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8.2
HART system connection
8.2.1
Notes on 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
up of data records that are transferred internally between the IM and I/O module via the
ET 200SP HA IO device. The data records must be created and interpreted by the client.
• HART signal (Page 81)
• HART configuration tool (Page 80)
• HART device status (Page 81)
F-AI 8xI 2-/4-wire HART HA
Equipment Manual, 09/2021, A5E50557845-AA
HART function
8.2 HART system connection
79
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