Mitsubishi Electric Melsec Q Series User Manual page 138

4
FUNCTIONS
4
- 29 4.8 Redundant system support function
(a) Operation of the QJ71PB92V in system switching
1) The control system CPU or QJ71PB92V performs system switching when it
detects a system switching error.
For errors that cause system switching (system switching methods), refer to
(2) in this section.
2) When system switching occurs, the FDL address of the QJ71PB92V is
changed as shown below.
Table4.7 FDL Address of the QJ71PB92V in System Switching
Item
QJ71PB92V switched from control
system to new standby system
QJ71PB92V switched from
standby system to new control
system
These changes can be confirmed in the Local FDL address display area
(Un\G2257).
3) System switching is performed, and the QJ71PB92V in the new control system
continues communication.
(b) Redundant system parameters
In a redundant system including redundant CPUs, write the same parameters to
system A (control system) and B (standby system).
System A
(Control system)
Tracking cable
Parameters set in GX Configurator-DP and GX Works2
Figure 4.28 Redundant System Parameters
FDL address
Control master FDL address
Standby master FDL address
System B
(Standby system)
In the redundant system including redundant
CPUs, the same parameters are written to
systems A (control) and B (standby).
Standby master FDL address
Control master FDL address