ProSoftOil and Gas Application Solutions www.prosoft-technology.com

Using Field Instrumentation 

Why HART?

For many years the fi eld communication standard for process automation 

equipment has been a milliamp (mA) analog current signal with a signal 

range of 4-20mA. The HART (Highway Addressable Remote Transducer) 

protocol extends this 4-20mA standard to enhance communication with 

smart fi eld instruments. HART allows two-way digital communications to 

occur without disturbing the integrity of the 4-20mA signal. HART signals 

are carried over the same wiring that is typically used for 4-20mA analog 

instruments. Instrumentation products equipped with the HART protocol are 

used in a wide range of applications and industries, providing cost saving 

benefi ts and improved performance worldwide. It has been estimated that 

nearly 2 million HART installations are in existence today and include: 

Rosemount, Endress & Hauser, Honeywell, and Yokagawa Transmitters. 

HART Interface Modules

ProSoft Technology has a variety of HART interface modules offering 

connectivity solutions for smart fi eld instrumentation that supports HART 

multi-drop networks. The HART modules provide access to temperature, 

pressure, and multi-variable units, as well as, full access to digital 

confi guration, diagnostics, and maintenance information in each connected 

transmitter. 

In-Rack HART Multi-drop Modules

Modules are compatible with a number of platforms including AllenBradley’s ControlLogix, SLC 500e, PLC-5e, and CompactLogix™, as well as, 

Schneider Electric’s Quantum processors. 

Features

• Multi-drop Field Network

• Read / Write Data

• 4 Channels / Module

• 15 Transmitters / Channel

Stand-alone HART Gateways

The HART Gateways provide communication for four 

or eight channels or multi-drop HART connectivity with 

other networks including: 

• Modbus

• Modbus Plus

• Modbus TCP/IP

• DF1

• Profi bus DP

• A-B Remote I/O

Honeywell DE Connectivity

In-rack or stand-alone gateway connectivity solutions for smart fi eld 

instrumentation supporting Honeywell DE networks is also available 

through ProSoft.

Pipeline Automation

Valve Actuators

All pipelines contain a great number of valves. These valves work like gates, 

opening and closing oil or gas fl ow and can be placed every 5 to 20 miles 

(8-32 km) along any given stretch of pipeline. In remote or inaccessable 

areas it is important that the control of these valves are automated. 

ProSoft Technology has worked together with FlowServe, makers of 

Limitorque Valve Actuators, to create an interface which allows Allen-Bradley 

ControlLogix, SLC, and PLC processors to easily interface with Limitorque Valve 

Actuators and other Limitorque protocol compatible devices. The Limitorque 

modules support the following valves:

 • MX/DDC Modbus

 • UEC-3-DDC Modbus

 • DDC-100M I/O module

 • DDC-100M fi eld unit

 • Valvcon IVO (unit in multi-drop mode only)