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CAN repeater example
CAN repeater networks
CAN Gateway vs. Repeater
|for xx/.. values see |
inhibition time explanation
CAN-Repeater CRep S8C
- Protocol transparent CAN repeater
- 8 CAN channels
- Low propagation delay
- Links for cascading up to 3 devices with one supply
- ISO 11898 compatible bus interface
- Detach of dominant locked bus segments
- Rail mountable
The compact CAN repeater CRep S8C transmits and amplifies signals transparent to the CAN protocol. Each of the eight CAN connections has the physical behaviour of a single bus node. CRep S8C permits a flexible design of the network topology and offers special support for star structured networks. Furthermore tree structures and long stub lines are supported. Through the possibility to use the network structure that fits the application best a reduction of installation costs can be reached. The maximum data rate in CAN networks, depending on signal propagation delays, can be increased, if CRep S8C is used to improve the network structure. An increase of the maximum node count in a CAN network can be reached by splitting the network in subnets that are connected by CRep S8C. Each subnet makes the number of CAN nodes possible permitted by the drivers output current. Where CAN signals have to be transmitted over long distances, CRep S8C can be used for signal conditioning. The capability to detach erroneous segments from the rest of the CAN system reduces the impact on the intact bus segments for the most commonly occuring errors. The presence of power is indicated by a LED. Furthermore each CAN channel is provided with a LED indicating that this channel has originated a CAN message when the LED is on.
Layout and Connection
A CRep S8C device includes 8 CAN segments, wired by terminal blocks with 3 clamps. The power supply of CRep S8C is separately wired by a terminal block with 2 clamps.
|1||CAN_H||CAN high bus line|
|2||CAN_L||CAN low bus line|
The following table shows the terminal assignment of the power connector:
|1||Power +||Positive supply +24V|
The power supply is galvanicly decoupled from the CAN system.
|Power supply voltage||-100||+35||V|
|Voltage on signal lines||-30||+30||V|
|Maximum power dissipation (at 60°C)||n.s.||tbd||mW|
Any (also temporary) stress in excess of the limiting values may cause permanent damage on CRep S8C and other connected devices. Exposure to limiting conditions for extended periods may affect the reliability and shorten the life cycle of the device.
|Current consumption (running idle)||n.s.||70||n.s.||mA|
|Current consumption (250 kBits/s, 100% busload)||n.s.||tbd||n.s.||mA|
|Propagation delay between two arbitrary channels||n.s.||130||200||ns|
|Propagation delay cascade||n.s.||8||10||ns|
All values, unless otherwise specified, refer to a supply voltage of 24V and an environmental temperature of 20°C.