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MELSEC-Q
8 TROUBLESHOOTING
8.4.2 Canceling errors of all remote I/O stations
This section explains how to manipulate the remote master station to cancel errors of
all remote I/O stations.
POINT
(1) For canceling errors of all remote I/O stations, use a master module and
remote I/O modules whose serial No. (first five digits) is “08112” or later.
For a module whose serial No. (first five digits) is “08111” or earlier, follow the
steps described in Section 8.4.1.
(2) Errors of all remote I/O stations can be canceled only while the remote master
station performs baton (or token) passing (SB0047 is OFF).
(3) In multiplexed remote I/O networks (including those supporting redundant
systems), this cancel operation is available only from the station acting as a
master.
(1) Procedures for error cancellation
Use the sequence program or GX Developer and perform the following steps 1)
to 8).
For sample programs, refer to section (3).
[Remote I/O station side]
1) Remove the cause of the remote I/O station error.
[Remote master station side]
2) Turn ON link special relay SB000F of the master module.
Doing so will cancel errors of all remote I/O stations.
3) Check that the master module is in the following status.
<Remote I/O network>
Check that link special relay SB0088 is OFF.
<Multiplexed remote I/O network (including the one that supports
redundant systems)>
With link special registers SW0088 to SW008B, check that the bit
corresponding to the remote I/O station is 0.
4) Turn OFF the link special relay SB000F of the master module.
5) The error of the remote I/O module is canceled.
For the blown fuse error or the I/O module verification error, perform
steps 6) to 8).
6) Store the error code to be canceled into special register SD50 of the
CPU module.
7) Turn OFF and then ON special relay SM50 of the CPU module.
8) The error in the CPU module is canceled.