Allen-Bradley 1771-P6R/C 1771 PLC-5 I/O System Power Supply Module

The Allen-Bradley 1771-P6R/C, also cataloged as the 1771-P6R Redundant Power Supply Module, operates as a dedicated hardware component for converting AC input into regulated 5 VDC backplane power within 1771 PLC-5 I/O System platforms.

Hardware Specifications

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

The 1771-P6R/C supplies an 8 A current threshold to the 5 VDC backplane to secure data integrity across network architectures that utilize Profinet or EtherNet/IP deterministic networks. During periods of maximum I/O density scaling, the demand on the backplane bus communication velocity increases significantly. This module maintains strict voltage regulation under changing system loads, ensuring that the necessary firmware flash compatibility profiles across adjacent communication and processor modules remain stable without inducing power-related logic failures.

Frequently Asked Questions

Q: How do the current capacities scale when combining multiple 1771-P6R/C modules in a redundant architecture?

A: In configured multi-unit setups, a 2-unit system delivers 8 A at 60 deg C, a 3-unit system scales up to 14 A, and a 4-unit system supports up to 20 A of backplane current capacity.

Q: Is hot-swapping permitted for a faulty 1771-P6R/C module inside an active redundant system?

A: No. The backplane architecture requires the local rack or the specific slot power supply source to be isolated and de-energized prior to structural extraction. Removing the unit while under active load hazards introducing transient backplane communication errors.

Q: What cabling is necessary to link the units for true redundant power balancing?

A: Redundant configurations require the dedicated redundancy cable interface (Allen-Bradley Part No. 941201-02) to verify cross-unit electrical balance and fault detection.

Field Installation Guidelines

• Terminal Block Separation: Utilize the removable terminal block assembly for field wiring. Secure all 14 AWG stranded copper power conductors before clicking the terminal assembly into the module face.
• Branch Circuit Protection Constraints: The user must provide external branch circuit protection rated at a maximum of 15 A upstream from the AC input lines.
• Shielding and Grounding Framework: Ensure the 1771 chassis ground terminal is linked to the primary earth ground. Keep power input lines physically isolated from analog measurement cabling to minimize cross-talk.
• Thermal Convection Clearances: Mount the module within its specified 1-slot vertical footprint, ensuring unblocked chassis ventilation pathways to stay within the 47.8 BTU/hr maximum thermal dissipation rating.