Description
Allen-Bradley 1771-IG TTL Digital Input Module for PLC-5 Systems
The 1771-IG from Allen-Bradley/Rockwell Automation is a specialized TTL input module designed for precision digital signal acquisition. This 8-channel module operates exclusively with 5V DC TTL signals, providing ultra-fast response times for critical applications. It serves as an ideal interface between TTL-compatible devices and your PLC-5 control system.
Technical Specifications
- Brand & Model: Allen-Bradley 1771-IG
- Module Type: TTL Digital Input Module
- Input Channels: 8 TTL-Compatible Inputs
- Operating Voltage: 5.0 – 5.3V DC Strict
- Input Current: 500mA Maximum External Supply
- Response Time (On): < 1 Millisecond
- Response Time (Off): 20ms (±9ms)
- Backplane Current: 122mA @ 5V DC
- Power Dissipation: 3.3W Maximum
- Isolation Rating: 1500V Optical Isolation
- Logic Levels: TTL Compatible (0-0.8V Low, 2.0-5.3V High)
- Operating Temperature: 0° to 60°C (32° to 140°F)
- Input Impedance: 3.3K Ohms Typical
- Noise Immunity: 1000V/μs Common Mode Rejection
Installation & Wiring
- Requires 1771 series I/O chassis for installation
- Uses keying bands between pins 34-36 (upper) and 4-6 (lower)
- Includes 1771-WC wiring arm for easy field connections
- Supports ½-slot, 1-slot, and 2-slot I/O addressing
- Needs external 5V DC power supply for TTL signal transmission
- Designed for rack mounting in industrial control panels
Packaging & Shipping
- Includes one 1771-IG module and 1771-WC wiring arm
- Protected industrial packaging ensures safe delivery
- Global shipping via FedEx, UPS, and DHL available
- 12-month comprehensive warranty coverage
Compatible Chassis Solutions
- For system integration, consider the 1771-A3B Universal Chassis
- For expanded capabilities, see the 1771-A3B1 Chassis System
Frequently Asked Questions
- Can this module handle 24V DC signals? No, it exclusively operates with 5V DC TTL-level signals only
- What external power supply specifications are needed? You need a regulated 5V DC supply capable of 500mA minimum
- Is this module suitable for high-speed encoder applications? Yes, its sub-1ms response time makes it ideal for encoder interfaces
- How many modules can I install in one chassis? This depends on your specific 1771 chassis slot capacity
- Does the module provide signal conditioning? Yes, it includes input filtering and optical isolation features
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