Field Bus Interface; Data Layout - Danfoss VLT 5000 Operating Instructions Manual

Field bus interface

NOTE: This section is only relevant if the VLT is equipped with a Field bus interface (option) as well as
the Positioning controller.
The Positioning controller can be controlled via the digital/analogue inputs or via field bus. The control
source can be selected in parameter 749. There can only be one control source at a time meaning that
the digital/analogue inputs are inactive when Field bus is selected as control source and visa versa. The
only exceptions are listed in the digital interface section.
In field bus mode it is possible to specify only the target position and velocity. If the acceleration and
deceleration PCDs are left blank then the last used acceleration and deceleration chosen via an index is
used. This enables the use of PPO type 4

Data layout

Control and status signals are transferred via the so-called process data channel (PCD) of the various
field bus interfaces. The telegram structure and the available number of data words depends on the
Field bus used, please refer to the manual of the Field bus option in use for further details. The below
example is based on the layout of a PROFIBUS telegram, the so-called PPO:
Example using PROFIBUS PPO type 5:
Field bus control signals:
Field bus
[word.bit]
1.1
1.2
Go to home / Stop positioning (↑) / Go to position (↓)
1.3
1.4
1.5
1.6
1.7
1.8
1.9
1.10
MG.50.P3.02 - VLT is a registered Danfoss trademark
Positioning Controller
Field bus mode
Quick bus go to target(↑)
Reset error (↑)
Read new trajectory index (↑)
Automatic (↑) / manual (↓) mode
Reset home status (↑)
Reset touch probe position (↑)
Quick stop (↓)
Positive jog (↑)
Negative jog (↑)
Corresponding input
N\A
27
32
33
5
6
7
8
53
54
17