Diagnostic LEDs

The Bus Coupler has two groups of LEDs for the display of status. The "DIAG LEDs" on the left indicate the fieldbus, PLC and K-Bus state. Two green LEDs (Power LEDs) are located in the top right corner of the Bus Coupler. They are used for displaying the supply voltage of the BX Controller and the 24 V_DC supply of the power contacts.

LEDs for power supply diagnostics

LED (Power LEDs)	Meaning
Left LED off	Bus Coupler has no voltage 24 V_DC
Right LED off	No power supply 24 V_DC connected at the power contacts

Diagnostic LEDs 1: — Diagnostic LEDs for the fieldbus, the PLC, the K-bus and the power supply units

The DIAG LEDs are sub-divided as follows:

Bus: Fieldbus diagnosis
PLC: PLC diagnosis
I/O: K-bus diagnosis

The LEDs can be off, green, orange or red.

Diagnostic LEDs 2: — Diagnostic LEDs for the fieldbus, the PLC and the K-bus

After switching on, the Bus Coupler immediately checks the connected configuration. The I/O LED goes out if the start-up was successful. A red I/O LED indicates a Bus Terminal error. The error type is shown in the display. This permits rapid rectification of the error.

LED bus - fieldbus diagnosis

LED	Meaning
LED off	no fieldbus connected, Bus Coupler searches for baud rate
LED red	error flashing - error type - display
LED orange	Bus Coupler has found baud rate, waiting for config and parameter data
LED green	Bus communication OK, BX Controller is exchanging data

LED PLC - PLC diagnosis

LED	Meaning
LED off	PLC stop or no program available
LED red	Flashing - the set task time is exceeded from time to time On - the set task time is always exceeded Disable the red LED
LED orange	PLC running without boot project (only during the on cycle), LED flashes orange during creating of the boot project
LED green	Boot project - PLC running (only during the on cycle)

LED I/O - K-Bus diagnosis

LED	Meaning
LED off	No data are exchanged via the K-Bus
LED red	error flashing - error type - display
LED orange	Register or KS2000 online access
LED green	K-Bus OK and running

Error codes for K-Bus diagnosis

Error code	Error argument	Description	Remedy
0	-	EMC problems	Check power supply for undervoltage or overvoltage peaks Implement EMC measures If a K-Bus error is present, it can be located by a restart (switching the BX controller off and on again)
1	0	EEPROM checksum error	Enter factory settings with the KS2000 configuration software
	1	Code buffer overflow	Insert fewer Bus Terminals. Too many entries in the table for the programmed configuration
	2	Unknown data type	Software update required for the BX Controller
2	-	Reserve	-
3	0	K-bus command error	No Bus Terminal inserted One of the Bus Terminals is defective; halve the number of Bus Terminals attached and check whether the error is still present with the remaining Bus Terminals. Repeat until the defective Bus Terminal is located.
4	0	K-Bus data error, break behind the BX Controller	Check whether the n+1 Bus Terminal is correctly connected; replace if necessary.
4	n	Break behind Bus Terminal n	Check whether the Bus End Terminal KL9010 is connected.
5	n	K-bus error in register communication with Bus Terminal n	Exchange the nth bus terminal
6	0	Error at initialization	Replace the BX controller
	1	Internal data error	Hardware reset of the BX controller (switching off and on again)
	2	DIP switch changed after a software reset	Hardware reset of the BX controller (switching off and on again)
	3	IP address collision	Check whether the IP address already exists in the network.
7	0	Note: cycle time was exceeded	Warning: the set cycle time was exceeded. This indication (flashing LEDs) can only be cleared by booting the BX Controller again. Remedy: increase the cycle time
9	0	Checksum error in Flash program	Transfer the program to the BX controller again
9	1	Incorrect or faulty library implemented	Remove the faulty library
10	n	Bus Terminal n is not consistent with the configuration that existed when the boot project was created	Check the nth Bus Terminal. The boot project must be deleted if the insertion of an nth Bus Terminal is intentional
14	n	nth Bus Terminal has the wrong format	Start the BX Controller again, and if the error occurs again then exchange the Bus Terminal.
15	n	Number of Bus Terminals is no longer correct	Restart the BX controller. If the error occurs again, reset the BX controller to the delivery state with the configuration software.
16	n	Length of the K-bus data is no longer correct