Faults Indicated Via The Diagnostics Leds - Siemens simatic s7-400 FM 450-1 User Manual

Errors and diagnostics
11.5 Operator error
11.2

Faults indicated via the diagnostics LEDs

Where are the faults displayed?
Faults are indicated by the two red diagnostics LEDs:
● The INTF diagnostics LED displays internal faults of the module.
● The EXTF diagnostics LEDdisplays external faults to the cable connections.
Which fauts are displayed?
The following faults are indicated by the two red diagnostics LEDs lighting up:
Fault type/LED
Internal fault
INTF diagnostics LED
External fault
EXTF Diagnostics LED
Initiation of a diagnostics interrupt
All faults, except for the fault in the EPROM test can initiate a diagnostics interrupt if you
have enabled the diagnostics interrupt in the relevant parameter assignment screen form.
You will find out which fault has caused the LED to light up from the diagnostic data records
DS0 and DS1. The assignment of the diagnostics data records DS0 and DS1 is described in
the next section.
108
Cause of fault
Fault in EPROM TEST
Fault in RAM TEST
Watchdog has responded
Process interrupt lost
Auxilliary voltage 1L+/1M is not connected or
24 VDC encoder supply is short circuited
5.2 VDC encoder supply short circuited or
overloaded
5 V encoder signals faulty (wire breakage,
short circuit, cable missing)
Correction
Module replacement
Module replacement
Module replacement
Is acknowledged by processing the process
interrupt.
Correct connection
Correct connection
Correct connection
Counter module FM 450-1
Manual, 02/2014, A5E03648739-02