KEBA E-CPU-186B Control Circuit Board D1633C

The BL 250/B is a bus coupler of the Kemro-control system

It is used to op-erate modules of the system as decentralized I/O

clusters at other controls.The BL 250/B is connected with a

Host-control or another bus link modulevia K-Net. A maximum of

12 modules can be supplied and operated.

Behavior in case of an error at the BL BL 250/B

If an error occurs during start-up of the BL 250/B, the status LED

will remainon red and/or orange. In this case no K-Net bus traffic

will be possible, themodule must be exchanged.

Error states in the ongoing operation of the BL 250/B are monitored

bywatchdog. If the watchdog is triggered, it will activate a reset on

the BL 250/B and all inputs and outputs of the connected modules

will be reset to theirinitial status. The status LED of the BL 250/B

indicates red, the status LEDsof the other K-Net participants will

indicate green.

Response to module errors

A module error of one of the connected modules (e.g. HW-defect) is

de-tected by the BL 250/B and a corresponding status message is sent

to thebus master. The error is indicated on the status LED (red)

Behavior at sensor failure on a connected module

A sensor failure on an analog input of a connected module is forwarded

asstatus message to the K-Net master. The status LED of the BL

250/Bre-mains on green.