Allen-Bradley 1756-IV16 ControlLogix Digital DC Input Module

1756-IV16 Allen-Bradley ControlLogix Digital Input Module

Product Introduction

The Allen-Bradley 1756-IV16 is a high-performance digital DC input module designed specifically for the ControlLogix 1756 chassis. This module provides 16 sourcing inputs organized into two isolated groups of eight points each. It accepts a wide operating voltage range of 10 to 30V DC, making it versatile for various 12V and 24V DC field devices. Furthermore, the 1756-IV16 includes user-selectable input filtering to reject noise and prevent false triggers, ensuring accurate and stable signal acquisition in demanding industrial environments.

Technical Specifications

The 1756-IV16 delivers precise and reliable input detection with clearly defined electrical characteristics. Its backplane power consumption is minimal, drawing only 110 mA at 5V DC and 2 mA at 24V DC. Total power dissipation reaches a maximum of 5.41 Watts at 60°C, with a thermal dissipation of 18.47 BTU/hour.

Key Input Characteristics:

• Operating Voltage Range: 10 – 30 Volts DC

• Nominal Voltage: 24 Volts DC (12/24V DC source category)

• Input Current (On-state): 2 mA minimum at 10V DC to 10 mA maximum at 30V DC

• Off-state Current: 1.5 mA maximum

• Off-state Voltage: 5V DC maximum

• Input Impedance: 3.2 kΩ maximum at 30V DC

• Continuous Isolation Voltage: 250 Volts

Input Delay and Filtering Configuration

The Allen-Bradley 1756-IV16 offers flexible input filtering to adapt to various signal conditions. The total input delay time combines a fixed hardware delay with a user-selectable filter time.

Specifically, for an Off-to-On transition, the hardware delay is 280 µs nominal (1 ms maximum), plus the selected filter time of 0 ms, 1 ms, or 2 ms. Meanwhile, for an On-to-Off transition, the hardware delay is 540 µs nominal (2 ms maximum), plus the selected filter time of 1 ms, 2 ms, 9 ms, or 18 ms.

Consequently, users can optimize the module's response speed and noise immunity by choosing the appropriate filter settings for their specific application.

Mechanical and Environmental Specifications

The 1756-IV16 is built to withstand harsh industrial conditions. It operates reliably within a temperature range of 0 to 60°C and can endure vibration and shock typical of factory floor environments. Additionally, the module features a maximum inrush current of 250 mA and a backplane power rating of 0.61 Watts.

Moreover, this module requires a removable terminal block (RTB) for field wiring connections. Compatible RTBs include the 1756-TBSH (screw-type) or the 1756-TBNH (spring-type), both offering secure and convenient wiring solutions. Front-panel LED indicators provide clear visual status for each input point and module health.

Installation Guidelines

Proper installation ensures optimal performance and reliability of the 1756-IV16.

1. Chassis Selection: First, ensure the module is installed in a compatible ControlLogix 1756 chassis with sufficient available slots.

2. RTB Attachment: Next, attach the appropriate RTB (1756-TBSH or 1756-TBNH) to the front of the module before inserting it into the chassis.

3. Module Insertion: Then, insert the module into the chosen slot and secure it by turning the locking screws.

4. Wiring: After that, connect field devices to the RTB terminals, following the wiring diagrams and observing polarity for sourcing inputs.

5. Configuration: Finally, configure the input filter settings in the Logix Designer application to match your application's requirements.

Packaging List

Each shipment of the Allen-Bradley 1756-IV16 includes the following items:

• 1 x Digital DC Input Module

• 1 x Installation Instructions manual
  (Note: Removable Terminal Block is sold separately.)

Frequently Asked Questions (FAQ)

1. What voltage range does the 1756-IV16 input module support?
The Allen-Bradley 1756-IV16 accepts a wide operating voltage range of 10 to 30V DC, with a nominal rating of 24V DC for standard industrial applications.

2. Which removable terminal blocks are compatible with the 1756-IV16?
This module requires either the 1756-TBSH (screw-type) or the 1756-TBNH (spring-type) removable terminal block for field wiring connections.

3. Can I adjust the input filtering on the 1756-IV16?
Yes, the 1756-IV16 provides user-selectable filter times. For Off-to-On transitions, options include 0, 1, or 2 ms. For On-to-Off transitions, options include 1, 2, 9, or 18 ms.

4. How many inputs does the Allen-Bradley 1756-IV16 provide?
This module offers 16 digital DC inputs, which are organized into two isolated groups of 8 points each for flexible configuration.

5. What shipping methods do you offer for the 1756-IV16 module?
We ship this product using trusted global carriers such as FedEx, UPS, and DHL to ensure prompt and secure delivery.