BONFIGLIOLI act 401 Operations Instructions download pdf (Page 13)

12 06/05

4 System bus interface

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 supports 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-IO-02 expansion module.

Attention! Installation of two optional components with CAN-Protocol controller re-

sults in a deactivation of the system bus interface in the EM-IO-02 ex-

pansion module.

4.1 Bus termination

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-IO-02 expansion module.

• Either set S1 to ON and S2 to OFF for a regular passive termination,

• or switch S1 and S2 to ON for an active termination. This results in an improved

edge shape of the CAN signals, which improves the signal shapes, in particular in

extended systems.

Note: Switch S3 is used to confi

ure the analo

input (see chapter "Analo

input

EM-S1INA“).

X410A

X410B

Attention! The factory setting for the bus termination is OFF.

The active termination via the DIP switches S1 and S2 may only be acti-

vated in one expansion module. The other bus termination must be pas-

sive.

CAN high (X410B.6)

120 Ω

CAN low (X410B.5)

Data line

CAN high (X410B.6)

332 Ω

CAN low (X410B.5)

Data line

passive active

332

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BONFIGLIOLI act 401 Operations Instructions Page 13