Mitsubishi Electric MELSEC iQ-RJ71EN71 User Manual page 93

System switching monitoring target station
When a system switching monitoring target station is set, if the RJ71GF11-T2 mounted on the control system detects a
communication error with the monitored slave station, a system switching request can be issued to the control system CPU
module.
This allows communication with the system switching target station to be prioritized and continued.
A system switching monitoring target station is set when a network configuration is set as a line topology or a mixture of star
and line topologies, where multiple slave stations are connected, and when it is desired to give priority to continuation of
communication for some slave station.
A system switching monitoring target station is set in the master station module parameters. It can only be set
when the module model name of the master station is "RJ71GF11-T2 (MR)".
■When a system switching monitoring target station is set
A system switching request is issued because communications between the master station and the system switching
monitoring target station (1) cannot be maintained due to disconnection.
Communications with the system switching monitoring target station are continued by the submaster station operating as the
new control system.
Control system
When the own station data link status shows an error ('Data link error status of own station' (SB0049) is on), a
system switching request is issued against a data link error regardless of the status of the system switching
monitoring target station.
■When a system switching monitoring target station is not set
A system switching request is only issued when the own station data link status shows an error ('Data link error status of own
station' (SB0049) is on). When one of the slave stations can be communicated with, a system switching request is not issued
because the own station data link status does not show an error.
Control system
■Setting method
Set the system switching monitoring target station in "Network Configuration Settings" under "Basic Settings." ( Page 129
Network Configuration Settings)
The setting status of the system switching monitoring target station can be checked in 'Setting status of system switching
monitoring target station' (Un\G24496 to Un\G24503).
(1)
1.7 Redundant System Function
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1 FUNCTIONS
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