11
Duplex Unit indicators are shown and described below. Refer to the
C1000H/C2000H Installation Guide
for details. Duplex operation is only avail-
able on C2000H Units.
Indicator
Function
DUPLEX RUN
Lights when the Duplex Unit is operating normally.
DUPLEX BUS
ERROR
Lights when an error has occurred in the Duplex Unit bus. The
DUPLEX RUN indicator will go out and the active CPU will switch
to simplex operation.
VERIFY
ERROR
Lights when the two CPUs do not contain the same program. The
DUPLEX RUN indicator will go out and the active CPU will switch
to simplex operation.
ACTIVE CPU
Indicate which CPU is active.
CPU RUN
Lights whenever the RUN indicators on the CPUs are lit.
WAITING
Lights at the beginning of duplex operation until the programs
have been verified (1 to 20 seconds). Will remain lit if program
execution does not start properly or if an error occurs in starting
duplex operation.
PROGRAM
Lights when the PCs are in PROGRAM mode.
CPU ERROR
Lights when CPU errors occur in the CPUs. CPU operation will
stop and the CPU RUN indicator will go out.
MEMORY
ERROR
Lights when memory errors occur in the CPUs. CPU operation
will stop and the CPU RUN indicator will go out.
MEMORY ERROR
DPL01 DUPLEX UNIT
SYSTEM
CPU
LEFT
RIGHT
ACTIVE CPU
CPU RUN
WAITING
PROGRAM
CPU ERROR
DUPLEX BUS ERROR
VERIFY ERROR
DUPLEX RUN
Duplex Unit Indicators
Indicators
Section 2-1
