Remote Latch Clear - Mitsubishi Electric MELSEC-Q Series User Manual

7 FUNCTION

7.6.4 Remote Latch Clear

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(1) What is Remote Latch Clear?
(a) The remote latch clear resets the device data latched to the Basic model
QCPU using the GX Developer function or other function, when it is at the
STOP state.
(2) Remote Latch Clear Method
The remote latch clear can only be performed from GX Developer function or
serial communication module.
To perform the remote latch clear, follow the following steps:
(a) Use the RUN/STOP/RESET switch or the remote STOP to place the Basic
model QCPU to the STOP status.
(b) Use the Latch Clear to bring the Basic model QCPU to the Latch Clear
status.
1) The GX Developer function operations are performed with 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 Basic model QCPU to the RUN status after the remote latch
clear, perform a remote RUN operation.
(3) Precautions
(a) Either remote latch clear cannot be performed when the Basic model QCPU
is at RUN status.
(b) There the latch clear (remote latch clear operation) valid range and invalid
range as the device latch ranges set in the device setting in the parameter
mode.
In the remote latch clear operation, only the device range set as the "latch
clear valid" range is reset.
Refer to Section 4.6 for the way to reset the device set to latch clear invalid.
(c) Devices that are not latched are cleared when the remote latch clear is
executed.
The data in the failure history storage memory of the Basic model QCPU
will also be cleared by a remote latch clear operation.
MELSEC-Q
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