Analog Electronics Modules with HART
ET 200iS Distributed I/O Station
15-2
A5E00087831-02
15.1.2
How Does HART Work?
Introduction
The HART protocol describes the physical form of the transfer:
Transmission procedures, message structure, data formats and commands.
HART Signal
The following schematic shows the analog signal with the HART signal
superimposed on it (FSK technique). The signal is composed of sine waves of
1200 Hz and 2200 Hz having an average value of zero. It can be filtered out using
an input filter so that the original analog signal is available again.
+0.5 mA
0
-0.5 mA
1200 Hz
"1"
2200 Hz
"0"
Analog signal
4 mA
20 mA
Time (seconds)
R=response
C
R
C
R
C
R
C=command
0
Figure 15-1 The HART Signal
Содержание SIMATIC ET 200iS
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Страница 357: ...Certifications ET 200iS Distributed I O Station A5E00087831 02 20 27 20 2 7 2AI I 4WIRE 2AI I 4WIRE HART 20 2 8 2AI RTD ...
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Страница 366: ...Marking ET 200iS Distributed I O Station 21 8 A5E00087831 02 ...
Страница 390: ...12 Product Information to the manual Distributed I O device ET 200iS Version 10 2001 A5E00163808 02 ...
Страница 416: ...26 Product Information RS 485 IS Coupler 6ES7 972 0AC80 0XA0 A5E00207628 01 ...
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Страница 419: ...28 Produktinformation RS 485 IS Koppler 6ES7 972 0AC80 0XA0 A5E00207082 01 ...
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