Beckhoff BK3120

[lapgoch]

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Hi.

When I apply power to a Beckhoff BK3120 coupler the only led indication I get is the I/O ERR led.
Nothing on the RUN, BF or DIA leds.
There are no IO modules attached and no Profibus connected.
Is the coupler faulty?

 

[oliver.tonn]

I don't know the coupler, but to which connectors did you have applied power?

 

[lapgoch]

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Just 24v to the coupler power terminals.

 

[oliver.tonn]

Hi.

When I apply power to a Beckhoff BK3120 coupler the only led indication I get is the I/O ERR led.
Nothing on the RUN, BF or DIA leds.
There are no IO modules attached and no Profibus connected.
Is the coupler faulty?

No, that is normal, according to the manual from Beckhoff. If no master is connected, these LEDs are off.

 

[JSEngineering]

Do you need for Beckhoff a Bus-Termination-Module which might be missing and due to the fact that you have the BK only, now it displays a fault because of open bus?

 

[oliver.tonn]

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Just 24v to the coupler power terminals.

To which terminals exactly?

 

[oliver.tonn]

Do you need for Beckhoff a Bus-Termination-Module which might be missing and due to the fact that you have the BK only, now it displays a fault because of open bus?

Yes, this module is mandantory for the K-Bus and that might be the cause for the I/O-Error. The I/O-Error LED has a blink code which specifies the current error. The code is also described in the manual.

 

[lapgoch]

Here are the power connections

 

[lapgoch]

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Looking at the same coupler on Ebay with power applied with no profibus or termination module other leds are lit.

 

[oliver.tonn]

Here are the power connections

OK, that is correct. One of the classic errors when working with Beckhoff is that people use only one of the power terminals, but you did it right.
So everything seems to be fine. No master is connected, thats why the upper LEDs are off, and no terminal is connected, thats why the I/O-Error LED is on.

 

[automation-consult]

i think you need a additional Endterminal

 

[oliver.tonn]

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Looking at the same coupler on Ebay with power applied with no profibus or termination module other leds are lit.

Anhang anzeigen 74812

Take a closer look at the picture and you might find the difference. This difference might be the reason why the LEDs are lit, but as I wrote before, I don't know this coupler. The reason might also be an older firmware, because according to the manual, the upper LEDs should be off.

 

[automation-consult]

KL9010 | End terminal​

 

[lapgoch]

OK. I have tried with profibus connected but no IO or terminator. I will try with a full setup.

 

[lapgoch]

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Its still the same. Any thoughts?

 

[oliver.tonn]

Its still the same. Any thoughts?

It seems, that you don't know the difference between KL-terminals and EL-terminals. What you have added is a EL end cap and not the KL-9010 End Terminal, which you needed. The BK coupler only supports K-Bus terminals with KL-XXXX and no E-Bus terminals.
By the way, the EL-9011 is only a cap/plate and not a terminal.

 

[lapgoch]

I just realised that. I dont have a KL-9010 to try. It did seem weird that the 9011 would make any difference.

 

[oliver.tonn]

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I just realised that. I dont have a KL-9010 to try. It did seem weird that the 9011 would make any difference.

By the way, which terminals should be later mounted to the coupler?

 

[automation-consult]

the KL Bus System need a KL9010 Endterminal .. the K-Bus = a kind of RS485 and need a resistor at the End

 

[automation-consult]

the EL9011 is only a protector for the pins (picture further up), the EL-Bus System EtherCAT work without end terminals