Manual – DFP21B PROFIBUSDP-V1 Fieldbus Interface
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Features
Introduction
3.3.2 Access to all information
MOVIDRIVE
®
MDX61B offers digital access to all drive parameters and functions via
the PROFIBUS interface. The drive inverter is controlled via fast, cyclic process data.
Via this process data channel, you can enter setpoints such as the setpoint speed, ramp
generator time for acceleration/deceleration, etc. as well as trigger various drive
functions such as enable, control inhibit, normal stop, rapid stop, etc. However, at the
same time you can also use this channel to read back actual values from the drive
inverter, such as the actual speed, current, unit status, fault number and reference
signals.
3.3.3 Cyclical and acyclical data exchange via PROFIBUS DP
While process data exchange usually takes place cyclically, drive parameters can be
read and written acyclically via functions such as READ or WRITE or via the
MOVILINK
®
parameter channel. This parameter data exchange enables you to
implement applications in which all the important drive parameters are stored in the
master programmable controller, so that there is no need to make parameter settings
manually on the drive inverter itself.
3.3.4 Acyclical data exchange via PROFIBUS DP-V1
The PROFIBUS DP-V1 specification introduced new acyclical READ/WRITE services
as part of the PROFIBUSDP expansions. These acyclical services are added to the cur-
rent cyclical bus operation in special telegrams to ensure compatibility of PROFIBUS DP
and PROFIBUS DP V1.
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