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.
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