Product Overview

The Allen-Bradley 1756-IV16 is a high-density digital sourcing input module engineered for the ControlLogix platform. This module facilitates the interface between field-side digital devices and the 1756 chassis, providing 16 distinct input points organized into two isolated groups of eight. As a sourcing input module, it detects current flowing from the input device to the module, making it ideal for specific wiring configurations in industrial automation environments.

Designed for reliability within the GuardLogix and ControlLogix ecosystems, the 1756-IV16 features user-configurable digital filter times to minimize electrical noise interference and ensure signal integrity. The module requires a Removable Terminal Block (RTB)—specifically the 1756-TBNH or 1756-TBSH—to establish secure field-side connections.

Technical Specifications

• Input Channels: 16 Points (8 points per group)

• Voltage Category: 12/24V DC Sourcing

• Operating Voltage Range: 10–30V DC

• Nominal Input Voltage: 24V DC

• Backplane Current Draw: 165 mA at 5.1V DC; 2 mA at 24V DC

• Total Backplane Power: 0.61 W

• Maximum Power Dissipation: 5.1 W at 60°C

• Thermal Dissipation: 18.47 BTU/hr

• Off-State Voltage (Max): 5V DC

• Off-State Current (Max): 1.5 mA

• On-State Current (Min): 2 mA at 10V DC

• On-State Current (Max): 10 mA at 30V DC

• Input Impedance (Max): 3.2 kΩ at 30V DC

• Inrush Current: 250 mA

• Continuous Isolation Voltage: 250V (Basic Insulation Type)

Signal Delay Characteristics

The 1756-IV16 offers adjustable hardware and software filtering to optimize response times based on application requirements:

• Off to On Delay: Hardware delay of 280 µs (nominal) / 1 ms (max) plus user-selectable filter times of 0 ms, 1 ms, or 2 ms.

• On to Off Delay: Hardware delay of 540 µs (nominal) / 2 ms (max) plus user-selectable filter times of 1 ms, 2 ms, 9 ms, or 18 ms.

Installation and Compliance

This module is designed for mounting in any slot of a 1756 ControlLogix chassis. It features an open-style enclosure and is rated for operation in temperatures ranging from 0°C to 60°C (32°F to 140°F). Its compact form factor (14.5 x 13.2 x 3.3 cm) and lightweight design (0.2 kg) allow for efficient use of cabinet space in complex PLC architectures.