220 JVL Industri Elektronik A/S - User Manual - Integrated Stepper Motors MIS23x, 34x, 43x
10.2 Connection and setup of the CAN bus
10.2.1 Connecting the MIS23x (SMC75) to the CAN bus
Before you connect the MIS23x (SMC75) to the CAN-bus, the Baud-rate, the Node-ID
and the termination 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.
:
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.
10.2.2 Necessary accessories for MIS23x (SMC75):
The EDS file for the MIS23x (SMC75) is available for download at JVL’s web-site, http://
www.jvl.dk, under the downloads menu, Field bus Interface Specifications Files. EDS
means Electronic Data Sheet. This file contains the information about MIS23x (SMC75)
settings that are required to configure the setup and program in the master. The MIS23x
(SMC75) 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 MIS23x (SMC75).
Bus Distance
(m)
Cross-sec-
tion (mm
2
)
Terminator
(Ohms)
Baud-rate
(Kbit/s)
25 0.25-0.34 120 1000
100 0.34-0.6 150-300 500
250 0.34-0.6 150-300 250
500 0.5-0.6 150-300 125
500 0.5-0.6 150-300 100
1000 0.75-0.8 150-300 50
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