Allen-Bradley 1794-IR8 RTD Input Module

The Allen-Bradley 1794-IR8 serves as a specialized analog interface for Resistance Temperature Detectors (RTD). This module effectively converts low-level resistance signals into digital data for industrial controllers. It features eight independent channels designed for platinum, nickel, and copper sensors. Furthermore, the unit provides a 16-bit resolution to ensure granular measurement accuracy. This capability makes it indispensable for sensitive process industries like chemical or food production. The 1-433 ohm input range accommodates a broad variety of industrial sensing elements.

Measurement Performance and Accuracy

This module delivers exceptional signal integrity through advanced filtering and noise rejection. It achieves a 0.05% full-scale accuracy when operating in standard mode. Conversely, users can switch to enhanced mode for 0.01% precision. The hardware effectively suppresses electrical interference with a -60dB rating at 60Hz. Additionally, the unit maintains stable readings with a 718.36μA excitation current. Programmable throughput allows for scan rates as fast as 28ms across all eight channels. These features support responsive temperature control in dynamic automated environments.

System Safety and Isolation

The 1794-IR8 incorporates robust electrical protection to safeguard system uptime. It features 707V DC isolation between the field-side inputs and the backplane logic. This barrier prevents ground loops and protects the controller from voltage spikes. Moreover, the module includes continuous overvoltage protection up to 35V DC. The compact DIN-rail design allows for easy installation on standard FLEX I/O terminal bases. It operates reliably within a wide temperature compensation range to ensure data consistency.

Technical Specifications