Siemens SIMATIC ET 200iSP Operating Instructions Manual page 391

HART signal
The figure 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 filtered out
using an input filter so that the original analog signal is available again.
①
②
a
b
Figure 14-8
HART commands and parameters
With SIMATIC PDM you can set the parameters of the HART field 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-specific
Universal commands must be supported by all manufacturers of HART field devices and common
practice commands should be supported. There are also device-specific commands that apply
only to the particular field device.
ET 200iSP
Operating Instructions, 11/2022, A5E00247483-AK
Analog signal
Time in seconds
Command
Response
The HART signal
Analog electronic modules
14.10 Basics of HART
391