In-Cabinet Distributed I/O

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1794 FLEX I/O

Introduction Product Design Typical Configurations Specifications I/O Communication Adapters Digital I/O Modules
Analog, Thermocouple, and RTD I/O Modules Specialty I/O Modules HART Smart Instrumentation Terminal Bases and Accessories Power Supplies Encompass Partner Products
HART Smart Instrumentation

HART (Highway Addressable Remote Transmitter) is an open protocol designed to connect analog devices. For HART connectivity, select from products available from Rockwell Automation and our Encompass partners.

Select a HART Interface

For Your Application Select Description
  • Analog and HART in one module

  • Instrumentation in hazardous locations (FLEX Ex modules)

  • Supports FDT-compatible asset management software to HART devices using provided DTMs

  • HART commands can be transmitted as unscheduled messages
  • 1794 FLEX I/O
    1797 FLEX Ex I/O
    FLEX I/O and FLEX Ex modules designed for distributed HART systems.
  • Analog and HART connectivity in one module

  • No external hardware required to access HART signal

  • HART commands can be transmitted as unscheduled messages

  • Supports asset management software to HART device
  • 1756-IF8H
    1756-OF8H
    Rockwell Automation analog I/O modules for use in ControlLogix chassis
  • Data acquisition or control application with slow update requirements (such as a tank farm)

  • No external hardware required to access HART signal

  • Does not connect directly to asset management software
  • MVI56-HART Prosoft interface
      

    HART Interface Modules

    FLEX and FLEX Ex HART analog modules are ideal for use in applications that need connection with FDT (Field Device Tool) compatible asset management software, such as the Rockwell Software FieldCare HART Communication bundle or Endress + Hauser Fieldcare. For HART Device Type Management (DTM) programs and drivers, go to the Product Compatibility & Download Center at http://compatibility.rockwellautomation.com/Pages/MultiProductDownload.aspx?crumb=112 .


    HART Analog Input Module

    Cat. No. Number of Inputs Signal Range Input Conversion Rate Input Resolution Absolute Accuracy Step Response to 99% External DC Supply Current, Nom. Power Dissipation, Max. Terminal Base Unit
    1794-IE8H 8 single-ended Non-isolated 4…20 mA 10 ms (50 Hz) / 8.33 ms (60 Hz) 16 bits 0.1% Full Scale at 20 °C (68 °F) 80 ms (current terminal) 190 mA at 24V DC 3.9 W at 31.2V DC 1794-TB3G or 1794-TB3GS
    1794-IF8IH 8 single-ended Isolated 4…20 mA (user configurable)
    0…20 mA (user configurable)
    16 bits - unipolar; 15 bits + sign - bipolar
    0.320 mA/cnt unipolar; 0.640 mA/cnt bipolar
    0.1% Full Scale at 25 °C 4.17 Hz conversion rate = 480 ms
    10.0 Hz conversion rate = 200 ms
    16.7 Hz conversion rate = 120 ms
    19.6 Hz conversion rate = 101 ms
    62 Hz conversion rate = 32 ms
    470 Hz conversion rate = 4 ms
    190 mA at 24V DC 4.8 W at 31.2V DC 1794-TB3 or 1794-TB3S
      

    HART Analog Output Module

    Cat. No. Number of Outputs Signal Range Output Conversion Rate Output Resolution Absolute Accuracy Step Response to 99% External DC Supply Current, Nom. Power Dissipation, Max. Terminal Base Unit
    1794-OE8H 8 single-ended Non-isolated 4…20 mA
    0…20 mA
    10 ms for all channels 13 bits 0.1% Full Scale at 20 °C (68 °F) 13 ms to 99% of FS / 115 ms during HART comms 190 mA at 24V DC 6.1 W at 31.2V DC 1794-TB3G or 1794-TB3GS
    1794-OF8IH 8 single-ended Isolated 4…20 mA (user configurable)
    0…20 mA (user configurable)
    10 ms 16 bits - unipolar
    0.305 mA/cnt unipolar
    ± 0.1% Full Scale at 25 °C
    ± 0.35% Full Scale at 0…55 °C
    450 mA at 24V DC 5.0 W at 31.2V DC 1794-TB3 or 1794-TB3S