PRODUCT INFORMATION
Product Overview
The Allen-Bradley 1797-IE8 is an intrinsically safe I/O Module within the FLEX I/O series. This Flex Ex unit provides eight non-isolated analog input channels for classified hazardous environments. Each channel independently accepts 0 to 20 mA or 4 to 20 mA current signals. Internal analog-to-digital conversion provides 16-bit resolution with configurable data formats. Measurement accuracy reaches 0.1 percent of output signal range at 20 degrees Celsius.
The module features internal diagnostics to detect lead breakage, overrange, underrange, and remote transmitter alarms. It mounts onto an intrinsically safe 1797-TB3 or 1797-TB3S terminal base unit. Standard non-Ex FLEX I/O terminal bases cannot be used with this module. The terminal base keyswitch must be set to position 3 for proper installation. Recommended field wiring uses 4 mm2 stranded copper conductors with 1.2 mm maximum insulation.
TECHNICAL DATA
Technical Specifications
| Parameter | Specification |
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| UPC | 612598172870 |
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| Weight | 0.63 lbs (0.28 kg) |
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| Functional Data Range | >15V @ 22 mA >21.5V @ 0 mA |
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| Data Format | Configurable |
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| Resolution | 16 bits |
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| Product Description | Flex Ex analog input Module |
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| No. of inputs | Eight (8) non-isolated inputs |
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| IS input type | Ex ia IIB/IIC T4, AEx ia IIC T4, Class I, II, III Division 1 Group A-G T4 |
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| IS module type | Ex ib IIB/IIC T4, AEx ib IIC T4, Class I, Division 1 Group A-D T4 |
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| Indicators | 8 red fault indicators 1 green power indicator |
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| Terminal Base | 1797-TB3 or 1797-TB3S |
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| Conductor wire size | 4 mm2 (12 gauge) stranded; max 1.2 mm (3/64 in.) insulation max |
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| Keyswitch Position | 3 |
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| Inputs | 8 |
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| Input Type | Single-ended Non-isolated |
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| Module Field-side Power Consumption | 7.5 W |
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| Power Dissipation | 5.2 W |
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| Thermal Dissipation | 17.75 BTU/hour |
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| Step Response | 4 ms |
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TECHNICAL INFORMATION
Features
- Eight non-isolated single-ended analog current input channels.
- Individually configurable input ranges for 0 to 20 mA and 4 to 20 mA.
- Internal analog-to-digital conversion with 16-bit resolution.
- Internal diagnostics for lead breakage, overrange, underrange, and remote transmitter alarms.
- Status indicators including one green power LED and eight red fault LEDs.
- Intrinsically safe input ratings for Class I, II, and III Division 1 locations.
TECHNICAL INFORMATION
Applications
- Interfacing analog transmitters in Class I, II, and III Division 1 hazardous areas.
- Acquiring 0 to 20 mA and 4 to 20 mA process instrumentation signals.
- Connecting field transmitters requiring intrinsically safe Ex ia or Ex ib protection.
TECHNICAL INFORMATION
Connections / Interfaces
- Mounts onto 1797-TB3 or 1797-TB3S terminal base units.
- Supports field connection of eight single-ended analog current inputs.
- Accepts 4 mm2 stranded copper wire with maximum 1.2 mm insulation.
TECHNICAL INFORMATION
Installation Guidelines
- Rotate the terminal base keyswitch to position 3 before inserting the module.
- Never install this module into standard non-Ex FLEX I/O terminal bases.
- Ensure all wiring adheres to intrinsically safe installation practices.
TECHNICAL INFORMATION
Configuration Guidelines
- Configure each analog channel individually for 0 to 20 mA or 4 to 20 mA.
- Select compatible data formats using the controller configuration software.
- Configure lead breakage and range alarm limits to suit the field transmitter.
TECHNICAL INFORMATION
Compatibility
- Compatible with Allen-Bradley 1797-TB3 and 1797-TB3S terminal base units.
- Connects to Allen-Bradley FLEX Ex communication adapters.
TECHNICAL INFORMATION
Compliance and Certifications
- Ex ia IIB/IIC T4, AEx ia IIC T4, Class I, II, III Division 1 Group A-G T4.
- Ex ib IIB/IIC T4, AEx ib IIC T4, Class I, Division 1 Group A-D T4.
COMPATIBILITY
Compatibility & Replacement
COMPATIBLE MODELSCompatible with Allen-Bradley 1797-TB3 and 1797-TB3S terminal base units. Connects to Allen-Bradley FLEX Ex communication adapters.
Verify compatibility against the exact Part Number, revision and manufacturer documentation before ordering.
PART VERIFICATION
Before You Order
Industrial automation parts can share similar model names, suffixes and revisions. Confirm the complete manufacturer Part Number before purchase.
01Check Part NumberMatch the complete ordering code on the existing unit.
02Confirm RevisionCheck suffix, hardware or firmware when applicable.
03Send a Label PhotoWe can review a clear label photo when identification is uncertain.
ORDERING PROCESS
From RFQ to Dispatch
1Submit Part Number2Verify Product Identity3Confirm Stock & Condition4Issue Quotation5Dispatch & Tracking
PRODUCT FAQ
Frequently Asked Questions
Which terminal bases are compatible with the Allen-Bradley 1797-IE8?
The 1797-IE8 requires either a 1797-TB3 or 1797-TB3S terminal base unit.
What keyswitch setting is required for the 1797-IE8 module?
The terminal base keyswitch must be rotated to position 3.
What input signal types does the 1797-IE8 accept?
Each of the eight channels accepts 0 to 20 mA or 4 to 20 mA current signals.
What internal fault diagnostics are provided by the 1797-IE8?
The module detects lead breakage, remote transmitter alarms, and signal overrange or underrange conditions.
