Baldor iMN1921 installation manual Can communication, Typical can network connections

4.6.3 CAN communication

The CAN connection is made using the RJ45 connector on the NextMove ST control card.

1

8

Location	NextMove ST control card
Pin	Name	Description
1	CAN+	CAN channel positive
2	CAN-	CAN channel negative
3	-	(NC)
4	CAN 0V	Ground/earth reference for CAN signals
5	CAN V+	CAN power V+ (12-24V)
6	-	(NC)
7	-	(NC)
8	-	(NC)

Description

Opto-isolated CAN interface using a RJ45 connector.

CAN offers serial communications over a two wire twisted pair cable up to maximum length of 500m (1640ft). It offers very high communication reliability in an industrial environment; the probability of an undetected error is 4.7x10-11. CAN is optimized for the transmission of small data packets and therefore offers fast update of I/O devices (peripheral devices) connected to the bus. The maximum (default) transmission rate on NextMove ST is 500Kbit/s.

Correct operation of CAN can only be achieved with screened/shielded twisted-pair cabling. For improved noise immunity, CAN+ and CAN- must form a twisted pair with the shield connected to the connector backshell, as shown in Figure 16. A range of suitable CAN cables are available from Baldor, with catalog numbers beginning CBL004-5...

Baldor HMI	NextMove ST	NextMove ST	End node
Operator Panel	RJ45 connector	RJ45 connector

7

2

Twisted pair	Twisted pairs
	1
TR	2
0V	4
24V	5

1

2

4

5

TR

1

2

4

5

Figure 16 - Typical CAN network connections

MN1921 Input / Output 4-17