Allen-Bradley 1756-IV16 ControlLogix 16 Pt 12/24V DC D/I Module

Product Summary

The Allen-Bradley 1756-IV16 is a 24VDC Sinking Input Module for the ControlLogix platform. It features 16 individually isolated input points, each capable of sinking current from field devices to the module's common return. The isolated design allows each input to operate on separate power sources or phases without electrical interference, making it ideal for mixed-voltage or distributed I/O applications.

Core Specifications

• Model Number: 1756-IV16
• Type: 24VDC Sinking (Current Sinking) Input Module
• Number of Points: 16 inputs (individually isolated)
• Voltage Category: 24VDC sink
• Operating Voltage: 10–30VDC
• Input Delay Time: 0 ms, 1 ms, or 2 ms (software-selectable)
• Backplane Current: 100 mA at 5.1 VDC; 2 mA at 24 VDC
• Power Dissipation: 1.5 W typical at 60°C
• Manufacturer: Allen-Bradley by Rockwell Automation

Electrical & Functional Characteristics

• On-State Voltage Range: 10–30VDC
• Off-State Voltage Range: 0–5VDC
• On-State Current: 2 mA minimum at 10VDC; 10 mA maximum at 30VDC
• Off-State Current: 1.5 mA maximum
• Isolation: 250V continuous; 1500V transient (field to backplane); 250V channel-to-channel
• Status Indicators: 16 yellow LEDs for input state; 2 green/red LEDs for module and I/O status
• Removable Terminal Block: 1756-TBCH or 1756-TBS6H (sold separately)

System Integration & Compatibility

• Primary Platform: ControlLogix 1756 chassis
• Software: RSLogix 5000 / Studio 5000 Logix Designer
• Configuration: Software-configurable; no physical DIP switches required
• Hot Swap: Supports removal and insertion under power (RIUP) with compatible chassis
• Keying: Electronically keyed to prevent incorrect module insertion
• Related Parts: 1756-IV32 (32-point version), 1756-IB16 (16-point non-isolated), 1756-TBCH (terminal block)

Environmental & Operational Limits

• Operating Temperature: 0°C to 60°C (32°F to 140°F)
• Storage Temperature: -40°C to +85°C (-40°F to 185°F)
• Humidity: 5% to 95% RH, non-condensing
• Vibration: 2G, 10 to 500 Hz
• Shock: 30G, 11 ms
• Approvals: CE, UL, CUL, ATEX (Zone 2), Marine

Industrial Applications

Widely deployed in material handling, packaging, automotive assembly, food & beverage processing, water/wastewater treatment, and general manufacturing where 24VDC sinking inputs from proximity sensors, limit switches, pushbuttons, and photoelectric sensors are required.

Frequently Asked Questions

What is the difference between 1756-IV16 and 1756-IB16?

The 1756-IV16 is a sinking input module (current flows from field device into module). The 1756-IB16 is a sourcing input module (current flows from module into field device). Choose based on your field device wiring configuration.

What does "individually isolated" mean?

Each of the 16 input channels has its own isolation barrier, allowing each input to connect to a separate power source or phase without electrical cross-interference between channels.

What terminal block do I need?

The 1756-TBCH (20-pin cage-clamp) or 1756-TBS6H (20-pin spring-clamp) removable terminal block is required and sold separately.

Can I hot-swap this module?

Yes — the 1756-IV16 supports RIUP (removal and insertion under power) when used in a compatible ControlLogix chassis.

What are the related part numbers?

• 1756-IB16 — 16-point 24VDC sourcing input (non-isolated)
• 1756-IV16 — 16-point 24VDC sinking input, isolated (this part)
• 1756-IV32 — 32-point 24VDC sinking input, isolated
• 1756-TBCH — 20-pin cage-clamp terminal block
• 1756-TBS6H — 20-pin spring-clamp terminal block