Product Overview
The Allen-Bradley 1734-IR2 is a Resistance Temperature Detector (RTD) input module from the POINT I/O series. It provides two single-ended, non-isolated input channels, each capable of reading a wide range of RTD sensors, including 100 Pt α = 0.00385, 200 Pt α = 0.00385, 100 Pt α = 0.003916, 200 Pt α = 0.003916, 10 Cu α = 0.00427, 100 Ni α = 0.00618, 120 Ni α = 0.00618, and 120 Ni α = 0.00672. Additionally, it accepts direct wiring of 0-600 Ω analog signals, making it a versatile choice for temperature and resistance measurement.
Technical Specifications
Key specifications of the 1734-IR2 include:
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Module Type: RTD / Resistance input module
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Series: POINT I/O
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No. of Inputs: 2 single-ended, non-isolated channels
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Resolution: 16 bits – 9.5 mΩ/cnt; 0.03 °C/cnt (Pt385 @ 25 °C) or 0.05 °F/cnt (Pt385 @ 77 °F)
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Absolute Accuracy: 0.1% Full Scale @ 25 °C
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Input Step Response (per channel): 60 ms @ Notch = 50 Hz; 50 ms @ 60 Hz; 30 ms @ 100 Hz; 25 ms @ 120 Hz; 15 ms @ 200 Hz; 13 ms @ 240 Hz; 10 ms @ 300 Hz; 8 ms @ 400 Hz; 6 ms @ 480 Hz
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Input Update Rate (per module): 40 ms @ 50 Hz; 33 ms @ 60 Hz (default); 20 ms @ 100 Hz; 17 ms @ 120 Hz; 10 ms @ 200 Hz; 8 ms @ 240 Hz; 7 ms @ 300 Hz; 5 ms @ 400 Hz; 4 ms @ 480 Hz
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Current Draw: 220 mA @ 5V dc
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Power Dissipation: 1.0 W @ 28.8V DC
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Isolation Voltage: 50 Volts Continuous
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Thermal Dissipation: 3.3 BTU/hour
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Operating Temperature: -20 to 55 °C
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Dimensions (H x W x D): 2.21 x 0.47 x 2.97 in. (56 x 12 x 75.5 mm)
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Weight: 0.08 lb (0.036 kg)
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Enclosure Type Rating: None (open-style)
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Module Location: 1734-TB, 1734-TBS, 1734-TOP, or 1734-TOPS wiring base assembly
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Conversion Type: Delta Sigma
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Data Format: Signed Integer
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Keyswitch Position: 6
Industry Applications
The 1734-IR2 is ideal for applications requiring precise temperature monitoring and resistance measurement. Common uses include:
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Process Control: Monitor RTD sensors in chemical or food processing lines to ensure product quality.
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Machine Monitoring: Track bearing temperatures or motor windings in industrial machinery to predict failures.
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HVAC Systems: Measure temperature in large commercial buildings to optimize energy usage.
Its compatibility with a wide range of RTD types and resistance inputs makes it a flexible solution for diverse industrial environments.
Installation & Setup
The 1734-IR2 mounts onto a 1734-TB, 1734-TBS, 1734-TOP, or 1734-TOPS wiring base assembly. Ensure the module is inserted with the correct keyswitch position (position 6) to prevent mismatching. Wire the RTD sensors or resistance inputs to the appropriate terminals on the base. Set the notch filter frequency via software to match your power line frequency (50 Hz or 60 Hz) for optimal noise rejection. The module automatically configures when connected to a POINT I/O network.
Maintenance & Reliability
With no moving parts and a robust design, the 1734-IR2 requires minimal maintenance. Regularly inspect wiring connections for corrosion or looseness, especially in high-vibration environments. Keep the module clean and free of dust, as the open-style enclosure offers no environmental protection. Operating within the specified temperature range (-20 to 55 °C) ensures long-term reliability and consistent accuracy.
Compatibility & Integration
As part of the POINT I/O series, the 1734-IR2 integrates seamlessly with Rockwell Automation control platforms, including CompactLogix and ControlLogix systems. It communicates over the POINT I/O backplane, eliminating the need for additional interface modules. The module supports direct connection to a wide array of RTD sensors and resistance inputs, providing straightforward integration into existing automation architectures.
Buying Guide
When selecting the 1734-IR2, verify that your system has an available POINT I/O slot and the correct wiring base (1734-TB, 1734-TBS, 1734-TOP, or 1734-TOPS). Confirm the sensor types you plan to use are within the supported list. For genuine Allen-Bradley parts and reliable supply, consider PLC Source PRO as your automation partner—offering quality products and expert support for your control system needs.