IFM Electronic AS-interface AC2620 Notice De Montage page 9

It is necessary to connect at least one Pt100 sensor before
switching on the AS-i slave to start the A/D converter, otherwise
the 1, 2, 3 und 6 flash at a frequency of about 5Hz.
When the Pt100 module (AC2620) is delivered a resistor is
placed between the terminals Ch2+ and Ch2-, Ch3+ and Ch3-
as well as Ch4+ and Ch4- so that no error message is indicated
by the module when it is operated with only one sensor being
connected.
The terminals Ch1+, Ch2+, Ch3+ and Ch4+ are connected to
each other in the module.
Parameter setting of the Pt100 modules
Parameter bit/
Designation
P0
filter
P1
periphery fault
P2
periphery fault
P3
selection
Pt100 elements
Description
1*
50Hz filter in the
A/D converter active
0 60Hz filter in the
A/D converter active
periphery fault
(see following chapter)
periphery fault
(see following chapter)
1
2-wire mode
3-wire mode
0
Comments
coding periphery fault
coding periphery fault
* default
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