Siemens Simatic S7-1500 / ET 200MP - Page 78

System overview
4.6 Input and output modules
Automation system
System Manual, 01/2023, A5E03461182-AK
77
Short designation AI 8xU/I HF
AI 8xU/I HS
AI 8xU/R/RTD/TC HF
AI 8xU/I/RTD/TC ST
AI 4xU/I/RTD/TC ST
AI 8xU/I/R/RTD BA
AI 4xU/I/RTD/TC / AQ
2xU/I ST
Measuring range adap-
tation
Only with HF
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Scale measured values
Only with HF
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Scale temperatures
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Only with HF
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Benefits
Analog input modules detect process signals, e.g. pressure or temperature and pass the
process signals on in digitalized form (16 bit format) to the CPU. You use the analog input
modules to measure current (2-wire and 4-wire transducer), voltages, resistances (resistance
thermometer) and temperatures (thermoelements). The measurement types depend on the
module used.
The analog input modules provide you with the following advantages:
• Front connector in screw-type connection system or in push-in system (35 mm width) or
push-in system for 25 mm modules
• Same mechanical design, same handling and same accessories for all modules
• Components required for shielding are included in the scope of delivery and allow simple
and quick installation without the use of tools
• Same pin assignment for wiring, which means that circuit diagrams and wiring plans can
be universally used
• Any combination of narrow and wide modules
• Can be used centrally in SIMATIC S7-1500 and in ET 200MP distributed I/O system
Overview of functions
In the following you will find a brief overview of special functions of the modules. You can
find a detailed description of the functions in the equipment manual of the module.
Measuring range adjustment of the analog input module AI 8xU/I HF
The function adjusts the measuring range to the sensor. You can increase the resolution for a
configurable part of the measuring range in S7 format. The measured signal is resolved
precisely to more decimal places around a specific operating point.
Scaling of the measured values of the analog input module AI 8xU/I HF
With measured value scaling, you display the user data of the module in REAL format (32-bit
floating point) instead of S7 format. You can thus directly assign a technological variable to
the analog value of the module. The conversion is made directly in the module, which saves
power and cycle time in the CPU.
You can combine the measured value scaling with the measuring range adjustment. In this
case, the measuring range is adjusted first and then the representation of the measured value
is scaled.