Analog Input Modules
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8.8 Analog input module, 8AI voltage/current and 4 Pt/Ni, Economy
The analog input module is used to connect 8 analog signals. Each channel can be parameterized
in different current or respectively voltage ranges. Additionally, 2 analog channels at a time can be
combined to a Pt-/Ni- or R-input with 2- or 3-wire technology (see Connection options, s. p. 153).
The module thus provides a maximum number of 8 measurement inputs for voltage or current or 4
channels for 2- or 3-wire Pt-/Ni- or resistance-measurement. The function setting is done via chan-
nel-oriented parameters.
The module provides galvanic isolation between the field and the module bus connection.
The supply for the signals has to be connected externally. A shield connection to the base module
is not possible.
Fig. 146: BL20-E-8AI-U/I-4PT/NI
Fig. 147: Block Diagram
logic
24 module supplyV DC 5 module busV DC
galvanic isolation
A/D converter
+ multiplexer
Reference
24 V DC
GND
CPU
field
...
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