Siemens SIMATIC ET 200SP HA - HART Signal; HART Device Status

7.2.3 HART signal
De󹪝nition
A HART signal consists of sine waves of 1200 Hz and 2200 Hz and has an average value of 0.
Description
The following 󹪝gure shows the analog signal with the modulated HART signal (FSK method). It
can be 󹪝ltered out using an input 󹪝lter so that the original analog signal is available again.
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P$
$
.
$
.
$
.
$
.
P$
P$
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① Analog signal
② Time (seconds)
K Command
A Response
7.2.4 HART device status
De󹪝nition
The two HART status bytes (HART device status) that are transferred with each response of the
󹪝eld device contain error information about the HART communication, HART command and
device status.
Among other things, this information is evaluated by the I/O module and signaled to the CPU via
maintenance messages.
HART function
7.2 HART system connection
AI 4xI 2-/4-wire HART ISOL HA
Equipment Manual, 07/2022, A5E50101523-AB 41