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Mitsubishi Electric Melsec Q Series User Manual page 142

Profibus-dp master module
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4
FUNCTIONS
4
- 33
4.8 Redundant system support function
POINT
(1) With a communication error identified in a system switching target DP-Slave
after system switching, no system switching is performed even if a
communication error occurs in another DP-Slave.
To perform system switching again, restore all of the switching target DP-
*1
Slaves
to normal condition.
The DP-Slave status can be confirmed in the Slave status area (Normal
communication detection) (Un\G23040 to Un\G23047). (
* 1 It is any of all the DP-Slaves that are specified in the System switching DP-Slave specification area
(Un\G23649 to Un\G23656).
Control system
New standby system
Power
Redundant
supply
CPU
module
Bus terminator
DP-Slave
(FDL address 2)
Communication
failure
New standby system
Power
Redundant
supply
CPU
module
Bus terminator
DP-Slave
(FDL address 2)
Communication
failure
(2) Do not change the initial value of b8 in the Diagnostic information invalid
setting area (Un\G2080). (
Changing the initial value disables the system switching by a DP-Slave.
(3) System switching by DP-Slave is enabled when the value in the Current
diagnostic information non-notification time area (Un\G2085) becomes 0 after
the Data exchange start request signal (Y00) turns ON.
Standby system
New control system
QJ71
Executes system
switching
PB92V
Tracking cable
DP-Slave
(FDL address 3)
Before recovery of the
switching target DP-Slave, an
error occurred at another DP-
Slave.
No system
QJ71
switching
PB92V
Tracking cable
DP-Slave
(FDL address 3)
Section 3.4.6)
Section 3.4.5)
Power
QJ71
Redundant
supply
CPU
PB92V
module
DP-Slave
(FDL address 4)
New control system
Power
Redundant
QJ71
supply
CPU
PB92V
module
DP-Slave
(FDL address 4)
Communication
failure
*1

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