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Mitsubishi Electric Melsec Q Series User Manual page 144

Profibus-dp master module
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4
FUNCTIONS
(5) Precautions for using the QJ71PB92V in the redundant system
4
- 35
4.8 Redundant system support function
This section explains precautions for the case where the QJ71PB92Vs are mounted
to a redundant PROFIBUS-DP system.
(a) Precautions on the QJ71PB92V side
1) Function version of the QJ71PB92V
Use the QJ71PB92V of function version D or later. (
2) When starting up the redundant system
Check the Local station error information area (Un\G23071) to see if the
QJ71PB92V has an error or not. (
If an error exists, remove the error cause.
When an error exists, system switching is not executed.
3) Continuation of each function of the QJ71PB92V
For precautions for continuing each function of the QJ71PB92V, refer to
Section 7.9.7.
4) When system switching occurred
Do not perform the following before the system switching is completed.
• Turning off the power of the new control system
• Resetting the redundant CPU on the new control system
If either of these is performed before completion of the system switching, DP-
Slave outputs may turn off momentarily.
Confirm that the system switching is completed before doing the above
operations.
Completion of the system switching can be confirmed by either of the following
methods.
Table4.12 Confirmation of system switching completion
Item
Input signals
LEDs
5) Operations available for the QJ71PB92V in the standby system
The following operations are available for the QJ71PB92V in the standby
system when the redundant CPU is in Separate or Debug mode.
• Writing parameters by GX Configurator-DP
• Changing the operation mode (
• Restarting the QJ71PB92V using the Restart request signal (Y0D)
(
Section 3.3.2(8))
* 1 When the redundant CPU is in Backup mode, GX Configurator-DP automatically changes it to the
Separate mode to write the parameters.
Section 2.4)
Section 3.4.2)
QJ71PB92V in new control system
Communication READY signal (X1B) and Module
READY signal (X1D) are ON.
• RUN and READY LEDs are ON.
• RSP ERR. and FAULT LEDs are OFF.
*1
Section 6.2)

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