The Allen-Bradley 1771-P5E, also cataloged as the 1771P5E Power Supply, operates as a dedicated hardware component for 24 VDC input conversion and 5 VDC logic power distribution within PLC-5 1771 I/O Chassis platforms.

Variant Code & Catalog Cross-Reference

• Primary Catalog Number: 1771-P5E
• Alternative Part Code: 1771P5E
• System Platform: PLC-5 1771 Architecture
• Slot Width: Two (2) Slot Module Space

Physical & Electrical Operating Parameters

Backplane Power Distribution & Firmware Integrity

The 1771-P5E regulates incoming 24 VDC field input to supply a stable 5 VDC bus rail directly across the 1771 chassis backplane. High-efficiency internal conversion minimizes heat generation, preserving backplane bus communication velocity and logic transfer consistency across high-density I/O configurations while maintaining strict firmware flash compatibility across attached PLC-5 system modules.

Package Dispatch Items

• 1 x 1771-P5E Chassis-Mount Power Supply Module
• 1 x Set of Chassis Slot Keying Bands

Cabinet Installation & Power Wiring Rules

• Chassis Power Isolation: Disconnect main power sources before inserting or seating the 1771-P5E unit into the 1771 I/O chassis.
• Terminal Polarity: Verify 24 VDC positive (+24V) and negative (DC COM) input conductor polarities prior to energizing the supply line.
• Earth Grounding: Secure a low-impedance ground wire from the power supply chassis terminal directly to the enclosure central ground bus bar.

Frequently Asked Questions

• Q: What is the main voltage conversion ratio of the 1771-P5E?

  The supply accepts a 24 VDC input at up to 3 A and steps it down to a regulated 5 VDC output supplying up to 8 A.

• Q: How many chassis slots does the 1771-P5E occupy?

  The module physically occupies two (2) adjacent slots within a standard 1771 I/O rack.

• Q: Is hot-swapping permitted for the 1771-P5E power supply?

  No, input power must be completely isolated prior to insertion or removal to prevent backplane bus damage.

• Q: What is the maximum continuous current rating for the 5 VDC output rail?

  The unit supplies a continuous maximum current of 8 A to the 1771 backplane 5 VDC logic bus.

• Q: How does the 1771-P5E interface with the PLC-5 chassis backplane?

  It seats directly onto the 1771 backplane bus connectors, routing regulated 5 VDC directly to adjacent processor and I/O cards.

• Q: What wire size is recommended for the 24 VDC input wiring connections?

  Use standard copper conductors rated for industrial field wiring, typically 14 AWG to 16 AWG, anchored firmly into the terminal block.

• Q: What operating temperature limits apply to this power supply module?

  The 1771-P5E operates within a standard ambient temperature envelope of 0 to 60 deg C inside the enclosure.

• Q: Does the 1771-P5E provide field power for external sensors?

  No, the 8 A output is dedicated exclusively to powering internal backplane logic circuitry within the 1771 chassis.