11.2 Connection And Setup Of The Can Bus - JVL MIS17 Series User Manual

11.2 Connection and setup of the CAN bus

11.2.1 Connecting the motor to the CAN bus
Before you connect the motor to the CAN-bus, the Baud-rate, the Node-ID and the ter-
mination must be selected.
On the serial bus it is possible to set a transmission speed (Baud-rate) of max.1000 Kbit/
s and a min. of 10 Kbit/s. The Baud-rate depends on the cable length, and the wire cross-
section. The table below gives some recommendations for networks with less than 64
nodes. Recommended bus cable cross-sections are according to CIA.
:
Bus Distance
(m)
25
100
250
500
500
1000
The bus wires may be routed in parallel, twisted and/or shielded, depending on EMC re-
quirements. The layout of the wiring should be as close as possible to a single line struc-
ture in order to minimize reflections. The cable stubs for connection of the bus node
must be as short as possible, especially at high bit rates. The cable shielding in the housing
must have a large contact area. For a drop cable, a wire cross-section of 0.25 to 0.34
mm² would be an appropriate choice in many cases.
For bus lengths greater than 1 km, a bridge or repeater device is recommended. Galvanic
isolation between the bus nodes is optional.
11.2.2 Necessary accessories:
The EDS file for the MIS motors is available for download at JVL's web-site,
www.jvl.dk, under the downloads menu, Field bus Interface Specifications Files. EDS
means Electronic Data Sheet. This file contains the information about the motor settings
that are required to configure the setup and program in the master. The MIS motor is a
slave module on the CAN-bus. The master can, for example, be a PLC or a PC.
If you are using a PLC as master, then make sure it is provided with a CANopen commu-
nications module, and that the correct programming tools are available. For support of
the PLC master, the PLC vendor is recommended.
If you are using a PC as master, JVL provides some tools that can help when installing and
using the MIS motors.
272 JVL Industri Elektronik A/S - User Manual - Integrated Stepper Motors MIS17x, 23x, 34x, 43x
Cross-sec- Terminator
tion (mm ) (Ohms)
2
0.25-0.34
0.34-0.6 150-300
0.34-0.6 150-300
0.5-0.6 150-300
0.5-0.6 150-300
0.75-0.8 150-300
Baud-rate
(Kbit/s)
120 1000
500
250
125
100
50
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