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Overview of Functions
Thanks to its high-performance, universal fieldbus interface, the MOVITRAC
®
31.. inverter enables
connections to be made with higher-level automation systems via a wide range of fieldbuses, such
as INTERBUS-S, PROFIBUS-DP, PROFIBUS-FMS, etc. The underlying behaviour of the inverter,
known as the unit profile, is independent of the fieldbus and is thus uniform.
MOVITRAC
®
31.. offers digifunctions via the fieldbus interface. The inverter is controlled by the
high-speed cyclic process data. This process data channel provides the facility to specify setpoints
such as setpoint speeds, ramp generator times for acceleration and deceleration etc., as well as
various drive functions such as enable, controller inhibit, stop, rapid stop, etc. to be triggered. This
channel can also be used to read back actual values from the inverter, such as actual speed, current,
unit status, error number or reference messages.
Whereas process data are generally exchanged in cycles, the drive parameters can also be read and
written acyclically via functions such as READ and WRITE. This exchange of parameter data enables
applications where all major drive parameters are stored in the higher-level automation unit to be
implemented, thus avoiding manual adjustment of parameters on the inverter itself, which can often
be very time-consuming.
The fieldbus option pcbs are designed so that all settings specific to the fieldbus, such as the fieldbus
address, can be made on the option pcb by means of a hardware switch. These manual settings
enable the inverter to be integrated into the fieldbus and switched on in a very short space of time.
Parameters can be set fully automatically by the higher-level fieldbus master (parameter download).
This forward-looking version offers the benefits of a shorter commissioning period for the plant as
well as simpler documentation of the application program, as all major drive parameter data are now
recorded directly in the control program.
The use of a fieldbus system in drive technology requires additional monitoring functions, such as
fieldbus timeout or special emergency stop concepts. The monitoring functions of the MOVITRAC
®
31.. can be matched to the specific application for which it is to be used. This feature enables you,
for instance, to specify which error response the inverter should trigger if an error should occur in
Introduction
1
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TRAC
®
841
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RUN
BUS
FAULT
M
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TRAC
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841
E
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RUN
BUS
FAULT
M
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TRAC
®
841
E
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RUN
BUS
FAULT
M
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TRAC
®
841
E
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RUN
BUS
FAULT
Fieldbus
CONTROL MODE
Fieldbus
CONTROL MODE
Fieldbus
CONTROL MODE
Fieldbus
CONTROL MODE
Frequency inverter
Visualization
Analogue I/O
Digital I/O
Controller
00311AEN
Fig. 1: Typical bus configuration in a field environment
MOVITRAC
®
31.. Fieldbus Unit Profile
7
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