Diagnostic LEDs

The Bus Coupler features status indicator LEDs. The row of LEDs on the left describes the status of the fieldbus and of the PLC. The row of LEDs on the right indicates the supply voltage and the K-Bus state.

Diagnostic LEDs 1: — LEDs

LEDs for power supply diagnostics

LED (Power LEDs)	Meaning
LED Us	LED off: Bus Coupler has no voltage 24 V_DC
LED Up	LED off: No 24 V_DC power supply connected to the power contacts

LEDs for K-Bus diagnostics

LED (Power LEDs)	Meaning
LED RUN	LED off: no K-Bus update, LED on, flashing: K-bus running
LED ERR	LED off: no error, LED flashing: see K-Bus error code

K-Bus error code diagnostics

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 localized by a restart of the coupler (by switching it off and then 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 Bus Coupler
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 Bus Coupler	Check whether the n+1 Bus Terminal is correctly connected; replace if necessary.
4	n	Break behind Bus Terminal n	Check whether the KL9010 Bus End Terminal is connected
5	n	K-bus error in register communication with Bus Terminal n	Exchange the nth Bus Terminal
6	0	Error at initialization	Exchange Bus Coupler
	1	Internal data error	Perform a hardware reset on the Bus Coupler (switch off and on again)
	2	DIP switch changed after a software reset	Perform a hardware reset on the Bus Coupler (switch off and on again)
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 Bus Coupler again. Remedy: increase the cycle time
9	0	Checksum error in Flash program	Re-transfer the program to the Bus Terminal Controller
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 Bus Coupler again, and if the error occurs again then exchange the Bus Terminal
15	n	Number of Bus Terminals is no longer correct	Start the Bus Coupler again. If the error occurs again, restore the manufacturers setting using the KS2000 configuration software
16	n	Length of the K-bus data is no longer correct	Start the Bus Coupler again. If the error occurs again, restore the manufacturers setting using the KS2000 configuration software

LED bus - fieldbus diagnostics

LED	Meaning
LED RUN	no fieldbus connected, Bus Coupler searches for baud rate
LED BF	error flashing - error type - display
LED DIA	Bus Coupler has found baud rate, waiting for config and parameter data

LED RUN	LED BF	LED DIA	Meaning
off	off	off	no fieldbus connected, Bus Coupler searches for baud rate
on	on	on
on	on	off	Bus Coupler has found baud rate, waiting for config and parameter data
on	off	off	no error, coupler in data exchange
on	off	flashing	error, see error code

LED PLC - PLC diagnostics

LED	Meaning
PLC LED	LED on: PLC running, LED off: PLC stopped