5
REDUNDANT SYSTEM FUNCTIONS
5.3 The System Switching Function
5.3.1 System Switching Method
5 - 34
1
OVERVIEW
2
SYSTEM
CONFIGURATION
3
TRACKING CABLE
4
PROCEDURE FOR
STARTING UP A
REDUNDANT SYSTEM
5
REDUNDANT SYSTEM
FUNCTIONS
6
REDUNDANT SYSTEM
NETWORKS
7
PROGRAMMING
CAUTIONS
8
TROUBLESHOOTING
If system switching is performed in the backup mode, the following error codes will be
stored into the error history of the new control system and new standby system CPU
modules.
In this case, the ERR. LED will remain off. (The ERR. LED does not turn on or flash.)
• New control system: "CONTROL EXE. (error code: 6200)"
• New standby system: "STANDBY (error code: 6210)"
It is possible to confirm if the system switching has been executed or not in the PLC
diagnostics (Error log) of GX Developer.
*2
* 2: If the "WTD error" occurs in the new standby system, PLC diagnostics cannot be done via the
tracking cable.
Connect an RS-232 cable or USB cable to the system to be diagnosed (new control system/new
standby system) and execute the PLC diagnostics.
The reason for system switching can be confirmed on the Error details window.
Diagram 5.20 New Control System PLC Health Check
Display
Diagram 5.21 New Standby System PLC Health Check
Display
Diagram 5.22 Error details window
Reason(s) for system switching
0 No system switching condition (default)
1 Power OFF, reset, hardware failure,
watchdog timer error
2 Stop error (except watchdog timer error)
3 System switching request by network module
16 Control system switching instruction
17 Control system switching request from
GX Developer
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