3.8.2
Principle method of functioning
The I/O-module functionality is only available in the operating modes U/f-control or speed control
(P770 operating mode = U/f-control or speed control), as the output terminal assignment
IPOS-OUTPUT 1...8 is used. Thereby the first eight input terminals are assigned to the output terminal
assignments IPOS-OUTPUT 1...8 according to the following table:
Input terminal
Assignemt via output terminal assignment
Available basic unit / with FEN/FPI
41
IPOS-output 1
physical
42
IPOS-output 2
physical
43
IPOS-output 3
physical
47
IPOS-output 4
physical
48
IPOS-output 5
physical/virtual in control word 2
49
IPOS-output 6
physical/virtual in control word 2
50
IPOS-output 7
virtual in control word 2
51
IPOS-output 8
virtual in control word 2
When activating the internal positioning control IPOS (P770 operating mode = positioning control)
the I/O-module functionality must be simulated with the IPOS program.
The reflection of the physical input and output terminals onto the fieldbus takes place via the virtual
input terminals of the control word 2 and the virtual output terminals of the status word 2.
In order to make the inverter ignore the input terminals used for the I/O-module functionality for drive
control these terminals must be programmed to NO FUNCTION. The connection to the fieldbus is
made by programming the output terminals to the function IPOS-OUTPUT 1...8.
Reading in Physical Inputs
In order to be able to read in the physical input terminal 42, for example, via fieldbus this terminal is
programmed onto a virtual output terminal (e.g. P617 terminal 72 = IPOS-OUTPUT 2). This way the
logic level of the input terminal 42 is available to the higher-level control via the virtual output terminal
72 of the status word 2. In order to avoid the drive functionality being affected by the level of the
input terminal 42 the assigned terminal function is programmed to NO FUNCTION.
Inverter Control
with Process Data
3
40
MOVITRAC
®
31.. Fieldbus Unit Profile
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