1756-OF8I | Allen-Bradley ControlLogix Isolated Analog Output Module

Overview

The Allen-Bradley 1756-OF8I is an isolated 8-point analog output module from the ControlLogix series. It provides precise voltage and current outputs for process and motion control applications. Each channel is individually isolated to ensure reliable signal integrity and reduce electrical interference.

Technical Specifications

• Manufacturer: Allen-Bradley

• Product Line: ControlLogix

• Model / Part Number: 1756-OF8I

• Product Type: Isolated Analog Output Module

• Weight: 0.50 lbs (0.23 kg)

• Number of Outputs: 8 isolated channels (current/voltage)

• Output Current Range: 0–20 mA, 4–20 mA

• Output Voltage Range: ±10V, 0–10V, 0–5V

• Resolution: 15–16 bits

• Data Format: IEEE 32-bit floating point

• Conversion Method: R-2R ladder DAC, monotonic with no missing codes

• Open Circuit Detection: Supported (current mode only)

• Short Circuit Detection: Supported (voltage mode only)

• Overvoltage Protection: ±30V DC

• Isolation Voltage: 50V DC continuous

• Current Draw (24V DC): 400 mA

• Power Dissipation: 6.5 W

• Thermal Dissipation: 22.2 BTU/hr

• Terminal Blocks Supported: 1756-TBNH, 1756-TBSH, 1756-TBCH, 1756-TBS6H

• Enclosure Type: Open-style

• Mounting: Chassis-based

Key Features

• Eight fully isolated analog output channels for high signal integrity

• Supports both voltage and current outputs

• High 16-bit resolution for precise control

• Built-in protection against open and short circuits

• ±30V DC overvoltage protection for safety

• Compatible with multiple removable terminal block options

• Suitable for demanding process control applications

Application Scenarios

• Industrial process and motion control systems

• PID loop control in automation

• Control of drives, valves, and actuators

• Precision analog instrumentation

• Distributed I/O systems in ControlLogix environments

FAQs

• Q: What output types are supported?

• A: Voltage (±10V, 0–10V, 0–5V) and current (0–20mA, 4–20mA).

• Q: Are channels isolated?

• A: Yes, each of the eight channels is individually isolated.

• Q: Which terminal blocks can be used?

• A: Compatible blocks include 1756-TBNH, 1756-TBSH, 1756-TBCH, 1756-TBS6H.

• Q: How is overvoltage handled?

• A: The module provides ±30V DC overvoltage protection for both current and voltage outputs.