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CAN cut-off relay

The CAN cut-off relay by Miunske (Germany) comes into action always then when the CAN network needs to be interrupted in a machine.

(Photo: Miunske)

ALTHOUGH THE COMMERCIAL VEHICLE SECTOR already offers a variety of specific machines and vehicles, equipment flexibility remains to be a key requirement. For this reason, interfaces are available to connecting further application-specific devices. Since these however have an effect on the whole bus system, adaptations will become necessary on exceeding specific criteria, such as different lengths of connecting leads. The necessary correction of the electric parameters can be done using an isolating CAN cut-off relay. This designation is admittedly somehow confusing.

The reason is that the relay has nothing to do with CAN at all. Any messages are neither received nor transmitted by it. It solely reacts to a digital signal that is externally applied. The reason why it is designated nevertheless that way is in fact originated by its function. It comes into action always then when the CAN network needs to be interrupted in a machine. This has an obvious reason. The CAN network is normally applied in linear topology to which the bus system has been designed for.

Later on, optional equipment is connected to it, the connecting leads of which could however be up to some meters long. The leads will then become a mixed or star topology. However, in order to be able to maintain the original topology, the CAN network isolating relay was developed. A coded plug will tell the relay whether or not it has to energize when optional equipment is being connected. The CAN signal is additionally tapped off upstream of the isolating relay and lead to the consumer. On its return path, the signal will then be fed in again down-stream of the relay.

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Kvaser Sontheim