Product Overview
The Allen-Bradley 1756-IV16 is a digital sourcing I/O module engineered for the ControlLogix platform. With 16 inputs organized into two groups of eight points, this module provides reliable signal acquisition for a wide range of industrial applications. It operates on 10–30 Volts DC, with a nominal input voltage of 24 Volts DC, making it compatible with standard 24 VDC sensor and switch circuits.
Designed for direct mounting in a ControlLogix 1756 chassis, the 1756-IV16 requires a removable terminal block (RTB) such as the 1756-TBSH or 1756-TBNH. It supports only input data format, ensuring straightforward integration into existing control systems.
Technical Specifications
Key performance parameters of the Allen-Bradley 1756-IV16 are summarized below:
| Parameter |
Value |
| Manufacturer |
Rockwell Automation |
| Brand |
Allen-Bradley |
| Part Number |
1756-IV16 |
| Series |
ControlLogix |
| Module Type |
Digital DC Input Module |
| Number of Inputs |
16 (2 groups of 8) |
| Input Voltage (Nominal) |
24 Volts DC |
| Operating Voltage Range |
10–30 Volts DC |
| Input Delay Time |
2 ms + selected filter time |
| Minimum Operating Current |
2 mA at 10 VDC |
| Maximum Operating Current |
10 mA at 30 VDC |
| Maximum Off-State Current |
1.5 mA |
| Maximum Power Dissipation |
5.41 W at 60 °C |
| Backplane Current at 5 V |
110 mA |
| Backplane Current at 24 V |
2 mA |
| Total Backplane Power |
0.61 W |
| Maximum Inrush Current |
250 mA |
| Maximum Input Impedance |
3.2 kΩ at 30 VDC |
| Thermal Dissipation |
18.47 BTU/hour |
| Continuous Isolation Voltage |
250 V |
Industry Applications
The Allen-Bradley 1756-IV16 is well-suited for discrete automation tasks, including:
- Monitoring limit switches and proximity sensors in material handling systems.
- Reading pushbutton and selector switch states on control panels.
- Interfacing with relay outputs from safety interlocks in packaging machinery.
Its fast input response, with nominal off-to-on delay of 280 µs plus filter time, ensures precise event capture in high-speed production lines.
Installation & Setup
Before installing the 1756-IV16, ensure the ControlLogix chassis is powered down. Slide the module into an available slot until it locks. Attach a compatible RTB (1756-TBSH or 1756-TBNH) to the module front. Wire field devices to the terminal block following the pinout diagram. Configure the module in the ControlLogix I/O tree using RSLogix 5000 or Studio 5000, selecting the correct input filter times based on your application's noise environment.
Maintenance & Reliability
Routine inspection of the 1756-IV16 should include checking for loose terminal connections and verifying that the RTB is securely fastened. Keep the module free from dust and moisture, as these can affect input impedance and isolation. With a maximum power dissipation of 5.41 W at 60 °C, ensure adequate ventilation within the enclosure to prevent overheating.
Compatibility & Integration
The 1756-IV16 is part of the ControlLogix family and works with any 1756 chassis. It communicates with the controller via the backplane, requiring no additional network configuration. The module is compatible with all ControlLogix processors, including L6x, L7x, and L8x series.
Selection Guide
When ordering the Allen-Bradley 1756-IV16, confirm your chassis slot availability and RTB type. Verify that your system's DC supply matches the 10–30 VDC operating range. For reliable sourcing and fast delivery, PLC Source PRO offers genuine automation spares with global shipping.