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Installation Instructions
FLEX I/O Isolated Output HART Analog
Module
Catalog number 1794-OF8IH
Table of Contents
Topic
This module can only be used with 1794-ACN(R)15 with version 5.1 (or
IMPORTANT
greater) firmware, or 1794-AENT with version 4.2 (or greater) firmware.
The 1794-AENT currently ships with version 4.1 firmware. For more
information about using this module with 1794-ACN(R)15 with version 5.1
(or greater) firmware, see 1794-RN071.
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Summary of Contents for Allen-Bradley 1794-OF8IH
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Page 1: Table Of Contents
Installation Instructions FLEX I/O Isolated Output HART Analog Module Catalog number 1794-OF8IH Table of Contents Topic Page Important User Information Environment and Enclosure Preventing Electrostatic Discharge North American Hazardous Location Approval European Hazardous Location Approval Install the Module Wire the Module... -
Page 2: Important User Information
2 FLEX I/O Isolated Output HART Analog Module Important User Information Solid-state equipment has operational characteristics differing from those of electromechanical equipment. Safety Guidelines for the Application, Installation, and Maintenance of Solid-State Controls (Publication SGI-1.1 available from your local Rockwell Automation Sales Office or online at http://www.rockwellautomation.com/literature/) describes some important differences between solid-state equipment and hard-wired electromechanical devices. -
Page 3: Environment And Enclosure
FLEX I/O Isolated Output HART Analog Module Environment and Enclosure ATTENTION: This equipment is intended for use in a Pollution Degree 2 industrial environment, in overvoltage Category II applications (as defined in IEC publication 60664-1), at altitudes up to 2000 m (6562 ft) without derating. This equipment is considered Group 1, Class A industrial equipment according to IEC/CISPR Publication 11. -
Page 4: North American Hazardous Location Approval
4 FLEX I/O Isolated Output HART Analog Module North American Hazardous Location Approval The following modules are North American Hazardous Location approved: 1794-OF8IH. The following information applies when Informations sur l’utilisation de cet operating this equipment in hazardous équipement en environnements dangereux: locations: Products marked "CL I, DIV 2, GP A, B, C, D"... -
Page 5: European Hazardous Location Approval
EN60529 and used in an environment of not more than pollution degree • This equipment shall be used within its specified ratings defined by Allen-Bradley. • Provision shall be made to prevent the rated voltage being exceeded by the transient disturbances of more than 140% of the peak rated voltage. - Page 6 6 FLEX I/O Isolated Output HART Analog Module ATTENTION: FLEX™ I/O is grounded through the DIN rail to chassis ground. Use zinc plated yellow-chromate steel DIN rail to assure proper grounding. The use of other DIN rail materials (for example, aluminum or plastic) that can corrode, oxidize, or are poor conductors, can result in improper or intermittent grounding.
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Page 7: Install The Module
FLEX I/O Isolated Output HART Analog Module Install the Module Read this for information about how to install the module, which mounts on a 1794-TB3 or 1794-TB3S terminal base. 44341 Description Description Keyswitch Alignment bar Terminal base Groove Flexbus connector Latching mechanism Module ATTENTION: During mounting of all devices, be sure that all debris (metal... -
Page 8: Wire The Module
8 FLEX I/O Isolated Output HART Analog Module 2. Make certain the flexbus connector (3) is pushed all the way to the left to connect with the neighboring terminal base/adapter. IMPORTANT You cannot install the module unless the connector is fully extended. 3. -
Page 9: Ground The Module9
FLEX I/O Isolated Output HART Analog Module 3. Connect the +V DC power lead to terminal 34 on the 34…51 row C, and the -V common/return to terminal 16 on the 16…33 row B. ATTENTION: To reduce susceptibility to noise, power analog modules and digital modules from separate power supplies. -
Page 10: Module Wiring
10 FLEX I/O Isolated Output HART Analog Module Module Wiring Row A 9 10 11 12 13 14 15 Row B 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 Row C 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 Label placed at top of wiring area... - Page 11 FLEX I/O Isolated Output HART Analog Module Wire Connections Channel Signal Label Catalog Numbers Type Markings 1794-TB3 or 1794-TB3S Terminal Current Current O4 Ret Current A-10 Current O5 Ret A-11 Current A-12 Current O6 Ret A-13 Current A-14 Current O7 Ret A-15 -V DC For catalog numbers 1794-TB3 and 1794-TB3S, terminals B-16…33 are internally...
- Page 12 12 FLEX I/O Isolated Output HART Analog Module Output Map Word DG7 DG6 DG5 DG4 DG3 DG2 DG1 DG0 Channel 0 Output Data Channel 1 Output Data Channel 2 Output Data Channel 3 Output Data Channel 4 Output Data Channel 5 Output Data Channel 6 Output Data Channel 7 Output Data DGn =...
- Page 13 FLEX I/O Isolated Output HART Analog Module Configuration Map Word DH7 DH6 DH5 DH4 DH3 DH2 DH1 DH0 Reserved CH 3 Format CH 2 Format CH 1 Format CH 0 Format CH 7 Format CH 6 Format CH 5 Format CH 4 Format CH1 HART Current Ratio AFS1...
- Page 14 14 FLEX I/O Isolated Output HART Analog Module Configuration Map Descriptions Byte order group A Byte order group A and B values must match each other. Byte order group B Refer to Byte Order table. LocalFaultMode 0 = Outputs set to 1 = Output set to safe safe value on value on any fault...
- Page 15 FLEX I/O Isolated Output HART Analog Module Byte Order Byte Order Byte Order Group B Group A Bit 9 Bit 8 Bit 1 Bit 0 Description Little Endian Format (default) — all data entries in true Little Endian format. Word Swap — word swap only values requiring more than one word, for example, 32 bit float values.
- Page 16 16 FLEX I/O Isolated Output HART Analog Module Bits HART Current Ratio Limit Decimal Value Channel Data Formats Bits 15 14 13 12 11 10 9 Signal Range User Range Format Format Name Resolution 1.0 μA 0...20 mA in 0.00 22.00 22000 Milliamps...
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Page 17: Cyclic Hart Input Data
FLEX I/O Isolated Output HART Analog Module Format Values Format Format Name 0.0 mA 2.0 mA 4.0 mA 20.0 mA 22.0 mA 0...20 mA in Milliamps 2000 4000 20000 22000 0...20 mA in % Full Scale 1000 2000 10000 11000 0...20 mA in UINT 6554 13107... - Page 18 18 FLEX I/O Isolated Output HART Analog Module Word CH0 HART Secondary Value (IEEE 754-1985 Single-Precision 32-bit floating point) CH0 HART Tertiary Value (IEEE 754-1985 Single-Precision 32-bit floating point) CH0 HART Fourth (Quaternary) Value (IEEE 754-1985 Single-Precision 32-bit floating point) CH0 SV Units Code CH0 PV Units Code CH0 FV Units Code...
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Page 19: Status Indicator
FLEX I/O Isolated Output HART Analog Module CHn: HART Field Device Status Refer to User Manual (HART CMD 3 Response second status byte) CHn HART Loop Status Bit 0 = HART Enable 0 = Disabled 1 = Enabled Bit 1 = Device Connected 0 = Not connected 1 = Connected Bit 2 = Response Error... -
Page 20: Specifications
20 FLEX I/O Isolated Output HART Analog Module Specifications Specifications – FLEX I/O Isolated Output Analog Module – 1794-OF8IH Attribute Value Number of outputs 8 single-ended, isolated Recommended terminal base unit 1794-TB3, 1794-TB3S Resolution 16-bits – unipolar 0.305 μA/cnt – unipolar... - Page 21 FLEX I/O Isolated Output HART Analog Module Specifications – FLEX I/O Isolated Output Analog Module – 1794-OF8IH Attribute Value Terminal base screw torque Determined by installed terminal base Dimensions, approx. (H x W x D 94 x 94 x 66 mm (3.7 x 3.7 x 2.6 in.)
- Page 22 22 FLEX I/O Isolated Output HART Analog Module Environmental Specifications Attribute Value Operating temperature IEC 60068-2-1 (Test Ad, Operating Cold), IEC 60068-2-2 (Test Bd, Operating Dry Heat), IEC 60068-2-14 (Test Nb, Operating Thermal Shock): 0…55 °C (32…131 °F) Storage temperature IEC 60068-2-1 (Test Ab, Unpackaged Non-operating Cold), IEC 60068-2-2 (Test Bb, Unpackaged Non-operating Dry Heat), IEC 60068-2-14 (Test Na, Unpackaged Non-operating Thermal Shock):...
- Page 23 FLEX I/O Isolated Output HART Analog Module Certifications Certifications (when Value product is marked) c-UL-us UL Listed Industrial Control Equipment, certified for US and Canada. See UL File E65584. UL Listed for Class I, Division 2 Group A,B,C,D Hazardous Locations, certified for U.S.
- Page 24 RA-DU002, available at http://www.rockwellautomation.com/literature/. Allen-Bradley, Rockwell Automation, FLEX I/O, and TechConnect are trademarks of Rockwell Automation, Inc. Trademarks not belonging to Rockwell Automation are property of their respective companies. Publication 1794-IN120D-EN-P - September 2015...
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