Connections - Beckhoff CX1500-M510 Manual

Assembly and connecting
2. Assembly and connection to the CX1000/CX1020 configuration
Since the CX1000 configuration is already positioned on the top-hat rail, the assembly first has to be pushed
onto the top-hat rail. To this end the latching mechanism has to be released by pulling the white straps
downwards.
The assembly is connected to the existing CX1000/CX1020 configuration by simply plugging the two units
together. Care must be taken that the plug of the PC104 interface is not damaged.
When correctly assembled, no significant gap can be seen between the attached housings. Finally, the white
straps are returned to their original position, so that the locking mechanism engages.
3. Install cover
If the connection area does not have a closing cover on the left-hand side, the cover that was previously
removed should be pressed over the connections until it audibly engages.
Note:
If the CX1000/CX1020 configuration is not positioned on the top-hat rail, it is possible to connect the
assembly with the CX1000/CX1020 configuration first and then latch the whole module onto the top-hat rail.
The installation is described in section Installation and wiring [} 178].
Note:
A locking mechanism prevents the individual housings from being pulled off again.
4.1.3

Connections

CAN topology
CAN topology
CAN is a 2-wire bus system, to which all participating devices are connected in parallel (i.e. using short drop
lines). The bus must be terminated at each end with a 120 (or 121) Ohm terminating resistor to prevent
reflections. This is also necessary even if the cable lengths are very short!
Since the CAN signals are represented on the bus as the difference between the two levels, the CAN leads
are not very sensitive to incoming interference (EMI): Both leads are affected, so the interference has very
little effect on the difference.
CX1500-M510, CX1500-B510 Version: 1.0 159