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SKU: 1794-IE8

Allen-Bradley 1794-IE8 Flex 8 Point Analog Input Module

The Allen-Bradley 1794-IE8 is a high-precision 8-point analog input module for the FLEX I/O system. It supports 4-20mA and 0-10V signals with 12-bit resolution and RIUP capability.

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Versatile Process Signal Acquisition

The Allen-Bradley 1794-IE8 drives precise data acquisition within the FLEX I/O platform. This 8-channel module converts analog signals from field transmitters into digital data that your PLC can process. It supports a broad range of signal types, including 4-20mA current loops and ±10VDC voltage inputs. By providing 12-bit resolution, the 1794-IE8 ensures your control system receives the granular detail necessary for accurate process monitoring and PID loop control.

Distributed I/O Efficiency and Integration

Rockwell Automation designed the 1794-IE8 to streamline industrial wiring and reduce installation costs. The module snaps directly onto terminal bases like the 1794-TB2 or 1794-TB3, allowing you to terminate field sensors directly at the I/O point. This distributed architecture eliminates the need for long wire runs back to a central control cabinet. The module integrates seamlessly with various communication adapters, enabling high-speed data exchange over EtherNet/IP, ControlNet, or DeviceNet networks.

Industrial Reliability and Maintenance

The 1794-IE8 offers robust performance in harsh environments, maintaining its 0.20% accuracy even under fluctuating temperatures. A key advantage for maintenance teams is the “Removal and Insertion Under Power” (RIUP) capability; you can replace a faulty module without shutting down the rest of the FLEX I/O rack or disrupting system communications. This feature dramatically reduces downtime in 24/7 manufacturing and process operations.

Technical Specifications (List Format)

  • Manufacturer: Allen-Bradley / Rockwell Automation
  • Model Number: 1794-IE8
  • Product Family: FLEX I/O
  • Input Points: 8 Single-ended
  • Input Range (Current): 0 to 20 mA; 4 to 20 mA
  • Input Range (Voltage): ±10V; 0 to 10V
  • Resolution: 12-bit unipolar; 11-bit plus sign bipolar
  • Accuracy: 0.20% Full Scale at 25°C
  • Conversion Rate: 256μs for all channels
  • Terminal Bases: Compatible with 1794-TB2, 1794-TB3, 1794-TB3S, 1794-TBN
  • Operating Temperature: -20°C to 55°C (-4°F to 131°F)
  • Weight: 0.12 kg
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ParameterSpecification
ModelKJ3209X1-BA1 12P3905X012 VE4002S2T1B1
BrandEmerson
OriginUSA
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Dimensions16.8 x 8.7 x 4.4 cm
Operating Temp0 deg C to 60 deg C
Power Consumption24 VDC nominal

Process Loop Integration and Signal Isolation

The module processes binary field inputs through dedicated input filtering channels while maintaining channel-to-channel isolation to prevent electrical interference across loops. The internal circuitry supports 4-20 mA HART loop protocol integration for remote transmitter calibration and real-time diagnostic polling where applicable. Cold junction compensation (CJC) maintains auxiliary temperature measurement accuracy across ambient temperature shifts, while FOUNDATION Fieldbus and Profibus PA connectivity layers execute deterministic field device updates without loop degradation.

Frequently Asked Questions

Q: Does the module support live insertion and removal under power within the M-series subsystem?A: Yes. The hardware design permits online replacement of cards on powered carriers to maintain continuous operation of adjacent control loops.Q: How are field wiring errors isolated from internal processor components?A: Channel-to-channel galvanic isolation circuits prevent transient overvoltages from propagating across adjacent digital input channels or damaging internal logic planes.

Field Installation Guidelines

Mount the unit securely within designated carrier slots, ensuring that shielded signal cables terminate at the proper grounding bars to minimize electromagnetic interference. Verify loop supply voltage levels prior to terminal block connection to protect discrete input stages against overvoltage conditions.
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