Allen-Bradley 1771-IG 8-Point TTL Input Module | PLC-5 Series

Allen-Bradley 1771-IG | 8-Channel TTL Input Module for PLC-5 Systems

The Allen-Bradley 1771-IG is a special TTL input module for precise digital signals. It works with PLC-5 processors and needs two power sources to operate. This module is perfect for applications requiring high-speed TTL signal processing.

Detailed Technical Specifications

• Brand: Allen-Bradley (Rockwell Automation)
• Model: 1771-IG
• Input Type: 8-point TTL Digital Input
• Operating Voltage: 5.0-5.3 VDC TTL
• Backplane Current: 122 mA
• Signal Delay (ON): < 1 ms
• Signal Delay (OFF): 20 ms (±9 ms)
• Max Customer Supply Current: 500 mA per module
• Power Dissipation: 3.3W (max)
• Thermal Dissipation: 11.3 BTU/hr (max)
• Wiring Arm: 1771-WC
• Keying: Pins 34-36 (upper), 4-6 (lower)
• Coating: Protective conformal coat

Power Requirements

• Backplane power from 1771 I/O chassis
• External 5V DC power supply for TTL signals
• User must provide external 5V power source

Compatibility & Applications

• Works with all 1771 I/O chassis
• Perfect for TTL and BCD interface applications
• Ideal for encoder connections and digital sensors
• Supports ½, 1, and 2-slot I/O addressing

Shipping & Warranty

• Includes: 1 x 1771-IG Module, 1 x 1771-WC Wiring Arm
• Shipping: FedEx, UPS, or DHL available
• Warranty: 12 months coverage

Frequently Asked Questions

• Why does this module need two power sources?
  It needs chassis power for operation and external 5V power for TTL signal processing.
• Can I use this module with regular 24V DC signals?
  No, it is designed specifically for 5V TTL signals only.
• What is the conformal coating for?
  It protects the module from moisture, dust, and harsh industrial environments.
• How fast can this module respond to input signals?
  It has an incredibly fast response time of less than 1 millisecond.
• What types of devices connect to this module?
  It works with TTL-compatible devices like encoders, sensors, and digital switches.