Fig. 62 again shows the logic mapping of the input and output terminals of the inverter onto the status
and control word 2. Within the PLC the I/O-information on the common relation commands can be
programmed.
7.4
Positioning with IPOS via Fieldbus
The position specification via fieldbus requires that the inverter is equipped with the option FPI 31
and consequently the internal positioning control IPOS is activated!
This application example explains, how to transfer the position setpoints from the higher-level
automation device via fieldbus to the MOVITRAC
®
31.. and further how to be able to use the functions
of the internal positioning control IPOS via fieldbus.
For a detailed description of the internal positioning control IPOS please refer to the documentation
MOVITRAC
®
31.. FPI 31 Positioning Control IPOS. This description is not part of this example.
7.4.1
Objective
The inverter MOVITRAC
®
31.. is to receive different position setpoints via the fieldbus system and
execute the positioning process independently. The complete control is to be carried out by the
fieldbus master. Further the current actual value of the position as well as the status of the inverter
must be returned to the higher-level master.
The inverter is to be controlled exclusively by the control word 2. Only the limit switches CW/CCW
are connected to the unit. A corresponding IPOS-automatic program is to be programmed for the
processing of the setpoint position.
In the case of a bus fault the drive must execute a rapid stop after 100 ms.
72 71 70 69 64 63 62 61
-
54 53 52 51 50
41 42 43 47 48 49
61 62
7
6
5
4
3
2
1
0
7
6
5
4
3
2
1
0
MOVITRAC
31
®
Input byte IB 32
Output byte OB 32
: U I 32.6 input terminal 42
: U I 32.5 input terminal 43
: U I 32.4 input terminal 47
: U I 32.3 input terminal 48
: U I 32.2 input terminal 49
: = O 32.0 = output terminal 62
Fieldbus
PLC
Physical outputs
Status word 2
Virtual output terminals
Control word 2
Virtual input terminals
Physical inputs
00958AEN
Fig. 62: Mapping of the I/O-information on the fieldbus and in the PLC
7
Application Examples
MOVITRAC
®
31.. Fieldbus Unit Profile
71
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