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).
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