Allen-Bradley 1794-IR8 8-Channel Isolated Input Module

Product Description

Configured for isolated analog signal acquisition in a 1794 FLEX I/O system, the Allen-Bradley 1794-IR8 (1794-IR8 8-Channel Isolated Input Module) accepts voltage, current, and contact-closure inputs from field devices. Its channel isolation separates input circuits to limit electrical interaction between field signals and the I/O system.

Hardware Specifications

I/O Density and Backplane Integration

The 1794-IR8 provides eight isolated input channels within the FLEX I/O architecture. The module processes individual field input circuits while the FLEX I/O adapter provides system-level communication with the controller. Channel-level isolation separates the connected input circuits and limits the propagation of electrical disturbances between channels.

For system design, the 8-channel density allows multiple field signals to be grouped within the FLEX I/O station while maintaining separate input circuits.

Frequently Asked Questions

Q: What input signals does the 1794-IR8 accept?
A: The module accepts 0-30 VDC voltage inputs, 0-20 mA current inputs, and contact-closure inputs.

Q: Are the eight input channels isolated?
A: The supplied specifications state 250 VAC channel-to-channel isolation and isolation between the input channels and the system.

Q: What is the module power requirement?
A: The supplied data specifies a 5 VDC supply with a current consumption of 300 mA.

Field Installation Guidelines

Install the 1794-IR8 within the specified 1794 FLEX I/O system architecture and use the appropriate FLEX I/O terminal assembly for field wiring. Verify the input signal type before connecting each channel.

Separate analog signal wiring from high-voltage and high-current conductors where practical. Use shielded instrumentation cable when the field environment has significant electrical noise. Terminate cable shields according to the plant grounding standard and avoid creating unintended ground loops.

Verify field polarity, voltage range, current range, and contact wiring before energizing the module. Confirm that the connected signal remains within the specified 0-30 VDC or 0-20 mA input range.

Maintain the specified operating temperature and non-condensing humidity conditions. The IP20 rating does not provide protection against water or dust ingress beyond the stated enclosure classification.

Other Attributes

• Series: Allen-Bradley Flex I/O
• Country of Origin:  USA
• Lead Time: In Stock, 2 Working Days

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