Hart System Connection; Useful Information About System Connection - Siemens SIMATIC ET 200SP HA Equipment Manual

HART responses always contain data. Status information (HART device status; 1st and 2nd status
bytes) is always sent together with a HART response. status bytes) is always sent together with
a HART response. You should evaluate these to make sure the response is correct.
7.2

HART system connection

7.2.1

Useful information about system connection

The following describes the system connection and configuration of the field devices.
System environment
To use an intelligent field device with HART functionality, you require the following system
environment:
• 4 to 20 mA current loop
• Connecting field devices to the I/O module
The system connection is shown as follows:
The I/O module is used in an IO device based on ET 200SP HA. You can connect a HART field
device to each channel (monodrop operation). The I/O module operates as a HART master and
the field devices as HART slaves.
The I/O module receives the commands, e.g. from the HART configuration tool, forwards them
to the intelligent field device and returns the responses. The interface of the I/O module is made
AI 4xI 2-/4-wire HART ISOL HA
Equipment Manual, 07/2022, A5E50101523-AB
HART function
7.2 HART system connection
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