FM 456-2 Functions and Technical Data
4-6
FM 456-2 Application Function Module Installation, Hardware, and Startup
C79000-G7076-C458-01
4.4
Status and Fault Indicators
Status and Fault Indicators
The FM 456-2 is provided with the following status and fault indicators:
INTF
EXTF
SD
HD
USR1
USR2
RUN
STOP
Figure 4-3
Status and Fault Indicators on the FM 456-2
Meaning of Status and Fault Indicators
The status and fault indicators are explained in Table 4-4 in the order in which they
are arranged on the FM 456-2 application function module.
Table 4-4
Meaning of the Status and Fault Indicators on the FM 456-2
Indicator
Meaning
Description
INTF (red)
EXTF (red)
Internal or external alarm
lights in the event of
Hardware faults
Firmware faults
Parameter assignment faults
Computational faults
Timer faults
Memory card faults
I/O faults.
Use the PG to determine the exact
nature of the fault (read diagnosis
buffer).