Hart Signal; Hart Device Status - Siemens SIMATIC ET 200SP HA Equipment Manual

7.2.3

HART signal

Definition
A HART signal consists of sine waves of 1200 Hz and 2200 Hz and has an average value of 0.
Description
The following figure shows the analog signal with the modulated HART signal (FSK method). It
can be filtered out using an input filter so that the original analog signal is available again.
①
②
K
A
7.2.4

HART device status

Definition
The two HART status bytes (HART device status) that are transferred with each response of the
field 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.
AI 4xI 2-/4-wire HART ISOL HA
Equipment Manual, 07/2022, A5E50101523-AB
Analog signal
Time (seconds)
Command
Response
HART function
7.2 HART system connection
41