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MELSEC-Q
10 DEVICES
2) Cautions
• 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". (See Section 10.13.1)
• 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.
(g) Clearing the Local Device Data
The local device data is cleared in the following cases where:
1) The PLC is powered on or the CPU module is reset.
2) 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.
To clear the local device data, follow the above-listed steps 1) and 2).
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