Hart On Profibus; Commissioning; Figure 21: Operation Of Hart Devices Via Profibus - WAGO I/O-SYSTEM 750 Manual

WAGO-I/O-SYSTEM 750
750-484 2AI 4-20mA HART Ex i
8.3

HART on PROFIBUS

The PROFIBUS specification provides an open solution for incorporating HART
in PROFIBUS systems specifically. Here, the HART protocol is taken into
account in the specification as a PROFIBUS profile, which is also referred to as
"HART on PROFIBUS" for short.
This solution includes the use of the PROFIBUS communications mechanisms
without change to the PROFIBUS protocol and services, the PDUs or the state
machines and functional characteristics.
The HART client application is integrated within a PROFIBUS master and the
HART master within a PROFIBUS slave, the latter serving as a multiplexer and
handling the communication with the HART devices.

Figure 21: Operation of HART Devices via PROFIBUS

9

Commissioning

The principle of operation of the HART I/O module on the associated fieldbus
couplers and controllers is described in more detail in the following sub-sections
with regard to the various types of application and operating modes.
• Application type 1:
Operation with PLC library "WagoLibHART_0x.lib" when connected to any
75x-xxx fieldbus couplers/controllers listed in the "Compatibility List" table.
(Default operating mode 2 AI + 6-Byte Mailbox)
• Application type 2:
Operation with HART dynamic variables when connected to the PROFIBUS
DP/V1 Coupler 750-333 or Controller 750-833.
(Operating modes 2AI + 1, 2, 3, 4 HART variables per channel)
• Application type 3:
Operation with the 759-360 PROFIBUS/HART Gateway using FDT/DTM
when connected to the PROFIBUS DP/V1 Coupler 750-333 or Controller
750-833.
(Operating mode 2AI + acyclic PROFIBUS services)
Commissioning 65
Manual
Version 1.4.0