User`s manual

Westrn Reserve Controls WRC-CANR-DF-DN User’s Manual
PUB 14.1
1
1. Overview
The WRC-CANR-DF Fiber Optic CAN Bus Extender converts a copper cable medium CAN-Bus
network to a fiber optic medium. The WRC-CANR-DF-DN is always used in pairs and, along with the fiber
optic cable set, inserts a length of fiber media into the copper CAN Bus network. The primary purposes of
this type of configuration is to extend the maximum length defined for one continuous network cable bus up
to 2.2km and to provide network protection from external, high-energy electrical interference, such as
lightning storms, arc welders, etc. They can be connected in a bus trunk line or drop line.
A WRC-CANR can be used for quite a number of helpful purposes, including
• To provide an electrically-isolated fiber transmission segment to your CAN bus for more
secure network in high-energy environmental conditions
• to extend the network beyond its absolute maximum length (e.g., up to 2200 meters
additional length) at the slowest speed
• to implement a longer network for a given baud rate (e.g., pushing a 500K baud network
beyond 100 m for DeviceNet)
• to provide higher speed baud rates for a given network length
• to extend the length of the drop cable (e.g., longer drops than 6 m for DeviceNet)
• to provide 2600V electrical isolation between the 2 sub-nets
• to create a unique network topology instead of a conventional bus structure, such as a star
configuration
The Extenders are transparent to the other nodes on the bus. They receive and actively re-transmit
(store-and-forward) each message received at either side of the network without interpreting the message or
acting upon it. The Fiber Extenders perform all appropriate CAN Bus arbitration on the copper bus as it re-
transmits the message.
The WRC-CANR-DF-DN is a member of WRC’s family of products that extend the system
communications lengths for DeviceNet, CANopen, SDS (Smart Distributed System) and other CAN, V2.0,
Part A or Part B, serial bus systems. By allowing the user to extend the bus length for any given speed,
they assist the user in cost-effectively implementing I/O or other nodes on these buses at remote locations
that would be more difficult or more expensive to do otherwise.
The unit derives its power through the copper network connector on Side A.
1.1. Series 3 Specific Features
The Series 3 CANR provides enhancements over previous versions. Enhancements include:
• Up to 2.2 km fiber lengths
• CAN 2A and 2B, and remote frame, support
• Up to 1M Baud CAN bus operation available
• Enhanced Autobaud operation
• Either unit in a pair can Autobaud from the other units defined baud rate