Danfoss VLT PROFIBUS DP MCA 101 User Manual

4 Control
4.1 PPO Types
The PROFIBUS prole for frequency converters species a
number of communication objects (parameter process data
objects, PPO). The PROFIBUS prole for frequency
converters is suitable for data exchange between a process
controller (for example PLC) and a frequency converter. All
PPOs are dened for cyclic data transfer (DP-V0) for
transferring process data (PCD) and parameters (PCA) from
the master to the slave, and conversely.
Pure process data objects
PPO types 3, 4, 6, 7, and 8 are pure process data objects
for applications requiring no cyclic parameter access. The
PLC sends out process control data, and the frequency
converter then responds with a PPO of the same length,
containing process status data.
Illustration 4.1 shows the available PPO types:
•
PCD 1: The
rst 2 bytes of the process data area
(PCD 1) comprise a xed part present in all PPO
types.
•
PCD 2: The next 2 bytes are
xed for PCD write
entries (see parameter 9-15 PCD Write Congu-
ration [1]), but congurable for PCD read entries
(see parameter 9-16 PCD Read Conguration [1]).
•
PCD 3–10: In the remaining bytes, the process
data can be parameterized with process signals,
see parameter 9-23 Parameters for Signals.
The setting in parameter 9-15 PCD Write Conguration
determines the signals for transmission (request) from the
master to the frequency converter.
The setting in parameter 9-16 PCD Read Conguration
determines the signals for transmission (response) from the
frequency converter to the master.
Parameter channel and process data
PPO types 1, 2, and 5 consist of a parameter channel and
process data. Use the parameter channel for reading
and/or updating of parameters (successively). Alternatively,
for better utilization of I/O and PLC capacity, access
parameters via DP-V1. To access via DP-V1, select a pure
process data object (PPO type 3, 4, 6, 7, or 8).
Select the PPO type in the master conguration. The
selection is automatically recorded in the frequency
converter. No manual setting of PPO types in the
frequency converter is required. Read the current PPO type
in parameter 9-22 Telegram Selection. The setting [1]
Standard telegram 1 is equivalent to PPO type 3.
In addition, all PPO types can be set up as word-consistent
or module-consistent. The process data area can be word-
or module-consistent, whereas the parameter channel
must always be module-consistent.
•
Word-consistent data is transmitted as individual,
independent words between the PLC and the
frequency converter.
•
Module-consistent data is transmitted as sets of
interrelated words transferred simultaneously
between the PLC and the frequency converter.
Control Programming Guide
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Danfoss VLT PROFIBUS DP MCA 101 Specifications

General

Brand	Danfoss
Model	VLT PROFIBUS DP MCA 101
Category	Media Converter
Language	English