Troubleshooting In The Redundant System; When Output Data Turn Off Or Momentarily Off In System Switching - Mitsubishi Electric Melsec Q Series User Manual

9
TROUBLESHOOTING

9.4 Troubleshooting in the Redundant System

This section explains the troubleshooting procedures for the case where the QJ71PB92V
is mounted in a redundant system.

9.4.1 When output data turn OFF or momentarily OFF in system switching

The following shows the troubleshooting steps for the case where output data turn OFF or
momentarily OFF in system switching.
Output data turns OFF or momentarily OFF in system switching.
Is the standby master FDL address
of the QJ71PB92V set correctly?
Yes
Does the set watchdog timer value
for each DP-Slave satisfy the calculation
formula shown in Section 4.8 (5)?
Yes
Were the same parameters written
to both QJ71PB92Vs in System A and B?
(Parameters set in GX Configurator-DP)
Yes
Is the PROFIBUS cable
wiring correct?
Yes
Are the devices that store the start
command and output data in the sequence
program within the tracking range?
Yes
Were the tracked output data stored
in the Output data area (Un\G14336 to Un\G18431)
within 1 scan after system switching?
Yes
Completed
Figure 9.6 When Output Data Turn OFF or Momentarily OFF in System Switching
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- 8 9.4 Troubleshooting in the Redundant System
9.4.1 When output data turn OFF or momentarily OFF in system switching
Check the intelligent function module switch setting.
No
Section 6.7
(£
No Set a proper watchdog timer value that satisfy the calculation
formula shown in Section 4.8 (5) for each DP-Slave.
Using GX Configurator-DP, check the parameters.
No
(¢GX Configurator-DP Version7 Operating Manual)
If any different parameter is found, write the same parameters to
the QJ71PB92Vs in system A and B again.
No
Check the PROFIBUS cable connections. (£
Check if the devices that store the start command and output
No
data in the sequence program are set as tracking devices.
Section 7.9
(£
Store the tracked output data in the Output data area
No (Un\G14336 to Un\G18431) in the timing of "ON for 1 scan only
after switching the system from standby to control" (SM1518).
Section 7.9
(£
)
Section 5.5
)
)
)