4-Pt Analog Voltage Current Out | 1756-OF4/A Allen Bradley

Allen Bradley 1756-OF4/A ControlLogix 4-Channel Analog Output Module

Product Overview

The 1756-OF4/A (1756-OF4/A) is a versatile analog output module from the Rockwell Automation ControlLogix I/O platform. It is engineered to provide precise control signals for industrial field devices, featuring four non-isolated channels that are individually software-configurable. This module acts as the interface between the controller's digital logic and analog actuators, enabling fine-tuned adjustments for process variables.

Supporting both voltage and current signaling, the 1756-OF4/A is commonly utilized to drive control valves, modulate variable frequency drives (VFDs), and provide setpoints for auxiliary controllers. Its integration into the ControlLogix backplane ensures high-speed data synchronization and comprehensive module-level diagnostics.

Technical Specifications

The 1756-OF4/A is built for high-resolution performance within the ControlLogix environment:

• Manufacturer: Allen-Bradley (Rockwell Automation)

• Model/Catalog Number: 1756-OF4/A

• Module Type: Analog Output (Non-isolated)

• Number of Outputs: 4 Channels

• Output Ranges (Voltage): ±10V, 0…10V, 0…5V

• Output Ranges (Current): 0…20 mA, 4…20 mA

• Resolution: 15 bits across 10.5V (320 μV/bit); 14 bits across 21 mA (1.3 μA/bit)

• Output Settling Time: 2 ms maximum to 0.1% of final value

• Calibration Accuracy: Better than 0.05% of range

• Backplane Current (5.1V DC): 150 mA

• Backplane Current (24V DC): 120 mA

• Power Dissipation: 3.7 W (Voltage); 4.5 W (Current)

• Isolation Voltage: 250V (continuous), tested at 1350V AC for 2 s (between output channels and backplane)

• Data Format: Integer (scaled), Floating Point

• Removable Terminal Block (RTB): 1756-TBNH or 1756-TBSH (20-pin)

• Weight: 0.3 kg (0.77 lb)