Allen-Bradley | 1756-IA16I | ControlLogix (1756 Series)

Product Description: Allen-Bradley 1756-IA16I

The Allen-Bradley 1756-IA16I is a 16-channel isolated digital input module designed for use in ControlLogix systems. It supports 120V AC nominal input signals and provides channel-to-channel electrical isolation, making it ideal for applications with different voltage domains or requiring enhanced noise immunity. Each channel includes its own optical isolation and status indication, ensuring safe and reliable signal detection in electrically demanding environments.

Key Features

• 16 isolated AC digital input channels
• Supports 79–132V AC input range at 47–63 Hz (120V AC nominal)
• Channel-to-channel isolation for noise immunity and protection
• Per-channel LED indicators for input status
• Built-in diagnostics for under- voltage and signal loss
• Designed for use in industrial applications with mixed-voltage inputs
• Compatible with ControlLogix chassis and standard RTBs (Removable Terminal Blocks)

Technical Specifications

• Input Voltage Range: 79–132V AC
• Frequency: 47–63 Hz
• On-State Voltage: ≥74V AC
• Off-State Voltage: ≤20V AC
• On-State Current: ≥6.0 mA
• Off-State Current: ≤2.0 mA
• Isolation: 250V AC (channel-to-channel and to backplane)
• Input Delay (default): 8.3 ms (1 cycle)
• Backplane Current Draw:
  • 120 mA @ 5.1V DC
• Operating Temperature: 0°C to 60°C
• Mounting: Any slot in a ControlLogix chassis
• Required RTBs: 1756-TBNH, 1756-TBSH, or equivalent 36-position
• Certifications: UL Listed, CE, CSA, RoHS, Class I Div 2

Application Areas

• Electrical panels with multiple independent AC sources
• High-noise industrial environments
• Factory automation using multiple power domains
• OEM machinery with isolated AC signal requirements
• Systems requiring diagnostic visibility and per-channel isolation

Advantages

• Full channel-to-channel isolation enhances system safety
• Compatible with standard 120V AC sensors and switches
• Ideal for noisy environments or separate ground systems
• LED status indicators aid in fast troubleshooting
• Seamless integration with ControlLogix architecture and Studio 5000