In-Cabinet Distributed I/O

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1797 FLEX Ex I/O

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 (IE8H and OE8H) 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. Device Type Management (DTM) programs and drivers are provided on the website.

• FLEX HART analog modules can be used on ControlNet or EtherNet/IP. The FLEX Ethernet adapter requires firmware v3.1, which is flash upgradeable, to support these modules.
  
• Each HART field device is wired to its own input or output channel:
  
  • 8 single-ended channels
    
  • does not support multi-drop
    
  • 2- or 3-wire devices
    
• For use with FlexLogix, the modules must be used on distributed rail with ControlNet adatper and not on local rail.
  
• HART commands can be transmitted by unscheduled message::
  
  • sample RLL subroutines available
    
  • currently limited to of one instance of RLL subroutine per module, one channel at at time
    

HART Analog Input Module

Cat. No.	Number of Inputs	Input Signal Range⋆	Update Time, Module from Adapter	Step Response to 99% of Full Scale	Power Dissipation, Max.	Terminal Base Unit
1797-IE8H‡	8 single-ended	0…20 mA	200…1600 ms	80 ms	5.2 W	1797-TB3, 1797-TB3S
⋆ Each module's channels are selectable. ‡ Supports pass-through of HART commands as unscheduled ControlNet messages. Compatible with FDT software packages.

HART Analog Output Module

Cat. No.	Number of Outputs	Output Signal Range⋆	Step Response to 99% of Full Scale	Power Dissipation, Max.	Terminal Base Unit
1797-OE8H‡	8 single-ended	4…20 mA	4 ms	6.1 W	1797-TB3, 1797-TB3S
⋆ Each module's channels are selectable. ‡ Supports pass-through of HART commands as unscheduled ControlNet messages. Compatible with FDT software packages.

1797-OE8 and -OE8H Output Voltage/Current Capability



Certifications

Cat. No.	Certifications⋆
1797-IE8H	CENELEC: II (1) 2G EEx ia/ib IIB/IIC T4 II (1D) (2D) UL, C-UL: Class I Division 1 Groups A...D T4 Class I Zone 1 AEx ib/[ia] IIC T4 Class II Division 1 Groups E, F, G; Class III FM: Class I Division 1 Groups A...D T4 Class I Zone 1 AEx ib/[ia] IIC T4
1797-OE8H	CENELEC: II (1) 2G EEx ia/ib IIB/IIC T4, II (1D)(2D)
⋆ See the Product Certification link at http://www.ab.com for declarations of Conformity, Certificates, and other certification details. For additional certification information, see the FLEX Ex System Certification manual, publication 1797-6.5.6.