CANFB0812 pg. 1/1
CAN Copper to Fiber Converter
Model CANFB
Model CANFB isolates and protects your CAN (Control Area Network) system
from component killing surges and transients in a noisy and harsh environment. The
CANFB is a copper to fiber converter that provides optical isolation for the CAN
system. This separates and protects critical segments of the system from the rest of
the CAN network. It is protocol independent, allowing it to work with all the different
CAN protocols and frame lengths. The Model CANFB converter is used in pairs, one
for each side of the fiber.
The CAN side is connected to the system through terminal blocks. The fiber is connected though ST
connectors. A power supply of 10-30 VDC is required. Model CANFB is housed in a rugged DIN-Rail mountable
box, making it easy to install in an industrial cabinet.
CAN_L
Isolated
CAN_L
CAN_H
CAN_H
CAN Node
GND
GND
Fiber
CAN Network
CANFB CANFB or
GND GND
Can Network
10-30VDC 10-30VDC
Power Power
Supply Supply
The CAN network must be terminated at both ends according to the CAN specification. Networks not
properly terminated may have data errors or miss the data completely. The CANFBs create two new ends to the
CAN network. Space is provided on the board for a termination resistor, R8. A 120-ohm resistor is
recommended for the termination. If the CANFB is not at the end of the network, it should not be terminated.
The CANFB is bit-wise enabled, allowing it to automatically adjust for different baud rates. The bit-wise
enable only enables the driver on every low bit received. It also disables the driver on the receive side for the low
bit plus a maximum of 2 sec. This prevents data from echoing back from the CANFB, but allows the nodes to
respond back. The maximum length of fiber used depends on the baud rate, CANFB and length of copper wire
used. The CAN bus required a response in one bit time.
Specifications
Max. Baud Rate: 250k baud
Fiber: 50/125 m, 62.5/125 m, 100/140 m, 200 m HCS fiber
Power Supply: 10 to 30 VDC
Power: Approx. 150mA @ 12V fully loaded
Isolation: 2000 VDC
Turnaround: < 2 sec.
LEDs: 1 TD, 1 RD. (may be hard to see at the higher baud rates)
Dimensions: 4.0 x 3.4 x 1.4 in (9.3 x 8.6 x 3.6 cm)
o o
Temperature Range: 0 C to 70 C
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