Omron SYSMAC CS1D-PD Series Operation Manual page 164

Duplex CPU Units
124
• Fatal Inner Board error: Fatal Inner Board Error Flag (A40112) turns ON.
(This is a fatal error for Single CPU Systems or the CS1-H.) (Process-
control CPU Units only)
• FALS error: FALS Error Flag (A40106) turns ON. (Previously this was a
fatal error.)
• Power OFF (when the CPU Setting Switch on the active CPU Unit is
switched from USE to NO USE)
(1)
Duplex Mode
Standby
(2) Simplex Mode
Active
The CPU Unit where the error occurred can be replaced while the system
continues operating using the CPU Unit online replacement function.
Note 1. To determine the cause of a switch to the standby CPU Unit, refer to A023
in the Auxiliary Area or to Mode Switch Reference, below.
2. In Simplex Mode, or in a Simplex System, operation stops when any of the
above errors occur.
3. When the mode is switched from Duplex Mode to Simplex Mode due to an
operation switching error or a duplex error, the cause of the mode switch
and the time at which it occurred are stored in the Auxiliary Area of the
newly active CPU Unit (i.e., the active CPU Unit following the mode
switch).
Causes of Mode Switching
Word
A023 A02300
A02301
A02303
A02304
A02306
A02308
A02309
A02312
A02315
Active
(Operation switching error)
Mode switched
CPU stopped.
Bit
ON when mode is switched due to a duplex verification
error.
ON when mode is switched due to a duplex bus error.
ON when mode is switched by the CPU Setting Switch.
ON when mode is switched due to a CPU error (watchdog
timer error).
ON when mode is switched due to a FALS error.
ON when mode is switched due to cycle time overrun
error.
ON when mode is switched due to a program error.
ON when mode is switched due to a fatal Inner Board
error.
ON when mode is switched due to a memory error.
Section 3-1
Description