Operation When A Program Is Modified - Mitsubishi Electric MELSEC iQ-R Series Programming Manual

Operation when a program is modified

To change an SFC program, use the following functions.
• Write to the programmable controller
• Online change
• Online change (inactive SFC block)
The following table lists changes that can be made to SFC programs by executing each function above.
Change type
SFC program addition
SFC block addition/deletion
SFC block SFC diagram
change change
Change in SFC
diagram
Block information change
*1 The online change (inactive SFC block) can be used with the programmable controller CPU. ( Page 148 Online change (inactive
SFC block)) Before using this function, check the versions of the CPU module and the engineering tool used. ( MELSEC iQ-R CPU
Module User's Manual (Application))
When data is written to the programmable controller
The SFC program operates as follows.
SM322 (SFC program start mode)
Off: Initial start
On: Resumption
Values of devices and labels used in the SFC program will be as follows depending on the setting of SM326 (SFC device/label
clear mode).
SM326 (SFC device/label clear mode)
Off
On
*1 The setting of SM326 is valid only when an SFC program exists after data is written to the programmable controller. It is also valid when
a program file or parameter file is written to the programmable controller. It will be invalid when only the common device comment file,
device memory file, or device initial value file is written.
*2 Even when the device is not latched, data is not cleared.
8 SFC PROGRAM
146
8.7 SFC Program Execution
*1
Step/transition addition/
deletion
Transition destination change
Step attribute change
Operation output program
change
Transition program change
Program modification status
Modified
Initial start
Initial start
*1
Description
Values of devices and labels, excluding the following, are cleared, and the SFC program is
executed.
• Step relay (S)
• File register (R/ZR)
• Latched labels
Values of devices and labels, excluding the step relay (S), are held, and the SFC program is
executed.
Write to the programmable
controller
STOP/ PAUSE RUN
 
 
 
 
 
 
 
 
*2
Online change Online change
(inactive SFC
*1
block)
 
 
 
 
 
 
 
 
Not modified
Initial start
Resumption