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8 Analog Input Modules
Analog input modules (AI) detect standard electrical signals at the connections of the base modules,
digitalize them and transmit the corresponding measurement values to the gateway via the internal
module bus.
The module bus electronics of the analog input modules are galvanically isolated from the field
level via an optocoupler. The module provides reverse polarity protection.
Supported signal ranges
0…20 mA
4…20 mA
0…10 VDC
-10…+10 VDC
HART
Connectable sensors
Platinum sensors (Pt100, Pt200, Pt500, Pt1000)
Nickel sensors (Ni100, Ni1000 (DIN 43 760), Ni1000TK5000)
Thermo elements (types: B, E, J, K, N, R, S, T)
Resistances (0…250 , 0…400 , 0…800 0…2000 , 0…4000 )
LED status indicators
Error signals from the I/O level are indicated by each module via the ”DIA” LED. The corresponding
diagnostic information is transmitted to the gateway via diagnostic bits.
A continuously lit up red ”DIA” LED indicates the failure of the module bus communication at the
analog input module.
8.0.1 Shield
When using shielded signal cables, the connection between the shield and the base module is
made via a two-pole shield connection, which is available as an accessory.
8.0.2 Analog data representation
The analog values can either be represented with16 bit or 12 bit. The two's-complement represen-
tation allow the representation of positive as well as negative values.
NOTE
For some analog modules (e.g. BL20-E-8AI-U/I-4PT/NI or BL20-2AIH-I) with extended value
representation functions, the tables for the measurement values can be found within the
respective module descriptions.
NOTE
A detailed description of the 16 bit/12-bit-representation for the analog values can be
found in the Appendix of this manual.
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