HART signal
The gure below shows the analog signal with the modulated HART signal (FSK method), which
consists of sine waves of 1200 Hz and 2200 Hz and has a mean value of 0. It can be ltered out
using an input lter so that the original analog signal is available again.
N"
`N"
C
B
C
B
C
B
C
B
N"
N"
)[
)[
① Analog signal
② Time in seconds
a Command
b Response
Figure 14-8 The HART signal
HART commands and parameters
With SIMATIC PDM you can set the parameters of the HART eld devices via HART commands
and read them out via HART responses. The HART commands and their parameters are divided
into three groups with the following properties:
• Universal
• Common practice
• Device-specic
Universal commands must be supported by all manufacturers of HART eld devices and common
practice commands should be supported. There are also device-specic commands that apply
only to the particular eld device.
Analog electronic modules
14.10 Basics of HART
ET 200iSP
Operating Instructions, 11/2022, A5E00247483-AK 391
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