Systems Cannot Be Switched In A Redundant System - Mitsubishi Electric QJ71E71-100 User Manual

16.5.16

Systems cannot be switched in a redundant system.

The following table lists how to troubleshoot the problem when systems cannot be switched in a redundant system.
Check item
Has the E71 issued a system switching request to the
control system CPU module?
Has "Issue system switch in communication error" been
selected in "Redundant settings"?
Has the correct number been selected in "System switching
settings when communication error occurs" in "Redundant
settings"?
Do the settings of the programming tool match those of the
buffer memory?
Has disconnection been detected?
Has "Issue system switch in Cable disconnection timeout"
been selected in "Redundant settings"?
Is the disconnection detection monitoring time setting
correct?
Is the setting value in "TCP ULP Timer" in the initial setting
correct?
Has "Confirm" been selected in "Existence Confirmation" in
the open setting?
Is the setting value in "Dest. Confirmation Start Interval" in
the initial setting correct?
Is the setting value in "Dest. Confirmation Interval" in the
initial setting correct?
Is "Broadcast Communications" displayed in "Transmission
target device IP address" in the open setting?
Is the connection open?
Has the group setting been configured?
Is the power supply module of the standby system on?
Is the RESET/L.CLR switch of the standby system CPU
module set to the central position (reset clear)?
Is the tracking cable connected properly?
Is the standby system CPU module operating normally?
Is the connected CPU module the control system?
Is there any cause, such as a standby system CPU module
stop error, which disables system switching even when the
E71 issues a system switching request?
Is the CPU module in the backup mode?
If the action above does not solve the problem, perform the following tests on the E71 to check for hardware error.
• Hardware test (
• Self-loopback test (
298
• Use SD1590 of the control system CPU module to check if the E71 has
issued a system switching request.
• Check Error log area (address: E3
control system CPU module. Then correct the error.
Select "Issue system switch in communication error" in the "Redundant
settings".
Select the correct number in "System switching settings when
communication error occurs" in the "Redundant settings".
After writing the parameters to the CPU module, power off and on the CPU
module or reset the system.
Check if the communication target is faulty.
Select "Issue system switch in Cable disconnection timeout" in "Redundant
settings".
Check and correct the disconnection detection monitoring time setting.
Check and correct the setting value in "TCP ULP Timer".
Select "Confirm".
Check and correct the setting value in "Dest. Confirmation Start Interval".
Check and correct the setting value in "Dest. Confirmation Interval".
Set the IP address of the communication target station in "Transmission
target device IP address".
Open the connection.
Check the connected CPU module.
Power on the power supply module of the standby system.
Set the RESET/L.CLR switch to the central position (reset clear).
Connect the tracking cable properly.
Check and correct the error of the standby system CPU module.
Set the connected CPU module as the control system.
Remove the cause of the system switching failure.
QnPRHCPU User's Manual (Redundant System)
Change it from the separate mode to the backup mode.
Page 374, Appendix 6.2)
Page 373, Appendix 6.1)
Action
to 174 ) of the E71 connected to the
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