Allen-Bradley 1756-OF4 ControlLogix Analog Output Module

Product Description

Configured for analog voltage and current signal output in ControlLogix systems, the Allen-Bradley 1756-OF4 (1756-OF4 Analog Output Module) converts controller output commands into electrical signals for connected field devices. It provides four output channels, with a voltage range of -10 to 10 V and a current range of 4-20 mA. The module occupies one ControlLogix chassis slot and draws power from the backplane.

Hardware Specifications

ControlLogix Backplane and Analog Signal Handling

The 1756-OF4 operates as an analog output component within the ControlLogix chassis. Its four channels provide voltage or current signals for compatible field interfaces, such as actuator command inputs and other analog control circuits.

The module uses the chassis backplane for power and controller communication. Therefore, installation requires verification of the available backplane capacity, module configuration, and channel output mode. The selected output range must match the connected device's electrical input requirements.

The module belongs to the Allen-Bradley ControlLogix platform. Network timing, I/O update behavior, and controller compatibility depend on the installed controller, chassis configuration, communication path, and project configuration. Confirm these details against the applicable Rockwell Automation documentation before commissioning.

Frequently Asked Questions

Q: What analog output signals does the 1756-OF4 support?

A: The supplied specifications list a voltage range of -10 to 10 V and a current range of 4-20 mA. Confirm the channel configuration and wiring requirements in the module manual.

Q: How much backplane power does the module require?

A: The supplied data lists backplane ratings of 150 mA at 5.1 VDC and 210 mA at 24 VDC. It also lists total backplane power as 5.8 W and power consumption as 3.7 W. Verify the applicable figures against the official technical manual before calculating chassis power budgets.

Q: Can the module be installed in any ControlLogix chassis slot?

A: The module occupies one slot, but chassis compatibility and permitted installation procedures must be confirmed using the applicable ControlLogix hardware documentation. Do not assume hot-swap support without checking the manufacturer's instructions.

Field Installation Guidelines

1. Verify chassis compatibility: Confirm the chassis type, controller configuration, and module placement against the applicable ControlLogix documentation.
2. Check backplane capacity: Calculate the chassis power budget using the manufacturer's verified current and power specifications.
3. Inspect field wiring: Match each output channel to the connected device's voltage or current input requirements. Check terminal assignments before energizing the circuit.
4. Separate signal wiring: Route analog signal conductors away from high-current power wiring and sources of electrical interference where practical.
5. Ground cable shields appropriately: Follow the manufacturer's grounding instructions and the plant's electrical design. Avoid creating unintended ground loops.
6. Verify output configuration: Confirm channel ranges, controller tags, scaling, and commanded output values before connecting the module to operating equipment.
7. Perform functional checks: Measure the output signal with suitable test equipment and verify the response at the receiving device before returning the control loop to service.

Other Attributes

• Series: Allen-Bradley ControlLogix
• Country of Origin:  USA
• Lead Time: In Stock, 2 Working Days

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