Allen-Bradley 1771-P6S B 1771 PLC-5 I/O System Power Supply Module

The Allen-Bradley 1771-P6S B, also cataloged as the 1771-P6S Power Supply Module, operates as a dedicated hardware component for converting AC input into regulated DC backplane power within 1771 PLC-5 I/O System platforms.

Hardware Specifications

Profinet / EtherNet/IP Deterministic Networks and I/O Density Scaling

The 1771-P6S B delivers 8 A of regulated 5 VDC backplane output current to maintain systemic power thresholds during significant I/O density scaling. This auxiliary supply structure is critical when deploying power-intensive communication modules that interface with Profinet or EtherNet/IP deterministic networks. Proper distribution of the 5 VDC rail prevents localized voltage sags across the 1771 chassis slot channels, preserving the operational integrity and execution velocity of the backplane bus.

Frequently Asked Questions

Q: What is the purpose of the 1771-CT cable connection on the 1771-P6S B?

A: The 1771-CT cable is utilized to establish a direct connection between parallelable modules (such as -P6S, -LWP, -LZP, and -LXP) to allow dual-supply configurations within a single 1771 chassis for increased backplane current capacity.

Q: What happens if the nominal AC input voltage drops below the 194 VAC threshold?

A: The module internal monitoring circuitry detects the undervoltage condition and generates a shutdown signal to protect the processor memory integrity from corruption before the backplane voltage collapses.

Q: Is hot-swapping supported for the 1771-P6S B inside a live 1771 chassis?

A: No. The chassis backplane must be fully de-energized prior to removing or inserting the module. Disregarding this rule risks inducing electrostatic discharge damage and memory faults across the active PLC-5 processor.

Field Installation Guidelines

• Chassis Compatibility Constraints: Install the 1771-P6S B module in a standard single I/O slot. For older 1771 chassis designs, review slot location restrictions to ensure mechanical alignment and proper backplane bus integration.
• Paralleling Interconnection: When linking two power supplies in parallel, only use the certified 1771-CT cabling interface. Do not bridge terminal blocks using discrete external jump wires.
• Fuse Replacement Parameters: Replace blown fuses exclusively with 1.5 A, 250 V slow-blow fuses matching the factory specification. Turn off all upstream AC supply power before extracting the fuse holder.
• Electrostatic Discharge Minimization: Maintain standard ESD handling protocols. Keep the component within its static-shielded packaging until the immediate point of physical mounting inside the chassis.