Automatic Recovery To Duplex Operation By Self-Diagnosis - Omron CS1D DUPLEX SYSTEM - 10-2009 Operation Manual

Duplex CPU Units
3-1-4

Automatic Recovery to Duplex Operation by Self-diagnosis

Note
120
(1)
Duplex Mode
Standby Active
(Duplex error)
(2)
Simplex Mode
Remains in Remains
standby in active
status status
(cannot be
switched)
After the mode has been switched from Duplex Mode to Simplex Mode due to
an operation switching error or a duplex error, an automatic attempt is made
to return to Duplex Mode if this function has been enabled in the PLC Setup.
This function is mainly useful for momentary or incidental disruptions (to
memory, bus, etc.) due to factors such as noise, rather than for hardware
breakdowns.
When this automatic recovery function is executed, it does not return standby
status to active.
(1)
Duplex Mode
Standby Active
(Operation switching error)
Mode switched.
(2) Simplex Mode
Active CPU Unit stopped.
Self-diagnosis normal
(3)
Duplex Mode
Active Standby
1. In order for automatic recovery to be enabled, the power to the other CPU
Unit must not be OFF and the Mode Setting Switch must be set to DPL. If
the mode cannot be automatically returned to Duplex Mode, the following
bits in the Auxiliary Area (CPU Unit Duplex Unit Recovery Flags) will turn
ON.
Right CPU Unit: A32814 turns ON.
Left CPU Unit: A32815 turns ON.
2. When Duplex Mode operation has been recovered, the error log automat-
ically will be transferred from the new active CPU Unit to the new standby
CPU Unit (i.e., the one that was the active CPU Unit before). To check the
Automatic recovery
Section 3-1