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(c) Precautions
• When SM777 is on, local device data are read out before execution of an interrupt/fixed scan execution
type program, and the data are saved after execution of the IRET instruction.
Because of this, the scan time is increased if one interrupt/fixed scan execution type program is executed
with SM777 set to on.
• The on/off status of SM777 is set for each CPU module.
It cannot be set for each file.
• If the on/off status of SM777 is changed during sequence program execution, control is implemented
according to the information after the change.
Remark
For details of SM777, refer to CHAPTER 12.
(7) Clearing local device data
Local device data is cleared by either of the following:
• When the CPU module is powered off and then on or is reset
• When the CPU module status is changed from STOP to RUN
Local device data cannot be cleared from GX Developer.
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