HES
User Manual
HART to Ethernet Gateway System
226-710-00A
September 2018
www.miinet.com
[11]
Moore Industries-International, Inc.
HES as a HART Master
The HES can be configured as a Primary or Secondary HART master and polls up to 16 field
devices on each of its four channels (total of 64 field devices maximum per HES). The HES
supports HART Commands 03 and 09 for the reading of Dynamic and Device Variables.
Additionally the HES supports HART Command 48 which reads the field device’s Additional
Status data. The HART revision of the field device will determine how it supports these
commands. Below is a brief summary of which HART Commands are supported by each HART
Revision.
HART 5 Devices support HART Command 03 only.
Using HART Command 03, the HES will read the Dynamic Variables, i.e. PV, SV, TV, QV and
loop current from the field device.
HART 6 Devices support HART Command 03 and Command 09.
Using HART Command 03, the HES will read the Dynamic Variables and loop current from the
field device. Using Command 09, the HES can read up to 4 four Device Variables from the field
device. To use Command 09, the number of Device Variables and each Device Variable Code
from the specific field device need to be specified.
HART 7 Devices support HART Command 03 and Command 09.
Using HART Command 03, the HES will read the Dynamic Variables and loop current from the
field device. Using Command 09, the HES can read up to eight Device Variables from the field
device. To use Command 09, the number of Device Variables and each Device Variable Code
from the specific field device need to be specified.
All HART revisions support the Additional Status Command 48.
For multivariable and more complex HART field devices, where data is required from more than
eight Device Variables, the field device can be polled multiple times by the HES with each poll
specifying up to eight unique Device Variables. For example, if you wanted Device Variables 2-
25 from a specific field device, you could configure the HES to poll that same field device using
HART Command 09 three times specifying eight unique Device Variables in each poll.
HES as a HART Field Device
The HES acts as both a HART Master (reading up to 64 field devices across four channels) and
as a HART Field Device. As a HART Field Device, it is HART 7 compliant and has both
Dynamic and Device Variables, which can be read via MODBUS/TCP, HART-IP or can be
viewed on the HES’ webpage. See figure 1.1
