Fieldbus control with the embedded fieldbus 287
Fieldbus control with the
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 is connected to an external control system through embedded fieldbus. 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 (I/O terminals 23…26). The maximum length of the
communication cable with RS-232 is restricted to 3 meters.
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).
Note: The RS-232 connection is supported from software version 4.02A onwards.
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