System Bus Interface; Bus Termination - BONFIGLIOLI actice Instruction Manual

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The CAN connection of the system bus is physically designed according to ISO-DIS
11898 (CAN High Speed). The bus topology is the line structure.
In the default version, the frequency inverter support a CAN protocol controller, which
may exist in either the CM-CAN communication module with CANopen interface OR in
an expansion module for the system bus, such as the EM-ENC-03 expansion module.
Attention! Installation of two optional components with CAN-Protocol controller re-
4.1
The necessary bus terminator at the physically first and last node can alternatively be
activated via the two DIP switches S1 and S2 on the EM-ENC-03 expansion module.
•
•
Note:
Attention! The factory setting for the bus termination is OFF.
06/05
06/05

System bus interface

sults in a deactivation of the system bus interface in the EM-ENC-03 ex-
pansion module!

Bus termination

Either set S1 to ON and S2 to OFF for a regular passive termination.
or set S1 and S2 to ON for an active termination. This results in an improved edge
shape of the CAN signals, which causes improvement of the signal shapes, in par-
ticular in extended systems.
Switch S3 is used to configure a termination resistor of 150 Ω for the
speed sensor input EM-ENC (see chapter „Speed Sensor input EM-ENC").
S3
The active termination via the DIP switches S2 and S2 may only be acti-
vated in one expansion module. The other bus termination must be pas-
sive.
Data line
CAN high (X410B.6)
120 Ω
Data line
CAN low (X410B.5)
passive
X410A
X410B
Data line
Data line
S1
S2
332 Ω
CAN high (X410B.6)
CAN low (X410B.5)
332 Ω
active
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