10
2-1
Indicators
CPU and Duplex Unit indicators provide visual information on the general
operation of the PC. Although not substitutes for proper error programming
using the flags and other error indicators provided in the data areas of mem-
ory, these indicators provide ready confirmation of proper operation.
CPU indicators are shown below and are described in the following table.
Indicators are the same for both C1000H and C2000H.
Indicator
Function
POWER
Lights when power is supplied to the CPU.
RUN
Lights when the CPU is operating normally.
ERR
Lights when an error is discovered in error diagnosis operations.
When this indicator lights, the RUN indicator will go off, CPU
operation will be stopped, and all outputs from the PC will be
turned OFF.
ALARM
Lights when an error is discovered in error diagnosis operations.
PC operation will continue.
OUT INHB
Lights when the Output OFF bit, SR bit 25215, is turned ON. All
outputs from the PC will be turned OFF.
SYSMAC C2000H
PROGRAMMABLE CONTROLLER
POWER
RUN
ERR
ALARM
OUT INHB
CPU Indicators
Indicators
Section 2-1