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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 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-RES-01 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-RES-01 ex-

pansion module.

4.1 Bus termination

The necessary bus terminator at the physically first and last subscriber can alternativel

be activated via the two DIP switches S1 and S2 on the EM-RES-01 expansion mod-

ule.

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

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

shape of the CAN signals, which results in an improvement of the signal shapes, in

particular in extended systems.

Note: Switch S3 is used to confi

ure the analo

input (see chapter "Analo

inpu

EM-S1INA“).

X410A

410B

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

An active termination may only be switched once on a bus system via S1

and S2. The other bus termination has to be done in passive mode.

CAN high (X410B.6)

120

CAN low (X410B.5)

Data line

CAN high (X410B.6)

332

CAN low (X410B.5)

Data line

passive active

332

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BONFIGLIOLI EM-RES-02 Instruções de Operação Página 12