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CAN, CANopen

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Antall enheter er begrenset til 127 siden CANopen deler den 11-biters CAN-rammen i en 4-biters funksjonskode og 7-biters

funksjonskode og en 7-bits CANopen-ID, noe som gir oss 128 unike ID-er, der 0 er for broadcast og 127 for enheter.

and DeviceNet all comply with the CAN data link layer. The link layer specifies the CAN data frames which has an 11 bit identifier field.

The CANopen protocol uses 7bit of the 11bit CAN-ID as Node-IDs, this gives it 127 possible Nodes as the 0 address is reserved for broadcast.

CANopen also supports extended frame IDs of CAN2.0B, but is rarely used.

DeviceNet can have up to 64 nodes connected to a network, but Classical CAN is the only thing allowed and there is no usage of remote framesenheter. Det finnes også CAN 2.0B som tillater utvidede ramme-ID-er på 29 bits.