IFM Electronic AS-interface AC2220 Notice De Montage page 11

In detail:
A 4-wire measurement always has to be preferred over a 2-wire mea-
surement.
In 2-wire measurement all transition and connection resistances add
up and may massively falsify the measurement result.
Therefore a 2-wire measurement is not recommended!
Parameter setting of the analogue modules
Parameter bit/
Designation
P0
filter
P1, P2
periphery fault
P3
selection
Pt100 elements
Activation of the periphery fault message of the channels 1 to 4
According to the table above the parameter bits P1 and P2 are used to
define which measuring channels can trigger a periphery fault message.
But irrespective of the defined parameters all 4 channels are always
transferred via the AS-Interface.
Description
1
50Hz filter in the
A/D converter active
0 60Hz filter in the
A/D converter active
Parameter bit
P1 P2
0 0
0 1
1 0
1 1
1
2-wire mode
0
4-wire mode
Comments
The 50Hz filter applies
to the whole of Europe
Periphery fault can be triggered by
1 2
on off
on on
on on
on on
3 4
off off
off off
on off
on on
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