Mitsubishi Q00JCPU User Manual page 558

9
DEVICE EXPLANATION
Remark
9
9.13 Convenient Usage of Devices
- 107
9.13.1 Global devices and local devices
2) Operation at "SM777 : ON"
File name: ABC
X0
DECP
Occurrence
X2
of interrupt
Local devices used by
the file name: ABC
3) Precautions
• If SM777 is ON, the local device data is read before the interrupt/fixed
scan execution type program is executed and the local device data is
saved after the execution of the IRET instruction.
Accordingly, scan time increases when an interrupt/fixed scan execution
type program is executed once with the setting of "SM777: ON".
• ON/OFF setting of SM777 is enabled in CPU module units.
Setting in file unit is not enabled.
• If the ON/OFF setting of SM777 is changed while a sequence program is
executed, the control is made according to the information after change.
For details on SM777, see Appendix 1.
(f) Clearing the Local Device Data
Clear the local device data in either of the following methods.
• The PLC is powered on or the CPU module is reset.
• The CPU module enters into the RUN status from the STOP status.
The local device data cannot be cleared by operating from the GX Developer.
D1
Execution of the
INCP D0
interrupt program
END
Read/write of the
local devices
Diagram 9.102 When SM777 is ON
File name: DEF
(Stand-by type program)
I0
Interrupt program
IRET
Local devices used by
the file name: DEF