Allen-Bradley 1794-IR8 | Flex I/O RTD Analog Input Module

Overview

The 1794-IR8 is an 8-channel RTD analog input module, ideal for industrial temperature measurement and precision process control applications.

Electrical Specifications

• Inputs: 8 channels supporting 100Ω, 200Ω, 500Ω Pt, Nickel, and Copper RTDs

• Nominal Input Range: 1 to 433 ohms

• RTD Excitation Current: 718.36 µA

• Resolution: 16-bit across 435 ohms

• Accuracy: 0.05% full scale (Normal Mode), 0.01% full scale (Enhanced Mode)

• Data Format: 16-bit 2’s complement or offset binary (unipolar)

• Normal Mode System Throughput: Programmable 28ms–325ms per channel

Performance & Noise Handling

• Normal Mode Noise Rejection: -60 dB at 60 Hz

• Channel Bandwidth: 0 to 2.62 Hz

• Enhanced Mode Throughput: Programmable 56ms–650ms per channel

• FlexBus Current: 20 mA

• Power Dissipation: 3 W @ 31.2 VDC max

• Thermal Dissipation: 10.2 BTU/hr @ 31.2 VDC max

Physical & Environmental Specifications

• Mounting: DIN Rail

• Operating Temperature: 0 to 55°C (32 to 131°F)

• Storage Temperature: -40 to 85°C (-40 to 185°F)

• Vibration: 5 g @ 10–500 Hz

• Shock: 30 g

• Isolation Voltage: 850 VDC

Connectivity & Integration

• Terminal Base Compatibility: 1794-TB2, 1794-TB3, 1794-TB3T

• Communication: Flex I/O network

• Enables seamless integration with other Flex I/O analog input and output modules

Applications

• Industrial temperature monitoring and control

• Process automation requiring precise RTD measurements

• Integration into complex control systems with multiple analog inputs