Product Overview

The Allen-Bradley 1762-IF4​ (also referenced as Rockwell Automation 1762-IF4) is a compact, high-precision 4-channel differential analog input expansion module designed specifically for the MicroLogix™ 1100, 1200, and 1400 programmable logic controller families. Part of the rackless 1762 series I/O expansion system, the Allen-Bradley 1762-IF4​ enables small- to mid-scale automation platforms to acquire real-world process variables—such as temperature, pressure, flow, level, or position—from standard industrial transmitters and transducers with excellent resolution and noise immunity. Each of the four input channels on the Allen-Bradley 1762-IF4​ can be independently software-configured to accept voltage signals (±10 VDC, 0–10 VDC, 0–5 VDC) or current loop signals (4–20 mA, 0–20 mA) via onboard DIP switches and RSLogix™ 500 / 5000 configuration, making it a versatile solution for mixed-signal process monitoring applications.Engineered around a Delta-Sigma (Δ-Σ) analog-to-digital converter architecture offering 15 bits plus sign (effectively 16-bit resolution), the Rockwell Automation 1762-IF4​ delivers typical full-scale accuracy of ±0.24% at 25°C and ±0.32% across its full operating temperature range of –20 to +65°C. The module interfaces seamlessly with the MicroLogix backplane through a high-performance expansion bus, draws power directly from the 5 VDC and 24 VDC backplane supplies, and features finger-safe removable screw terminal blocks for safe field wiring. With Class I Division 2 hazardous location certification, reinforced I/O-to-system isolation (tested at 500 VAC / 707 VDC), and built-in channel diagnostics for over-range, under-range, and open-circuit detection, the Allen-Bradley 1762-IF4​ is a trusted choice for reliable analog signal acquisition in demanding industrial environments.

Technical Specifications

Product Model | 1762-IF4Manufacturer | Rockwell Automation / Allen-BradleyProduct Type | 4-Channel Differential Analog Input Expansion Module (MicroLogix 1762 Series)Number of Input Channels | 4 differential (bipolar) analog inputsInput Signal Types | Voltage: ±10 VDC, 0–10 VDC, 0–5 VDC; Current: 4–20 mA, 0–20 mA (per channel configurable)A/D Converter Resolution | 15 bits + sign (16-bit effective), Delta-Sigma (Δ-Σ)Overall Accuracy | ±0.24% FS @ 25°C; ±0.32% FS @ –20…+65°CInput Impedance | Voltage mode: 200 kΩ (typ.); Current mode: 250 Ω (typ.)Backplane Current Draw | 40 mA max @ 5 VDC; 50 mA max @ 24 VDCCommon Mode Rejection | >55 dB @ 50 Hz & 60 HzInput Update Time | Selectable: 130 ms / 250 ms / 290 ms / 450 ms / 530 ms (typical)Isolation (Field-to-Backplane) | Reinforced insulation, 500 VAC / 707 VDC 1-min test, 30 VAC/DC working voltage (Class 2)Operating Temperature | –20 °C to +65 °C (–4 °F to +149 °F)Mounting | 35 mm DIN rail or panel mount; removable finger-safe screw terminalsDimensions (H × W × D) | 90 mm × 40 mm × 87 mm (3.54″ × 1.59″ × 3.43″)Weight | Approx. 0.18 kg (0.40 lb)

Main Features and Advantages

High-resolution signal acquisition: The Allen-Bradley 1762-IF4​ employs a Delta-Sigma A/D converter delivering 15-bit + sign resolution, enabling precise measurement of slow-changing process variables from 4–20 mA transmitters or ±10 V analog sensors. This level of granularity supports closed-loop PID control and trend logging without requiring external signal conditioners.Flexible per-channel configuration: Each of the four differential input channels on the 1762-IF4​ can be individually set to voltage or current mode through RSLogix 500 programming software in conjunction with hardware DIP switch selection. Supported ranges include ±10 VDC, 0–10 VDC, 0–5 VDC, 4–20 mA, and 0–20 mA, allowing mixed-signal applications—such as reading both a pressure transmitter (4–20 mA) and a potentiometer (0–10 V)—on a single module.Robust industrial noise immunity: With >55 dB common-mode rejection at 50/60 Hz power line frequencies and differential (bipolar) input topology, the Allen-Bradley 1762-IF4​ excels in electrically noisy plant environments such as near VFDs, large motors, or welding equipment. The module also provides over-range, under-range, and open-circuit diagnostics reported as individual status bits in the controller data table, simplifying fault detection and reducing troubleshooting time.Seamless MicroLogix integration and safety: The 1762-IF4​ connects directly to the right-side expansion port of a MicroLogix 1100, 1200, or 1400 CPU (or to another 1762 module in the chain) with no separate rack or power supply required. Finger-safe removable terminal blocks prevent accidental contact during wiring, and the module carries UL, cUL, CE, and Class I Division 2 Groups A–D hazardous-location approvals for deployment in oil & gas, chemical, and process industries.Compact rackless design: As part of the 1762 expansion family, the Allen-Bradley 1762-IF4​ uses a small footprint (40 mm width) that conserves panel space and allows distributed I/O expansion up to the maximum supported by the host controller (4 modules for MicroLogix 1100, 6 for 1200, 7 for 1400). This modular approach minimizes spare parts inventory and simplifies system scalability.

Application Field

The Allen-Bradley 1762-IF4​ is purpose-built for small- to medium-scale process and machine automation applications where accurate analog signal measurement is required but a full-sized rack-based control system would be cost-prohibitive. In water and wastewater treatment plants, the 1762-IF4​ commonly acquires 4–20 mA signals from pH probes, dissolved oxygen sensors, turbidity meters, and ultrasonic level transmitters to enable SCADA-integrated process monitoring and pump control within a MicroLogix 1400-based panel. Food and beverage packaging lines use the Allen-Bradley 1762-IF4​ to read load-cell amplifiers for check-weighing stations and to monitor filler-head pressures via 0–10 VDC signals, supporting recipe-driven batch operations.In HVAC and building automation retrofits, the 1762-IF4​ interfaces with duct static-pressure transducers and outside-air temperature sensors, feeding analog data into MicroLogix 1200 controllers for economizer logic and damper modulation. Material handling systems—particularly conveyor lines with variable-frequency drives—employ the Allen-Bradley 1762-IF4​ to monitor motor current feedback or tension transducer outputs, leveraging the module’s strong common-mode noise rejection to maintain signal integrity adjacent to VFD-generated electrical noise.The module is equally well-suited for OEM machine builders who embed MicroLogix controllers into compact machinery such as plastic injection molding presses, metal stamping equipment, and textile looms. Here the 1762-IF4​ provides cost-effective analog data acquisition for mold-cavity pressure, hydraulic system pressure, or oven-zone temperature—all critical to product quality—while keeping the control cabinet footprint minimal. Its Class I Division 2 listing also makes the Allen-Bradley 1762-IF4​ viable for light-duty hazardous-area installations in upstream oil & gas skids and chemical blending stations when properly installed in a suitable enclosure.

Related Products

• 1762-OF4​ — 4-channel analog output module (single-ended) for MicroLogix 1100/1200/1400; provides 0–10 VDC or 4–20 mA output signals, typically paired with the 1762-IF4 in mixed I/O panels.
• 1762-IF2OF2​ — Combination analog module with 2 differential analog inputs and 2 single-ended analog outputs; space-saving alternative when fewer I/O points are needed.
• 1762-IR4​ — 4-channel RTD/resistance input module for direct connection of 100Ω Pt, 1000Ω Pt, Ni, and Cu RTDs; used when temperature measurement does not require a separate transmitter.
• 1762-IT4​ — 4-channel thermocouple / millivolt input module with cold-junction compensation (CJC); ideal for direct Type J/K/T/E/N thermocouple connections.
• 1766-L32BWA / 1766-L32BXB​ — MicroLogix 1400 base units (AC- or DC-powered) that serve as the host controller for up to seven 1762 expansion modules including the 1762-IF4.
• 1762-UM001​ — Official Rockwell Automation user manual for MicroLogix 1200 controllers and 1762 expansion I/O, containing wiring diagrams and configuration procedures for the 1762-IF4.
• Micrologix 1200 (1762-L40BXB / 1762-L40AWB)​ — MicroLogix 1200 CPU bases compatible with the 1762-IF4 (supports up to six expansion modules).