II - DCE FEL ČVUT v Praze

3.8 Analog Input Module SM 331; AI 4 x 0/4...20 mA
In this chapter
Order number
Features
Resolution
I/O Modules with Intrinsically-Safe Signals
C79000-G7076-C152-04
In this chapter you will find the characteristics and the technical
specifications for the analog input module SM 331; AI 4 x 0/4...20 mA, and
you will learn
how to place the analog input module into operation.
what parameters influence the characteristics of the analog input module.
what diagnostic options the analog input module offers.
6ES7 331-7RD00-0AB0
SIMATIC S7 Ex Analog Modules
The analog input module SM 331; AI 4 x 0/4...20 mA is characterized by the
following features:
4 inputs in 4 channel groups
Measured value resolution; adjustable per channel (dependent on the
integration time set)
– 10 Bit (integration time 2.5 ms)
– 13 Bit (integration time 162 /3 / 20 ms)
– 15 Bit (integration time 100 ms)
measurement mode selectable per channel:
– Current
– Channel deactivated
Arbitrary measuring range selection per channel
– 0 ... 20 mA
– 4 ... 20 mA
Configurable diagnostics and configurable diagnostic interrupt
Channel 0 and 2 with limit value monitoring and configurable limit interrupt
Channels isolated among each other and with respect to CPU and load
voltage L+
The analog inputs are HART compatible
The resolution of a measured value depends directly on the selected
integration time, i.e. the longer the integration time for an analog input
channel, the more accurate the resolution of the measured value (refer to
technical specifications for the analog input module and Table 3-2).
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