Allen-Bradley 1756-IV32 ControlLogix DC Input Module 32-Point
Introduction:
The Allen‑Bradley 1756‑IV32 is a 32-point sourcing DC input module for the ControlLogix platform, operating at 10‑30V DC (nominal 12/24V). It features configurable input filtering (0–18 ms), low backplane draw (120 mA @5V), and max power dissipation of 4.1W. Compatible with 1756‑TBCH or 1756‑TBS6H RTBs, it supports PNP sensors with excellent noise immunity. Ideal for discrete monitoring in industrial automation, this 1756‑IV32 module ensures reliable performance across 0–60°C environments. Package includes the module and dust cover (RTB sold separately). Shipping via FedEx, UPS, DHL.
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Product Overview
The Allen‑Bradley 1756‑IV32 is a high‑density Digital DC Sourcing Input Module designed for the Rockwell Automation ControlLogix platform. This 32‑point module accepts field devices operating from 10‑30 Volts DC (nominal 12/24V DC), making it an ideal choice for monitoring discrete sensors, pushbuttons, and proximity switches in demanding industrial environments. As part of the ControlLogix family, the 1756‑IV32 integrates seamlessly into the 1756 chassis, delivering reliable performance with configurable input filtering to match your application’s noise immunity and response time requirements. Whether you are upgrading an existing system or building a new automation line, this module offers the flexibility and robustness that Allen‑Bradley is known for.
Technical Specifications
| Parameter | Specification |
|---|---|
| Number of Inputs | 32 (16 points per group) |
| Nominal Input Voltage | 12‑24V DC |
| Operating Voltage Range | 10‑30V DC |
| On‑State Current (Min/Max) | 2 mA at 10V DC / 3.5 mA at 30V DC |
| Off‑State Leakage Current | ≤ 1.5 mA |
| Input Impedance | 8.6 kΩ (max) at 30V DC |
| Backplane Current Draw | 120 mA at 5V DC; 2 mA at 24V DC |
| Power Dissipation (Max) | 4.1 W at 60°C |
| Thermal Dissipation | 14 BTU/hr at 60°C |
| Inrush Current | 250 mA (decays to <37% in 22 ms) |
| Isolation Voltage | 250V continuous |
| Removable Terminal Blocks | 1756‑TBCH or 1756‑TBS6H (ordered separately) |
Input Delay & Filtering
The 1756‑IV32 provides user‑configurable input filter times to reject electrical noise and contact bounce. The total delay is the sum of hardware delay plus the selected filter time:
ON → OFF Transition: Hardware delay (nom. 540 µs – max 2 ms) + filter time (selectable 0, 1, 2, 9, or 18 ms).
OFF → ON Transition: Hardware delay (nom. 350 µs – max 1 ms) + filter time (selectable 0, 1, or 2 ms).
This flexibility allows you to optimize the 1756‑IV32 for fast‑response applications or for stable operation in electrically noisy plants.
Environmental & Mechanical Ratings
Operating Temperature: 0°C to 60°C (32°F to 140°F)
Storage Temperature: -40°C to 85°C (-40°F to 185°F)
Relative Humidity: 5% to 95% (non‑condensing)
Shock & Vibration: Tested to IEC 60068‑2‑27 and IEC 60068‑2‑6 standards, ensuring excellent environmental tolerance and interference immunity for factory floor installations.
Installation Guidelines
Compatible Chassis: The 1756‑IV32 fits any standard ControlLogix 1756 chassis. Ensure the backplane connectors are clean and aligned.
RTB Selection: Use only the 1756‑TBCH (screw‑type) or 1756‑TBS6H (spring‑clamp) removable terminal blocks. Other RTBs are not mechanically compatible.
Wiring: Connect field devices to the 36‑pin RTB using copper wire (0.25 – 2.5 mm² / 22‑14 AWG). Strip length: 7 mm. Tighten screws to 0.56 N·m (5 lb‑in).
Module Installation: Insert the module into the slot with the chassis power OFF. Secure the locking latch to ensure proper backplane connection.
Configuration: Use RSLogix 5000 / Studio 5000 to configure the filter time and assign input tags. The module automatically identifies itself to the controller upon power‑up.
Package Contents (Accessories & Hardware Only)
1 x Allen‑Bradley 1756‑IV32 ControlLogix Input Module
1 x Product information sheet (quick start guide)
1 x Dust cover for the front face
Mounting latch assembly (pre‑installed)
Note: Removable Terminal Block (RTB) is not included and must be ordered separately (1756‑TBCH or 1756‑TBS6H).
3–5 Common FAQs
Q1: What is the difference between sourcing and sinking, and which one is the 1756‑IV32?
The 1756‑IV32 is a sourcing (current‑sourcing) input module. This means the field device provides the voltage source to the input terminal, and the module sinks current to the common (return) side. It is designed for use with PNP‑type sensors and devices.
Q2: Can I use the 1756‑IV32 with a 5V DC sensor?
No. The specified operating voltage range is 10‑30V DC. At 5V, the on‑state current will be insufficient (below the minimum 2 mA at 10V), causing the module to not detect the input reliably. Use a 12V or 24V DC source instead.
Q3: How do I change the input filter time on the 1756‑IV32?
You configure the filter time via the module properties dialog in RSLogix 5000 / Studio 5000 software. Select the desired filter value (0, 1, 2, 9, or 18 ms) per input group. No hardware jumpers or DIP switches are used.
Q4: What does "32‑point with 16 points per group" mean?
The 1756‑IV32 has 32 physical input terminals, organized into two isolated groups of 16 inputs each. Each group shares a common return terminal, allowing you to apply different voltage references or isolate sections of your control system if needed.
Q5: Is the 1756‑IV32 compatible with the newer 1756‑ENBT or 1756‑L8x controllers?
Yes. This module is fully compatible with all ControlLogix controllers, including the 1756‑L7x and 1756‑L8x series, as long as they are in a 1756‑A series chassis and the firmware revision supports digital I/O modules (RSLogix 5000 v13 or higher is recommended).