The Allen-Bradley 1771-PS7/A, also cataloged as the 1771-PS7 Power Supply Module, operates as a dedicated hardware component for supplying regulated power to PLC-5 I/O chassis assemblies within the Allen-Bradley PLC-5 control platform.

Model Identification

The 1771-PS7 series includes hardware revisions identified by the suffix designations. The base catalog number remains 1771-PS7 for the power supply module family.

• 1771-PS7: Base Power Supply Module
• 1771-PS7/A: Revision A hardware version
• 1771-PS7/B: Revision B hardware version
• 1771-PS7/C: Revision C hardware version

Hardware Specifications

Industrial Control Platform Integration

The 1771-PS7 power supply module provides chassis power conversion for PLC-5 rack assemblies. The module interfaces with the PLC backplane to distribute operating power to installed processor, communication, and I/O modules.

For Allen-Bradley PLC systems, power architecture depends on correct chassis loading calculations, module current requirements, and proper backplane distribution. The power supply module must be installed according to the selected PLC-5 chassis configuration and electrical load specifications.

Ordering Information

• 1 x Allen-Bradley 1771-PS7 Power Supply Module
• 1 x Installed hardware assembly with selected revision (A/B/C when applicable)
• 1 x Product identification label
• Compatible PLC-5 chassis accessories are ordered separately

Field Installation Guidelines

Mounting and Wiring

• Install the module in the designated PLC-5 chassis power supply position.
• Verify the AC input voltage matches the module rating before energizing.
• Connect protective grounding according to industrial control panel wiring practices.
• Keep AC power wiring separated from low-level signal wiring to reduce electrical interference.
• Confirm chassis power loading before adding or replacing PLC-5 modules.
• Inspect terminal connections for proper mechanical tightness during installation.

Frequently Asked Questions

• What input voltage does the 1771-PS7 support?

  The module accepts 120/220 VAC input power with a 50/60 Hz operating frequency as specified for the PLC-5 power supply configuration.

• Is the 1771-PS7 compatible with PLC-5 chassis systems?

  Yes. The 1771-PS7 is designed as a PLC-5 Series chassis power supply module for Allen-Bradley 1771 architecture.

• Can the 1771-PS7 be hot-swapped?

  The module should not be removed or installed under energized conditions. Power must be disconnected before replacement.

• What is the rated output capability of the 1771-PS7?

  The power supply module provides a 2.4 A current rating for supplying connected PLC-5 chassis components.

• Does the 1771-PS7 require external communication wiring?

  No. The module provides electrical power distribution and does not perform network communication functions.

• What installation factors affect module operation?

  Correct input voltage, chassis loading, grounding, and proper cabinet wiring practices affect operating performance.

• Is the 1771-PS7 firmware upgradeable?

  The module is a hardware power supply component and does not contain user-upgradeable control firmware.

• Can the 1771-PS7 replace other PLC-5 power supplies?

  Replacement selection must match chassis requirements, voltage configuration, and electrical load specifications.