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AS-Interface Analyser Functions of the Analyser
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5.6.2 Analog I/O Data
The data of the existing analog slaves in the net which are working according to
the slave profiles S-7.3.x are indicated here. For digital slaves the display remains
empty (Fig. 9).
The details of communication and the kind and number of the channels but not the
physical meaning of the values are fixed in the profile. It is specified by the manu-
facturer in such a way that different slaves are realizable. The user of the analyser
must convert, however, the received values according to the calibration curve of
the equipment. If a slave indicates an overflow through its "overflow bit" this is re-
presented by an additional point in the appropriate channel.
Fig 9: In the example the slaves with address 8 und 10 are analog slaves are a 2-channel
input slave (address 8) and a 2-channel output slave (address 10).
Example : In fig. 9 an analog input module (slave 8) and an analog output module
(slave 10) with two channels each are attached. In both cases the va-
lue "0" corresponds to 0 V, the value 10.000 to a voltage of 10 V. The
modules have a resolution of 1 mV. The displayed values results:
Input module Sl. 8: Channel 0 8,821 V
Channel 1 0 V
Output module Sl. 10: Channel 0 7,121 V
Channel 1 -0,051 V
The analyser must convert the captured data telegrams according to
the profile of the slaves; therefore it is a requirement for this indica-
tion that the analyser knows the profile of each individual attached
device. He must have observed at least one time the start of the
slave communication. Only in this way the four configuration data
can be captured and displayed in the representation.