Siemens FM 450-1 - Errors and Diagnostics; Chapter Overview; Faults Indicated Via the Diagnostics Leds

Errors and diagnostics
11
11.1 Chapter overview
Chapter overview
Errors can occur owing to operator errrs or incorrect wiring which the module must
communicate to the user.
The errors and faults are divided into the following classes on the module:
• Faults displayed by the diagnostics LEDs that indicate internal and external module faults.
• Faults that can trigger a diagnostics interrupt.
• Operator errors caused by incorrect operation.
The di󹪜erent classes of errors are indicated and displayed in di󹪜erent positions and must be
acknowledged in di󹪜erent ways.
This chapter describes
• which errors and faults can occur,
• where these errors and faults are displayed and
• how you acknowledge them.
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 Cause of fault Correction
Internal fault
INTF diagnostics LED
Fault in EPROM TEST Module replacement
Fault in RAM TEST Module replacement
Watchdog has responded Module replacement
Process interrupt lost Is acknowledged by processing the process in‐
terrupt.
Counter module FM 450-1
Equipment Manual, 03/2022, A5E03648739-AC 91