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MELSEC-Q
7 FUNCTION
7.6.4 Remote latch clear
(1) What is Remote Latch Clear?
(a) The remote latch clear resets the device data latched to the High
Performance model QCPU using the GX Developer etc., when the High
Performance model QCPU is in STOP status.
(b) Remote latch clear is useful when the High Performance model QCPU is in
the following areas. In these cases, the operations are performed in
combination with the remote RUN/STOP.
• When the High Performance model QCPU is at a position out of reach
• When externally performing latch clear of the High Performance model
QCPU inside a control panel.
(2) Remote Latch Clear Method
The remote latch clear can only be performed from GX Developer or by using
serial communication module.
To perform the remote latch clear, follow the following steps:
(a) Use the remote STOP to bring the High Performance model QCPU to
STOP status.
(b) Use the Latch Clear to bring the High Performance model QCPU to the
Latch Clear status.
1) The GX Developer operations are performed by on-line remote
operation.
2) The serial communication module and Ethernet interface module are
controlled by commands complying with the MC protocol.
For details of the MC protocol, refer to the following manual.
• Q Corresponding MELSEC Communication Protocol Reference Manual
(c) To return the High Performance model QCPU to RUN status after the
remote latch clear, perform a remote RUN operation.
(3) Precautions
(a) Either remote latch clear or latch clear by RESET/L.CLR switch cannot be
performed when the High Performance model QCPU is in RUN status.
(b) The latch range for the device set at the "Device" tab screen in the “(PLC)
Parameter" dialog box includes a range that makes latch clear
(RESET/L.CLR switch) valid or invalid.
Remote latch clear operation is reset in the range of latch clear valid
setting.
(c) Devices that are not latched are cleared when the remote latch clear is
performed.
The data in the failure history storage memory of the High Performance
model QCPU will also be cleared by a remote latch clear operation.
Содержание QCPU (Q Mode)
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