1. Fbb-x900 Ethernet
2. Error Handling and Diagnosis
3. Diagnostic LEDs for Ethernet

Diagnostic LEDs for Ethernet

After switching on, the Fieldbus Box  immediately checks the connected configuration. Error-free start-up is indicated when the red I/O ERR LED goes out. If the I/O ERR LED blinks, an error in the area of the Inputs/Outputs is indicated. The error code can be determined from the frequency and number of blinks. This permits rapid rectification of the error.

The module has two groups of LEDs for the display of status.
The upper group with four LEDs indicates the status of the respective fieldbus. The significance of the fieldbus status LEDs is explained in the appropriate sections of this manual. It corresponds to the usual fieldbus display.

At the lower end of the Module are two more green LEDs that indicate the supply voltage. The left hand LED indicates the presence of the 24 V_DC supply for the Fieldbus Box. The right hand LED indicates the presence of the supply to the power contacts.

LEDs for power supply diagnosis

LED	In	Out
LINK	Physical connection present	No physical connection present
ACTIV	Flashing: Bus traffic present	No bus traffic (bus idle)
ERROR	The LED flashes slowly if DHCP or BootP is active but the Bus Coupler has not yet received an IP address The LED flashes rapidly (5 times, only when switching on); the Bus Coupler is addressed with ARP. The settings on the rotary switches are not valid.	No error.
	ON, when the box receives more than one Ethernet frame per module cycle. The master sends to fast!
WD	Out - Watchdog error or no communication	- Start communication - reset WD error
	On - Watchdog works	No error