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The CANopen bus coupler is designed to connect a CAN bus to
TB two-zero peripheral modules. It supports the CANopen protocol as
defined in DS three zero one and uses the DSP four zero one profile for digital and
analog I/O modules. Up to sixty four modules of any kind can be
connected in series with the bus coupler. This coupler makes it
possible to use SDOs to freely access all I/O values, parameters,
and diagnostics, and can manage up to one nine two bytes of I/O data
with the PDO protocol.

A functioning TB two-zero configuration will always require a bus
coupler and at least one peripheral module. The bus coupler
supports hot-swapping for replacing modules during ope ratio