Operation At Program Change Made By Write To Plc; Program Change By Online Change - Mitsubishi Electric MELSEC-Q Series Programming Manual

Operation at program change made by write to PLC

This section describes the operation at program change made by write to PLC.
When program was written with CPU module in PAUSE/STOP status
■Program start after write to PLC
An initial start is performed independently of the SFC start mode setting (initial start/resume start). Depending on the SFC
program change, however, an initial start is not made but a resume start may be made at the resume start setting. Refer to
Page 120 SFC program start mode for details of the SFC program start mode.
■Device status at program start
At a program start after write to PLC, the CPU module devices operate as described in the following table depending on the
setting of the SFC device clear mode setting flag (SM326).
SM326
OFF
ON
The setting of SM326 is valid only when an SFC program exists after write to PLC. When sequence program
and/or parameter write is performed, the setting of SM326 is also valid. (The setting of SM326 is ignored when
only the data other than the SFC program, sequence program and parameters are written.)
When program was written with CPU module in RUN status
■Program start after write to PLC
An initial start is performed independently of the SFC start mode setting (initial start/resume start). Refer to Page 120 SFC
program start mode for details of the SFC program start mode.
■Device status at program start
The SFC program is executed with all devices held.

Program change by online change

This section describes the program change by online change.
Program start after write to PLC
When program change is made by online change, a resume start is performed independently of the SFC start mode setting.
Device status at program start
The SFC program is executed with all devices held.
6 SFC PROGRAM EXECUTION
168
6.6 Operation at Program Change
Operation
Step relay
Turned ON/OFF by the system.
Other than step relay
SFC program is executed after all devices have been cleared.
SFC program is executed with all devices held.