A-B 1762-IF4 Analog Input Module

The Allen-Bradley 1762-IF4 is a 4-channel analog input expansion module for the MicroLogix 1100 / 1200 PLC series. It is used to collect analog signals such as voltage (±10V) or current (4–20 mA) and convert them into digital values for PLC processing.

Product Information

• Brand: Allen-Bradley (Rockwell Automation)
• Series: MicroLogix 1200 Expansion I/O
• Part Number: 1762-IF4
• Type: Analog Input Module
• Channels: 4 differential inputs
• Signal types: Voltage / Current
  • Voltage: -10V to +10V DC
  • Current: 4–20 mA (and bipolar range)
• Resolution: ~15-bit A/D conversion
• Mounting: DIN rail / side-mounted to MicroLogix base unit
• Wiring: Screw terminal block + ribbon cable interface

Function (Simple Explanation)

This module is used to:

• Read sensor signals (pressure, temperature, level, etc.)
• Convert analog signals into PLC readable numeric values
• Send data into MicroLogix CPU for logic control

Example:
Pressure sensor (4–20 mA) → 1762-IF4 → PLC → pump control logic

Key Characteristics

• 4 independent analog input channels
• Supports voltage and current signals
• High resolution (~15-bit) for good measurement accuracy
• Built-in signal diagnostics (overrange / underrange detection)
• Compact expansion module design for MicroLogix PLCs
• Easy integration via ribbon cable system

Typical Applications

• Pressure transmitters (4–20 mA)
• Temperature transmitters (0–10V / 4–20mA)
• Level sensors
• Flow measurement systems
• Industrial process control systems
• Pump control and feedback loops

System Role

It acts as a signal conversion interface:

Field sensors
→ analog wiring
→ 1762-IF4 module
→ MicroLogix PLC CPU
→ control output (relays / motors / drives)

Advantages

• Simple expansion for MicroLogix PLC systems
• Reliable industrial signal conversion
• Supports standard industrial sensor signals
• Good resolution for process control applications
• Built-in channel diagnostics improves maintenance

Precautions

• Must configure correct input type (V or mA) in PLC program
• Shielded cables recommended to reduce noise
• Grounding is important for stable analog readings
• Do not exceed input limits (±10V / 21 mA range)
• Scaling is required in PLC program to convert raw values into engineering units