System Switching Request To The Control System Cpu Module - Mitsubishi Electric MELSEC iQ-RJ71EN71 User Manual

System switching request to the control system CPU module

When the RJ71GF11-T2 mounted on the control system detects a network error, it issues a system switching request to the
control system CPU module.
However, depending on the operating status of the standby system, system switching is not executed.
For details on the operating status of the standby system and whether system switching is executable, refer to the following.
 MELSEC iQ-R CPU Module User's Manual (Application)
For the remote head module system switching, refer to the following.
 MELSEC iQ-R CC-Link IE Field Network Remote Head Module User's Manual (Application)
System switching cause
This section describes causes that make the RJ71GF11-T2 issue a system switching request.
For details on causes other than a system switching request from the RJ71GF11-T2, refer to the following.
 MELSEC iQ-R CPU Module User's Manual (Application)
■Moderate/major error and hardware failure
When detecting an error where the RJ71GF11-T2 cannot continue the processing, the RJ71GF11-T2 notifies the control
system CPU module about the error and issues a system switching request.
■Data link error
If the data link error status continues for the system switching monitoring time set in "Supplementary Cyclic Settings" under
"Application Settings" or longer, a system switching request is issued to the control system CPU module.
In the following cases, a switching request will not be issued to the control system CPU module.
• When cyclic transmission is stopped by link start/stop in the CC-Link IE Field Network diagnostics (This also
applies to cases in which cyclic transmission is stopped by a link special relay (SB) or link special register
(SW).)
• When the network map is updated using the [Update] button in the CC-Link IE Field Network diagnostics
(Page 230 Diagnostics window)
If a data link error occurs due to disconnection or breakage of the Ethernet cable or other causes when the
master/local module is powered on or is reset, issuance of system switching request differs depending on the
redundant system configuration.
• Redundant master station, redundant line: A system switching request is issued to the control system CPU
module about 30 seconds after the control system and standby system of a redundant system are
determined.
• Redundant slave station: A switching request is not issued to the control system CPU module.
■Communication error with the system switching monitoring target station
If the communication error with the system switching monitoring target station continues for the system switching monitoring
time set in "Supplementary Cyclic Settings" under "Application Settings" or longer, a system switching request is issued to the
control system CPU module. ( Page 91 System switching monitoring target station)
When the master/local module is powered on or is reset, even if the communication error with the system
switching monitoring target station continues for the system switching monitoring time or longer a system
switching request is not issued to the control system CPU module until communications with the system
switching monitoring target station go back to normal.
■Slave station error (redundant line only)
In a redundant line configuration, if an error in the slave station continues for the system switching monitoring time set in
"Supplementary Cyclic Settings" under "Application Settings" or longer, a system switching request is issued to the control
system CPU module.
When a moderate or major error occurs or hardware failure occurs in the slave station, a system switching request is issued to
the control system CPU module regardless of the system switching monitoring time.
1 FUNCTIONS
1.7 Redundant System Function
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