3 Product Description F30 03
Page 16 of 46 HI 800 473 E Rev. 1.00
3.4.1 LED Indicators
The light-emitting diodes (LEDs) indicate the operating state of the controller. The LEDs are
classified as follows:
Operating voltage LED
System LEDs
Communication LEDs
I/O 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
3.4.1.1 Operating Voltage LED
LED Color Status Description
On 24 VDC operating voltage present 24 VDC Green
Off No operating voltage
Table 5: Operating Voltage LED
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