Fieldbus Control With Embedded Fieldbus; What This Chapter Contains; System Overview - ABB ACS355 User Manual

Fieldbus control with embedded fieldbus 301

Fieldbus control with
embedded fieldbus

What this chapter contains

The chapter describes how the drive can be controlled by external devices over a
communication network using embedded fieldbus.

System overview

The drive can be connected to an external control system through a fieldbus adapter
or embedded fieldbus. For fieldbus adapter control, see chapter Fieldbus control with
fieldbus adapter on page 325.
The embedded fieldbus supports Modbus RTU protocol. Modbus is a serial,
asynchronous protocol. Transaction is half-duplex.
The embedded fieldbus can be connected with either RS-232 (control panel
connector X2) or EIA-485 (terminal X1 of the optional FMBA-01 Modbus adapter
connected to drive terminal X3). The maximum length of the communication cable
with RS-232 is restricted to 3 meters. For more information on the FMBA-01 Modbus
adapter module, see FMBA-01 Modbus adapter module user's manual
(3AFE68586704 [English]).
RS-232 is designed for a point-to-point application (a single master controlling one
slave). EIA-485 is designed for a multipoint application (a single master controlling
one or more slaves).