Redundant Processor - FOR-A MFR Series Operation Manual

3-2. Redundant Processor

A secondary CPU can be installed on an MFR Series main units (excluding MFR-1000/1616/
1616A) to configure CPU redundancy. An active CPU controls the system and the other CPU
monitors the system. The CPU usage state (which CPU is active) can be checked by monitoring
through Web-Based Control.
* Note that CPU change-over takes about 30 seconds from when an error condition occurs.

MFR-5000/8000
MFR-5000/8000 main units have two LAN ports for PC connection. Make sure to open Web-Based
Control via the LAN port of an active CPU. Otherwise, the message as shown in the figure below
appears and the settings are not applied.
Settings in the Network Settings and SNMP Settings page, however, are possible on an inactive
CPU.
The CPU usage state (which CPU is active) can be checked under [mfrMuCpuStatus] >
[mfrMuActiveCpu] through SNMP.

MFR-1616R / 3216 / 3216RPS / 3232 / 3232RPS / 3000
Normally the primary CPU is active and the secondary CPU (MFR-SRCPU/3000) is automatically
activated to take over only when a failure occurs on the primary CPU. In the same way, Web-Based
Control normally connects to the primary CPU. When a failure occurs on the primary CPU, it
automatically connects to the secondary CPU.
An error message appears when failures occur on the secondary CPU.
If the secondary CPU is activated:
MFR-1616R/3216/3232:
When the primary CPU is active.
A message appears when connecting to
an inactive CPU.
When the secondary CPU is active.
SRCPU is displayed under Unit
Name.
SRCPU is displayed.
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