BECKHOFF FC5101 - Manual (Page 17)

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17
· corresponds to the DeviceNet "Thin Cable" specification
Screening
The screen is to be connected over the entire length of the bus cable, and only galvanically grounded at one
point, in order to avoid ground loops.
The design of the screening, in which HF interference is diverted through R/C elements to the mounting rail
assumes that the rail is appropriately earthed and free from interference. If this is not the case, it is possible that
HF interference will be transmitted from the mounting rail to the screen of the bus cable. In that case the screen
should not be attached to the couplers - it should nevertheless still be fully connected through.
Notes related to checking the CAN wiring can be found in the Trouble Shooting section.
Cable colours
Suggested method of using the Beckhoff CAN cable on Bus Terminal and Fieldbus Box:
BK51x0
pin Fieldbus Box
pin FC510x
pin
Function
ZB5100 cable co-
lour ZB5200 cable co-
lour
1 3 3 CAN
Ground
black/ (red) black
2 5 2 CAN Low black blue
3 1 5 Screen Filler strand Filler strand
4 4 7 CAN high white white
5 2 9 not used (red) (red)
FC510x: D-sub, 9 pin
The CAN bus cable is connected to the FC5101 and FC5102 CANopen PCI cards via 9-pin sub-D sockets, with
pins assigned as follows.
Pin Assignment
2 CAN low (CAN-)
3 CAN ground (internally connected to pin 6)
5 Screen
6 CAN ground (internally connected to pin 3)
7 CAN high (CAN+)
The unlisted pins are not connected.
Note: An auxiliary voltage of up to 30 V DC may be connected to pin 9. Some CAN devices use this to supply
the transceiver.