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1718 Ex I/O HART Analog I/O Modules
Chapter 4
The 1718 EX I/O HART analog I/O modules act as a primary HART master.
They support the use of a secondary HART master such as a handheld
communicator.
Integrated HART Networks
Most 4...20 mA transmitters are available with a HART protocol interface. The
type of data available depends on the type of instrument.
An example application is a HART enabled mass flowmeter. The standard mA
signal from the flowmeter provides one primary measurement - flow. The mA
signal with HART provides more process information. The mA signal that
represents flow is still available. The HART configuration of the flowmeter can
be set to communicate primary value (PV), secondary value (SV), third value
(TV), and fourth value (FV). These values can represent, for example, mass flow,
static pressure, temperature, total flow, etc.
Device status information is also provided via HART. Instead of one process
variable, with HART the controller sees four process variables, has a check on the
mA signal, and has a reading of device status. HART connectivity provides all
this information with no changes to the existing 4...20 mA wiring.
FDT/DTM technology via HART connectivity also provides remote
configuration and troubleshooting of field devices by using software such as
Endress+Hauser FieldCare software.
HART-enabled I/O Modules
The 1718 Ex I/O HART analog I/O modules have built-in HART modems, so
there is no need to install external HART multiplexers or clip-on HART
modems. The 1718-IF4HB and 1718-CF4H modules have a separate HART
modem for each channel.
You can use the HART analog I/O modules with asset management software,
Asset Management Software
such as Endress+Hauser FieldCare software.
Rockwell Automation Publication 1718-UM001A-EN-E - June 2020
41
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