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Auxiliary Area
Switching from Duplex to Simplex Operation (Duplex CPU Systems Only)
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Cause of Switching
Name
Duplex Verification Error
Switch Flag
Duplex Bus Error Switch Flag
Duplex Initialization Error
Switch Flag
CPU Unit Setting Switch Flag
CPU Error (WDT) Switch Flag A02304
FALS Instruction Error Switch
Flag
Cycle Time Overrun Switch
Flag
Program Error Switch Flag
Fatal Inner Board Error Switch
Flag (Process-control CPU
Units only)
Memory Error Switch Flag
Address
A02300
ON: A duplex verification error caused a switch from duplex
to simplex operation. Only operation is switched and the
active CPU Unit will not be switched.
This flag is turned OFF when duplex operation is restored.
A02301
ON: A duplex bus error caused a switch from duplex to sim-
plex operation. Only operation is switched and the active
CPU Unit will not be switched.
This flag is turned OFF when duplex operation is restored.
A02302
ON: An error during duplex initialization caused a switch
from duplex to simplex operation and duplex operation was
never started. The active CPU Unit will not be switched.
This flag is turned OFF when duplex operation is restored.
A02303
ON: Changing the CPU Unit's switch from USE to NO USE
caused a switch from duplex to simplex operation. The
active CPU Unit will be switched.
This flag is turned OFF when duplex operation is restored.
ON: A CPU Unit error (WDT) caused a switch from duplex to
simplex operation. The active CPU Unit will be switched.
This flag is turned OFF when duplex operation is restored.
A02306
ON: Execution of an FALS instruction caused a switch from
duplex to simplex operation. The active CPU Unit will be
switched.
This flag is turned OFF when duplex operation is restored.
A02308
ON: Exceeding the cycle time caused a switch from duplex
to simplex operation. The active CPU Unit will be switched.
This flag is turned OFF when duplex operation is restored.
A02309
ON: A program error caused a switch from duplex to simplex
operation.The active CPU Unit will be switched.
This flag is turned OFF when duplex operation is restored.
A02312
ON: A fatal Inner Board error caused a switch from duplex to
simplex operation. The active CPU Unit will be switched.
This flag is turned OFF when duplex operation is restored.
A02315
ON: A memory error caused a switch from duplex to simplex
operation. The active CPU Unit will be switched.
This flag is turned OFF when duplex operation is restored.
The following programming can be used with the flags in A023 to detect when
the system switches from duplex to simplex operation.
<>
A023
#0
If the contents of A023 is not 0, the "duplex error" output is turned ON to indi-
cate that the system has switched to simplex operation.
Description
Duplex error
Section 8-11
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