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MELSEC-Q
8 TROUBLESHOOTING
POINT
(1) The target of the network diagnostics is the host's network designated as the
connection destination.
(2) If the connection target is specified as another station or the redundant CPU is
specified as a control system, standby system, system A, or system B, the
network monitor can check only the information of the host and other stations.
(3) The network diagnostics cannot be displayed correctly while the network
module is executing the offline test.
(4) When the link dedicated instruction is used to access the other station
programmable controller during network diagnosis, the execution of the link
dedicated instruction may be delayed.
After taking the following measures, perform network diagnosis processing and
execute the link dedicated instruction.
• Execute the COM instruction.
• Secure the communication processing security time for 2 to 3ms.
For the High Performance model QCPU, Process CPU, and Redundant CPU,
set it by the special register SD315.
For the Universal model QCPU, set it by the service processing setting of the
PLC parameter (PLC system) of GX Developer.
REMARKS
SB and SW found in the explanations of each item indicate the link
special relay (SB) or the link special register (SW) used for monitoring.