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Faults and Diagnostics
13.1 Fault Indication via the Diagnostics LEDs
Where is the Fault
Indicated?
Which Faults are
Indicated?
Type of Fault/LED
Internal faults
INTF Diagnostics LED
External faults
EXTF diagnostics LED
Initiating a
Diagnostics
Interrupt
13
13-2
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If one of the two red diagnostics LEDs lights up, a fault has occurred either
on the module (internal fault = INTF diagnostics LED) or at the cable con-
nections (external fault = EXTF diagnostics LED).
The following faults are indicated by the diagnostics LEDs lighting up:
Cause of Fault
Fault in EPROM TEST
Fault in RAM TEST
Watchdog tripped
Lost process interrupt
Auxiliary voltage 1L+/1M not connected
or 24 VDC encoder supply short-cir-
cuited
5.2 VDC encoder supply short-circuited
or overloaded
Fault in 5 V encoder signals (wirebreak,
short-circuit, cable missing)
All faults except the EPROM test fault, can initiate a diagnostics interrupt
provided you have enabled the diagnostics interrupt in the relevant parameter
assignment screen form. You can see which fault has caused the LED to light
up from the diagnostics data sets DS0 and DS1. The assignments of the diag-
nostics data sets DS0 and DS1 are described in the next section.
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Remedy
Change module
Change module
Change module
Acknowledged by process interrupt han-
dling
Correct connection
Correct connection
Correct connection
FM 450-1 Counter Function Module
C79000-G7076-C450-01
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