Allen-Bradley 1771-IGD TTL Input Module for PLC-5 Systems

Core Technical Specifications

• Manufacturer: Rockwell Automation / Allen-Bradley
• Model Number: 1771-IGD
• Module Type: TTL Input Module
• Input Channels: 16 TTL-Compatible Inputs
• Operating Voltage: 5.0-5.3 Volts DC
• Backplane Current: 130 mA @ 5V DC
• Logic Selection: Positive and Negative Logic (Selectable)
• Signal Delay: Less than 1 millisecond

Electrical Characteristics & Performance

• Positive Logic: ON state 2.0-5.25V DC, OFF state -0.2 to 0.8V DC
• Negative Logic: ON state -0.2 to 0.8V DC, OFF state 2.0-5.25V DC
• Input current sink requirement: Maximum 7 mA source per input
• Isolation voltage rating: 1500V AC RMS for 1 second
• Power dissipation ranges from 0.4 Watts to 2.7 Watts maximum
• Thermal dissipation: 1.4 BTU/hr minimum to 9.2 BTU/hr maximum

Environmental & Physical Specifications

• Operating temperature range: 0°C to 60°C (32°F to 140°F)
• Storage temperature range: -40°C to 85°C (-40°F to 185°F)
• Relative humidity tolerance: 5% to 95% non-condensing
• Vibration resistance: 2.5 G from 10-500 Hz in all axes
• Shock withstand: 15 G operational, 30 G non-operational
• EMC immunity: Withstands industrial electromagnetic interference

Installation & Configuration

• The 1771-IGD module requires the 1771-WH wiring arm for installation.
• Compatible with Series A/B 1771-A1B, A2B, A3B, A3B1, A4B chassis.
• Also works with 1771-AM1 and 1771-AM2 I/O chassis systems.
• Use 14 AWG stranded copper wire with 60°C insulation rating.
• Apply terminal torque of 1.0 Newton-meter (9 lb-inch) for secure connections.
• Select logic mode via jumper setting on the module front panel.

Diagnostic Features & Protection

• 18 LED status indicators provide real-time input state monitoring.
• Separate positive logic indicator and module active status LED.
• Integrated 0.5A 250V fuse protects against power surges.
• Input terminal protection prevents damage from voltage accidents.
• Conformal coating protects against moisture and contaminants.

Packaging & Shipping Details

• Your order includes one genuine Allen-Bradley 1771-IGD TTL Input Module.
• We provide comprehensive documentation and installation guidelines.
• We ship globally via FedEx, UPS, and DHL express services.
• You receive complete tracking information upon order shipment.

Frequently Asked Questions (FAQ)

• What is the difference between positive and negative logic selection?
• Positive logic treats higher voltage as ON, while negative logic treats lower voltage as ON for reverse operation.
• What types of devices typically connect to this TTL input module?
• It interfaces with TTL-compatible sensors, switches, and digital output devices from various manufacturers.
• How do I change the logic level setting on this module?
• You must physically adjust the jumper setting on the module front panel while power is disconnected.
• What protection features does this input module include?
• The module features 1500V isolation, surge protection fuse, and input terminal voltage protection.
• Can this module operate in high-vibration industrial environments?
• Yes, it withstands 2.5G vibration and 15G operational shock for robust industrial applications.

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