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4-20 Input / Output MN1904
4.7.7 CAN connectors - X16 & X17
CAN (Controller Area Network) offers very reliable serial communications over a two wire
twisted pair cable. In an industrial environment, the probability of an undetected error is
4.7x10
-11
. CAN also of fers high speed data transfer (up to 1Mbit/s, dependent on bus length)
and low cost multiplex wiring schemes. CAN is optimized for the transmission of small data
packets and therefore of fers fast update of I/O devices (peripherals) connected to the bus.
The CAN network allows several CAN peripheral devices to be attached to the same
controller.
The CAN connectors provide access to CANopen (CAN1) and Baldor CAN (CAN2) busses on
two separate connectors. Both busses are available on both connectors to simplify
“daisy-chaining” of peripherals.
Location
Top panel, connectors X16 & X17
Pin Name Description
1 CAN1+ CANopen
2 CAN1- CANopen
3 (NC) Not connected
4 CAN 0V Ground/earth reference for CAN signals
5 CAN V+ CAN remote node power V+ (12-24V)
6 (NC) Not connected
7 CAN2+ Baldor CAN
8 CAN2- Baldor CAN
Description
CAN interfaces using RJ45 connectors.
Correct operation of CAN can only be achieved with screened/shielded twisted-pair cabling.
CAN1+ / CAN1- and CAN2+ / CAN2- must form twisted pairs with the shield connected to the
connector backshell, as shown in Figure 13. A range of suitable CAN cables are available
from Baldor, with catalog numbers beginning CBL004-5...
2
1
5
4
NextMove BX
II
1
2
7
Baldor HMI
Operator Panel
Twisted pai r Twisted pairs
T
R
T
R
End node
2
1
5
4
2
1
5
4
2
1
5
4
2
1
5
4
NextMove BX
II
2
Figure 13 - Typical CAN network connections
1
8