use the SFC programming functions.
For explanations of other shared CX-Programmer
functions, refer to the CX-Programmer Operation
Manual (W446).
SYSMAC WS02-CXPC1-V8
CX-Programmer Ver. 8.1 Operation
Manual
Function Blocks/Structured Texts
W447
Describes the function block functions and structured
text programming functions that can be used with the
CX-Programmer version 8.1. For details onother
CX-Programmer functions, refer to the
CX-Programmer Ver. 8.1 Operation Manual (Cat. No.
W446).
SYSMAC WS02-CXPC1-V8
CX-Programmer Ver. 8.1 Operation
Manual
W446 Describes the general CX-Programmer version 8.1
operations that are not specifically related to SFC
programming, function block functions, and structured
text programming functions.
CX-Integrator Operation Manual
CXONE-AL@@C-V3
CXONE-AL@@D-V3
W464 Describes operating procedures for the CX-Integrator
Network Configuration Tool for CS-, CJ-, CP-, and
NSJ-series Controllers.
CX-One Setup Manual
CXONE-AL@@C-V3
CXONE-AL@@D-V3
W463 Installation and overview of CX-One FA Integrated
Tool Package.

x
Manuals Related to the CJ2, CS1-H, CJ1-H, CJ1M PLCs
Name Cat. No. Contents
SYSMAC CJ Series
CJ2H-CPU6@-EIP, CJ2H-CPU6@
Programmable Controllers
Hardware User’s Manual
W472 Provides an outline of and describes the design,
installation, maintenance, and other basic operations for
the CJ-series CJ2 CPU Units.
The following information is included:
Overview and features
System configuration
Installation and wiring
Troubleshooting
Use this manual together with the W473.
SYSMAC CJ Series
CJ2H-CPU6@-EIP, CJ2H-CPU6@
Programmable Controllers
Software User’s Manual
W473 Describes programming and other methods to use the
functions of the CJ2 CPU Units.
The following information is included:
CPU Unit operation
Internal memory areas
Programming
Tasks
CPU Unit built-in functions
Use this manual together with the W472.
SYSMAC CS/CJ Series
CS1G/H-CPU@@-EV1, CS1G/H-CPU@@H,
CS1D-CPU@@H, CS1D-CPU@@S,
CJ2H-CPU6@-EIP, CJ2H-CPU6@,
CJ1H-CPU@@H-R
CJ1G-CPU@@, CJ1G/H-CPU@@H,
CJ1G-CPU@@P, CJ1M-CPU@@
SYSMAC One NSJ Series
NSJ@-@@@@ (B)-G5D
NSJ@-@@@@ (B)-M3D
Programmable Controllers
Instructions Reference Manual
W474 Describes the ladder diagram programming instructions
supported by CS/CJ-series or NSJ-series PLCs.
When programming, use this manual together with the
Operation Manual or Hardware User’s Manual (CS1:
W339, CJ1: W393,or CJ2:W472) and Programming
Manual or Software User’s Manual (CS1/CJ1:W394 or
CJ2:W473).
SYSMAC CS Series
CS1G/H-CPU@@-EV1, CS1G/H-CPU@@H
Programmable Controllers
Operation Manual
W339 Provides an outline of and describes the design,
installation, maintenance, and other basic operations for
the CS-series PLCs.
The following information is included:
An overview and features
The system configuration
Installation and wiring
I/O memory allocation
Troubleshooting
Use this manual together with the W394.
SYSMAC CJ Series
CJ1G-CPU@@, CJ1G/H-CPU@@H,
CJ1G-CPU@@ P, CJ1M-CPU@@
Programmable Controllers
Operation Manual
W393 Provides an outline of and describes the design,
installation, maintenance, and other basic operations for
the CJ-series PLCs.
The following information is included:
An overview and features
The system configuration
Installation and wiring
I/O memory allocation
Troubleshooting
Use this manual together with the W394.
SYSMAC CS/CJ Series
CS1G/H-CPU@@-EV1, CS1G/H-CPU@@H,
CJ1G-CPU@@, CJ1G/H-CPU@@H,
CJ1G-CPU@@P, CJ1M-CPU@@
Programmable Controllers
Programming Manual
W394 Describes programming and other methods to use the
functions of the CS/CJ-series PLCs.
The following information is included:
Programming
Tasks
File memory
Other functions
Use this manual together with the W339 or W393.

xi
Name Cat. No. Contents
SYSMAC CS/CJ Series
CS1G/H-CPU@@ -EV1, CS1G/H-CPU@@H,
CJ1G-CPU@@, CJ1G/H-CPU@@H,
CJ1G-CPU@@P, CJ1M-CPU@@
Programmable Controllers
Instructions Reference Manual
W340 Describes the ladder diagram programming instructions
supported by CS/CJ-series PLCs.
When programming, use this manual together with the
Operation Manual (CS1: W339 or CJ1: W393) and
Programming Manual (Cat. No. W394).
SYSMAC CS/CJ Series
CS1G/H-CPU@@-EV1, CS1G/H-CPU@@H,
CS1W-SCB21-V1/41-V1, CS1W-SCU21/41,
CJ2H-CPU6@-EIP, CJ2H-CPU6@,
CJ1G-CPU@@, CJ1G/H-CPU@@H,
CJ1G-CPU@@P, CJ1M-CPU@@,
CJ1W-SCU21-V1/41-V1
Communications Commands
Reference Manual
W342 Describes the communications commands that can be
addressed to CS/CJ-series CPU Units.
The following information is included:
C-series (Host Link) commands
FINS commands
Note: This manual describes commands that can be sent
to the CPU Unit without regard for the
communications path, which can be through a
serial communications port on the CPU Unit, a
communications port on a Serial Communications
Unit/Board, or a port on any other
Communications Unit.

xii
Notice:
OMRON products are manufactured for use according to proper procedures by a qualified operator
and only for the purposes described in this manual.
The following conventions are used to indicate and classify precautions in this manual. Always heed
the information provided with them. Failure to heed precautions can result in injury to people or
damage to property.
DANGER Indicates an imminently hazardous situation which, if not avoided, will result in death
or serious injury. Additionally, there may be severe property damage.
WARNING Indicates a potentially hazardous situation which, if not avoided, could result in death
or serious injury. Additionally, there may be severe property damage.
Caution Indicates a potentially hazardous situation which, if not avoided, may result in minor or
moderate injury, or property damage.

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WARNING Confirm safety thoroughly in advance when using the CX-Programmer to transfer any
I/O memory data to the actual PLC. Changes to the PLC’s I/O memory may result in
unexpected operation of devices connected to Output Units, regardless of the PLC’s
operating mode.
The following functions require particular caution when using the CX-Programmer to
transfer data to the CPU Unit’s I/O memory.
•Transferring data from the CX-Programmer to the CPU Unit’s CIO Area (with the
PLC Memory Window function)
•Transferring data from a Memory Card or EM file memory to the CPU Unit's CIO
Area (with the Memory Card Window function)
Caution Confirm safety at the destination node before transferring a program to another node
or changing contents of the I/O memory area. Doing either of these without confirming
safety may result in injury.
Caution Execute online editing only after confirming that no adverse effects will be caused by
extending the cycle time. Otherwise, the input signals may not be readable.

xiv
Application Precautions
Observe the following precautions when using the CX-Programmer’s SFC functions.
• As a rule, the outputs of actions are reset when a step is changed from active status to
inactive status. When changing an output’s hold/reset setting, change the initial
setting or add reset processing as necessary. When making changes, verify the
operational timing of actions in the preceding and following steps.
Note: Refer to 1-5-1 Holding or Resetting an Action's Outputs and 1-5-2 Action Program
Precautions for details.
• Observe the following precautions before starting the CX-Programmer.
• Exit all applications not directly related to the CX-Programmer. Particularly exit
any software such as screen savers, virus checkers, E-mail or other
communications software, and schedulers or other applications that start up
periodically or automatically.
• Disable sharing hard disks, printers, or other devices with other computers on any
network.
• With some notebook computers, the RS-232C port is allocated to a modem or an
infrared line by default. Following the instructions in documentation for your
computer and enable using the RS-232C port as a normal serial port.
• With some notebook computers, the default settings for saving energy do not
supply the rated power to the RS-232C port. There may be both Windows settings
for saving energy, as well as setting for specific computer utilities and the BIOS.
Following the instructions in documentation for your computer, disable all energy
saving settings.
• Do not turn OFF the power supply to the PLC or disconnect the connecting cable
while the CX-Programmer is online with the PLC. The computer may malfunction.
• Confirm that no adverse effects will occur in the system before attempting any of the
following. Not doing so may result in an unexpected operation.
• Changing the operating mode of the PLC.
• Force-setting/force-resetting any bit in memory.
• Changing the present value of any word or any set value in memory.
• Check the user program for proper execution before actually running it on the Unit.
Not checking the program may result in an unexpected operation.
• When online editing is performed, the user program and parameter area data in CJ2,
CS1-H, CJ1-H, CJ1M, and CP1H CPU Units is backed up in the built-in flash memory.
The BKUP indicator will light on the front of the CPU Unit when the backup operation
is in progress. Do not turn OFF the power supply to the CPU Unit when the BKUP
indicator is lit. The data will not be backed up if power is turned OFF. To display the
status of writing to flash memory on the CX-Programmer, select Display dialog to
show PLC Memory Backup Status in the PLC properties and then select Windows –
PLC Memory Backup Status from the View Menu.

xv
Instructions for Use
Do not turn OFF the power supply to the computer while installing or uninstalling the
CX-Programmer. The data in a computer may be corrupted.
Description of Programmable Controllers
The abbreviation “PLC” means Programmable Controller. “PC” is used, however, in
some Programming Device displays to mean Programmable Controller.

1
SECTION 1
Overview
1-1 SFC Overview.............................................................................................................2
1-1-1 SFC Overview...................................................................................................................2
1-1-2 CX-Programmer Features .................................................................................................3
1-2 CX-Programmer Specifications...................................................................................6
1-2-1 PLC Models Supporting SFC............................................................................................6
1-2-2 Specifications....................................................................................................................6
1-3 Window Components..................................................................................................8
1-3-1 SFC Editor ........................................................................................................................8
1-3-2 Menus..............................................................................................................................11
1-3-3 SFC Editor Pop-up Menu................................................................................................14
1-3-4 Toolbar Icons ..................................................................................................................21
1-3-5 Keyboard Shortcuts.........................................................................................................22
1-3-6 Environmental Settings Unique to the SFC Programming Functions.............................23
1-4 SFC Programming Example......................................................................................27
1-4-1 Simple Example of an SFC Program ..............................................................................27
1-4-2 Procedures for Using CX-Programmer...........................................................................30
1-5 Precautions When Creating SFC Programs...............................................................33
1-5-1 Holding or Resetting an Action’s Outputs......................................................................33
1-5-2 Action Program Precautions ...........................................................................................34
1-5-3 Precautions for Transition Programs...............................................................................36
1-5-4 Ladder Language Instructions That Cannot Be Used in Action Programs and Transition
Programs .........................................................................................................................37
1-5-5 Task Allocation...............................................................................................................37
1-5-6 Memory Allocation.........................................................................................................38
1-5-7 Subchart Online Editing Function Restrictions...............................................................39

SFC Overview Section 1-1
2
1-1 SFC Overview
1-1-1 SFC Overview
The SFC (Sequential Function Chart) language is a graphical programming language
developed to facilitate the description of step progression programs, which mainly
control sequential processes.
SFC, with its graphical representation of step flow and with description of the
conditions for step progression and the actions in each step, allows users to program
the control of sequential processes.
Process Flow
Processing Contents
Processing Contents
Step1
Step2
Step3 Processing Contents
Step Transition Condition
Step Transition Condition
Step Transition Condition
SFC offers the following advantages.
Since step flow and program control correspond, even third-party programmers can
easily understand the program, as a whole. This reduces the program debugging and
maintenance workload.
A
C
B Step A
Step C
Equipment Control/
External Device Control SFC Program
Correspond-
ence
Step B
Programs can be created separately for each step, without the need to consider
complicated requirement exchanges between steps. In other words, each step can be
programmed separately, by a different developer, making program development
simpler and more efficient.

SFC Overview Section 1-1
3
Processing Contents
Processing Contents
Step1
Step2
Step 3 Processing Contents
Developed by
“A”
Developed by
“B”
Developed by
“C”
Steps can be
developed separately.
Programs are independently completed for each step, and are therefore simple to
reuse.
Processing is performed on a per step basis, giving process time, only to active steps,
and not to inactive steps, allowing the CPU unit cycle time to be shortened.
1-1-2 CX-Programmer Features
The CX-Programmer Support Software is equipped with an SFC editor, and can be
used to create, monitor, and debug SFC programs for CS/CJ-series and CJ2-series
PLCs. The CX-Programmer supports SFC language in addition to conventional ladder
and structured text (ST) programming languages.
With desirable features, such as the user interface, carried over from the earlier series,
and with the added SFC programming function, the CX-Programmer provides a
programming environment that can take full advantage of the SFC language’s features.
Combining SFC, Ladder, and ST for User Programs
Each program allocated to a task can be coded as an arbitrary combination of SFC,
ladder, and ST. Hence, the language best suited to each process can be utilized (e.g.
SFC for step progression, ladder for device control, and ST for mathematical
processes).
The common functions of CX-Programmer are still available to use, regardless of the
language used.
ST
Mathematical
Processes
Programming
Language Best
Suited to the
Process is
Selectable
SFC
Step Progression
Control
User Program
Task
Task
Task
Task
a = a + 1
Ladder
Device Control

SFC Overview Section 1-1
4
Ladder and ST as Part of SFC Programs
The step actions and transition conditions within an SFC program can be coded in
either ladder or ST.
The step actions and transition conditions coded in ladder or ST are registered in an
SFC program as action programs and transition programs.
A
ction Programs (Ladder)
A
ction Programs (ST)
Transition Program (Ladder)
Transition Program (ST)
Simultaneous Display/Editing of SFC Charts and Action/Transition Programs
The SFC chart editor can display the SFC view and program view in a horizontally or
vertically split window, allowing an SFC chart and action block (or transition program)
to be viewed and edited at the same time.
In addition, action blocks can be hidden in the SFC view, but action programs and
transition programs can be viewed and edited in the program view, even when the
action blocks are hidden in the SFC chart. Processing contents and transition
conditions can be viewed and edited while envisioning the entire program picture,
allowing the features of SFC to be fully realized.
Action Blocks Shown
Program View
SFC View