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MELSEC-Q
3 SPECIFICATIONS
(2) Link refresh, link scan, I/O refresh and automatic refresh
(a) Link refresh of the remote master station
Link refresh of the remote master station is performed in the END
processing of the CPU module.
END0
Remote master station
sequence scan
Remote master station
master module
END0 END0 END0
Link refresh Link refresh Link refresh
POINT
If latch device (listed in "Device set in PLC side" in the following table) data is
cleared to "0" using a sequence program when the CPU module is powered off and
on or is exited from the RESET status, the latch data may be output depending on
the timing of link scan and link refresh.
To prevent this, perform the operation described in "How to disable the link refresh"
in the following table.
Device set in PLC side How to disable the link refresh
Latch relay (L)
Clear the value of the device to 0 by using
device initial value
(*1)
.
File register (R, ZR)
Extended data register (D)
(Universal model QCPU only)
Clear all latch range settings. Extended link register (W)
(Universal model QCPU only)
Devices within the latch range
*1: For details on the setting of device initial value, refer to the user's manual
(Function Explanation, Program Fundamentals) for the CPU module used.