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I/O

Measuring analog signals

Application Note DK9222-0112-0059

Keywords

Loop-powered

2-wire transmitter

True Zero

4-20 mA

KL3458

Analog

Single-ended

Current loop

Loop power

Live Zero

KL3454

KL3054

Difference

Input

Analog signal transmission: Current interface 4…20 mA

(Live Zero principle)

This application example describes the facets of analog signal recording and their forms of transmission in

general. In particular, this document covers the recording of measured values using the KL3054, KL3454 and

KL3458 analog input Bus Terminals from Beckhoff. When used in conjunction with 2 or 3-wire sensors, these

terminals enable the detection of cable breakage and sensor failures internally in the circuit according to

the Live Zero principle.

Analog signal recording

Analog measured variables such as pressure, temperature, ﬂow, speed, etc. are converted by sensors into analog values and,

depending on the sensor, are also linearized inside the sensor. Sensors for analog measured variables usually consist of two

functional elements – the measuring sensor and the transducer – and determine the change in the measured variable by

means of a physical principle. The digitized analog signal transmitted to the controller normally corresponds to a standardized

level and is always composed of the type (voltage, current, resistance, etc.) and the value (0 – 10 V, ± 1 V, 0 – 20 mA, 500 mΩ,

etc.)

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For application notes see disclaimer on the last page

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Résumé du contenu

Page 1 - (Live Zero principle)

I/OMeasuring analog signalsApplication Note DK9222-0112-0059KeywordsLoop-powered2-wire transmitterTrue Zero4-20 mAKL3458AnalogSingle-endedCurrent loop

Page 2

I/OMeasuring analog signalsApplication Note DK9222-0112-0059 ProcessSensorPhysical quantityDigital variableProcess data formatMeasured valueAnalog val

Page 3 - Types of analog signals

I/OMeasuring analog signalsApplication Note DK9222-0112-0059development. Voltage or current-based methods of transmission are mainly used (table 1). I

Page 4

I/OMeasuring analog signalsApplication Note DK9222-0112-0059Live Zero (1/2…10 V | 4…20 mA)Since a ﬁnite value (value > 0) of the lower measuring ra

Page 5

I/OMeasuring analog signalsApplication Note DK9222-0112-0059 Bus Terminals for Live Zero signals 4…20 mAIntegrated voltage supplyNumber of channelsRes

Page 6

I/OMeasuring analog signalsApplication Note DK9222-0112-0059KL3458 8-channel analog input Bus Terminal The KL3458 unites eight inputs in a single hous

Page 7

I/OMeasuring analog signalsApplication Note DK9222-0112-0059 Correct multiple tapping of a current-based measured valueA=KL3022 differential inputKL3

Page 8 - Measuring analog signals

I/OMeasuring analog signalsApplication Note DK9222-0112-0059This publication contains statements about the suitability of our products for certain are

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