3 Product Description CPU 03
Page 14 of 38 HI 800 479 E Rev. 1.00
3.4.3 LED Indicators
The light-emitting diodes (LEDs) indicate the operating state of the device. The LEDs are
classified as follows:
System LEDs
Program LEDs
Communication LEDs
Fieldbus LEDs
When the supply voltage is switched on, a LED test is performed and all LEDs are briefly lit
simultaneously.
Definition of Blinking Frequencies
The following table defines the blinking frequencies of the LEDs:
Name Blinking frequencies
Blinking1 Long (approx. 600 ms) on, long (approx. 600 ms) off
Blinking-x Ethernet communication: Blinking in sync with data transfer
Table 4: Blinking Frequencies of LEDs
3.4.3.1 System Light Emitting Diodes
While the controller is being booted, all LEDs are lit simultaneously.
LED Color Status Description
On Module in STOP or RUN, normal operation
Blinking1 A new operating system is being loaded.
RUN Green
Off The controller is not in the RUN state.
On
The controller is in the ERROR STOP state
Internal module faults detected by self-tests, e.g., hardware,
software or voltage supply.
The processor system can only be restarted with a command from
the PADT (reboot).
ERR Red
Off No faults detected.
Table 5: System Light Emitting Diodes
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