1756-IG16 Digital Input Module Allen-Bradley

Allen-Bradley 1756-IG16 TTL Input Module

Technical Specifications

• Brand: Allen-Bradley
• Series: ControlLogix
• Model: 1756-IG16
• Input Channels: 16 TTL points
• Logic Type: Low-true (inverted)
• Voltage Range: 4.5-5.5V DC
• Input Type: TTL source configuration
• Response Time: 0.25ms + filter time
• Input Current: 3.7-4.1 mA nominal
• Power Dissipation: 1.4W maximum
• Backplane Current: 110mA @ 5V DC
• Terminal Blocks: 1756-TBNH, 1756-TBSH

TTL Logic Characteristics

• Low-True Operation: 0-0.8V = ON state
• High-False Operation: 2.0-5.5V = OFF state
• Uncertain Range: 0.8-2.0V = undefined state
• Input Configuration: 8 points per common group
• Signal Quality: Maximum 50mV P-P ripple tolerance
• Current Draw: 4.1mA maximum per input

Performance Timing

• ON Response: 270μs nominal, 450μs maximum
• OFF Response: 390μs nominal, 700μs maximum
• Filter Options: 0, 1, 2ms for ON transitions
• OFF Filters: 0, 1, 2, 9, 18ms selectable
• Total Delay: Hardware delay plus selected filter time

Power Requirements

• Backplane Power: 110mA at 5.1V DC
• 24V DC Current: 2mA from backplane
• Total Consumption: 0.61 Watts backplane power
• Thermal Dissipation: 4.8 BTU/hour maximum
• Efficiency: Low power design for minimal heat

Installation & Wiring

• Slot Width: Single slot module
• Terminal Blocks: 20-pin 1756-TBNH or 1756-TBSH
• Chassis Compatibility: All 1756 ControlLogix systems
• Group Configuration: Two groups of 8 inputs each
• Wiring Scheme: Source configuration with common points

Frequently Asked Questions

What does "low-true" mean for this module?

• The 1756-IG16 recognizes low voltage (0-0.8V) as ON and high voltage (2.0-5.5V) as OFF state.

What voltage range does it support?

• It operates from 4.5 to 5.5 volts DC with TTL-level signals.

How fast is the response time?

• Hardware response is 270μs typical for ON, 390μs for OFF transitions.

What terminal blocks are needed?

• Use 1756-TBNH or 1756-TBSH 20-pin removable terminal blocks.

Can I adjust the response sensitivity?

• Yes, configurable filter times from 0-18ms are available.

How many input groups are there?

• The 16 inputs are divided into two groups of 8 points each.

What is the power consumption?

• Maximum power dissipation is 1.4 watts at 60°C operating temperature.

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