Diagnostic LEDs

After switching on, the Bus Coupler 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 terminals is indicated. The error code can be determined from the frequency and number of blinks. This permits rapid rectification of the error.

The Bus Coupler 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.

On the upper right hand side of the Bus Couplers are two more green LEDs that indicate the supply voltage. The left hand LED indicates the presence of the 24 V supply for the Bus Coupler. The right hand LED indicates the presence of the supply to the power contacts.

LEDs for power supply diagnostics

LED	Meaning
Left LED off	Bus Coupler has no power
Right LED off	No power supply 24 V_DC connected at the power contacts

LEDs for fieldbus diagnosis

The four upper left LEDs indicate the operating status of the INTERBUS communication.

Ready	BA	RC	RD	Meaning	Remedy
on	off	off	off	The Bus Coupler is operational
on	on	on	off	Remote bus active Data transmission with master running
on	off	on	off	Incoming remote bus connection is established, no communication
on	on	off	on	Remote continuation bus is switched off due to cable fault or by the master	Find cable interruption or short circuit, switch over master
off	off	off	off	No function, power failure

LEDs for K-bus diagnostics

Two LEDs, the "I/O LEDs", in the area below the fieldbus status LEDs referred to above, serve to indicate the operating status of the Bus Terminals and the connections to these terminals. The green LED lights up in order to indicate fault-free operation. "Error-free" means that the communication with the fieldbus system is also running. The red LED blinks with two different frequencies in order to indicate an error. The error is encoded in the blinks as follows:

Flashing Codes

Fast blinking	Start of the error code
First slow sequence	Error code
Second slow sequence	Error code argument

Start of the Error Code Error code Error argument

Error code	Error code argument	Description	Remedy
Persistent, continuous flashing		EMC problems	- Check power supply for overvoltage or undervoltage 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 pulse	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 pulses	0	Programmed configuration has an incorrect table entry	Check programmed configuration for correctness
2 pulses	n (n > 0)	Table comparison (Bus Terminal n)	Incorrect table entry
3 pulses	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 pulses	0	K-bus data error, break behind the Bus Coupler	Check whether the n+1 Bus Terminal is correctly connected; replace if necessary.
4 pulses	n	Break behind Bus Terminal n	Check whether the KL9010 Bus End Terminal is connected
5 pulses	n	K-bus error in register communication with Bus Terminal n	Exchange the n^th Bus Terminal
6 pulses	0 ,n (n>0)	Data width more than 32 words at the Bus Coupler	Reduce the fieldbus data
7 pulses *	0	Note: cycle time was exceeded (see Table 1, Register 17)	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 pulses *	0	Checksum error in Flash program	Transmit program to the BC again
9 pulses *	1	Incorrect or faulty library implemented	Remove the faulty library
10 pulses *	n	Bus Terminal n is not consistent with the configuration that existed when the boot project was created	Check the n^th Bus Terminal. The boot project must be deleted if the insertion of an n^th Bus Terminal is intentional.
14 pulses	n	n^th Bus Terminal has the wrong format	Start the Bus Coupler again, and if the error occurs again then exchange the Bus Terminal
15 pulses	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 pulses	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

The number of pulses in the fault segment indicates the position of the last Bus Terminal before the fault. Passive Bus Terminals, such as a power feed terminal without diagnostics, are not included in the count. When the error is rectified, the Bus Coupler does not stop flashing. The Bus Coupler stays in the "Stop" state. The Bus Coupler can only be re-started by switching the power supply off and on again. Insertion and removal of Bus Terminals is only permitted when switched off. The electronics in the Bus Terminals and in the Bus Coupler are protected to a large measure against damage, but incorrect function and damage cannot be ruled out if they are plugged in under power.