BECKHOFF FC5101 - Manual (Page 18)

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BK51x0: 5- pin open style connector
The BK51x0 Bus Couplers have a recessed front surface on the left hand side with a five pin connector.
The supplied CANopen socket can be inserted here.
The left figure shows the socket in the BK51x0 Bus Coupler. Pin 5 is the connection strip's top most pin. Pin 5 is
not used. Pin 4 is the CAN high connection, pin 2 is the CAN low connection, and the screen is connected to
pin 3 (which is connected to the mounting rail via an R/C network). CAN-GND can optionally be connected to
pin 1. If all the CAN ground pins are connected, this provides a common reference potential for the CAN trans-
ceivers in the network. It is recommended that the CAN GND be connected to earth at one location, so that the
common CAN reference potential is close to the supply potential. Since the CANopen BK51X0 Bus Couplers
provide full electrical isolation of the bus connection, it may in appropriate cases be possible to omit wiring up
the CAN ground.
ZS1052-3000 Bus Interface Connector
The ZS1052-3000 CAN Interface Connector can be used as an alternative to the supplied connector. This ma-
kes the wiring significantly easier. There are separate terminals for incoming and outgoing leads and a large
area of the screen is connected via the strain relief. The integrated terminating resistor can be switched exter-
nally. When it is switched on, the outgoing bus lead is electrically isolated - this allows rapid wiring fault location
and guarantees that no more than two resistors are active in the network.
LC5100: Bus connection via spring-loaded terminals
In the low cost LC5100 coupler, the CAN wires are connected directly to the contact points 1 (CAN-H, marked
with C+) and 5 (CAN-L, marked with C-). The screen can optionally be connected to contact points 4 or 8,
which are connected to the mounting rail via an R/C network.