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4 TROUBLESHOOTING
4.4 Troubleshooting by Symptom
When redundant system function is used
■
Error occurs in a Process CPU (redundant mode) or a SIL2 Process CPU (redundant mode).
If an error occurs in a Process CPU (redundant mode) or a SIL2 Process CPU (redundant mode) in the redundant system,
check the following items.
■
System switching cannot be performed
When system switching cannot be performed by a system switching cause of the RJ71GF11-T2, check the following.
■
Cyclic data is turned off when system switching occurs.
If cyclic data is turned off, or momentarily turned off when system switching occurs, check the following items.
■
Data link is not performed with the pairing-set slave station.
If data link is not performed with the pairing-set slave station, check the following items.
Check item
Action
When making a slave station redundant,
is the module model name correctly set in
"Network Configuration Settings" under
"Basic Settings"?
Check the module model name set in "Network Configuration Settings" under "Basic Settings." (
Network Configuration Settings)
Does the RJ71GF11-T2 used support the
redundant system function?
Use the RJ71GF11-T2 supporting the redundant system function. (
Check item
Action
Is the power supply module, Process
CPU (redundant mode), or redundant
function module of the standby system
operating normally?
Perform troubleshooting on the power supply module, Process CPU (redundant mode), or redundant function
module of the standby system. (
MELSEC iQ-R CPU Module User's Manual (Application))
Is the standby system RJ71GF11-T2
connected to the network?
Check the wiring condition and put the network of the standby system in normal condition.
Has a system switching request been
issued to the Process CPU (redundant
mode)?
• Check the event history on the RJ71GF11-T2 mounted on the control system Process CPU (redundant mode) to
see if a system switching request has been issued. (
Page 219 Checking the Module Status)
• Check an error on the RJ71GF11-T2 mounted on the control system Process CPU (redundant mode) and
correct the error. (
Page 219 Checking the Module Status)
For system switching to be triggered by a
communication error in a specific slave
station, is that station set as a system
monitoring target station?
Check the system monitoring target station setting in "Network Configuration Settings" under "Basic Settings."
(
Page 129 Network Configuration Settings)
Check item
Action
Is the own station send range within the
tracking range?
Check whether the cyclic data send range is included in the tracking target. (
MELSEC iQ-R CPU Module
User's Manual (Application))
Is the interlock used in the program
correct?
Correct the program to interlock with the following module labels.
• 'Data link error status of own station' (SB0049)
• 'Master/submaster function operation status of own station' (SB004E)
• 'Redundant system data link error status of each station' (SB01B0)
• 'Redundant system data link error status of master station' (SB01B1)
• 'Redundant system data link error status of station No.0' (SB01BF)
• 'Redundant system data link status of each station' (SW01B0 to SW01B7)
Check item
Action
Does the pairing-set slave station support
the redundant system function?
Check 'Redundant function information of each station' (Un\G24504 to Un\G24511) and replace the slave station
not supporting the redundant system function.
Is the pairing-set slave station set to the
redundant system configuration?
Check 'Pairing setting status of each station' (SW00D8 to SW00DF) and set the pairing-set slave station to the
redundant system configuration.
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