The Allen-Bradley 1771-P6S, also cataloged as the 1771-P6S Power Supply Module, operates as a dedicated hardware component for direct bus power conversion and regulation within Allen-Bradley 1771 Universal I/O Chassis systems.
Hardware Specifications
Parameter
Specification
Model
1771-P6S
Brand
Allen-Bradley
Origin
USA
Weight
1.85 lbs
Dimensions
Standard 1771 single-slot chassis module
Operating Temp
0 to 60 deg C
Power Consumption
0.5 A at 220 VAC input
Input Voltage
220 VAC nominal (50/60 Hz)
Output Voltage
5 VDC
Output Current
8 A
Backplane Bus Power Integration and Determinism
The 1771-P6S module provides high-efficiency power distribution across the 1771 backplane bus, supporting reliable I/O density scaling without signal degradation or voltage sag. Internal power routing features integrated firmware flash compatibility logic for monitoring rail status, preventing system brownouts during peak switching loads on connected digital and analog submodules.
Frequently Asked Questions
Q: What is the primary output power provided by the 1771-P6S to the 1771 chassis?
A: The 1771-P6S steps down a nominal 220 VAC input (50/60 Hz, 0.5 A max load) to deliver regulated 5 VDC power at up to 8 A directly to the backplane bus logic circuitry.
Q: Are there specific power supply load calculations required before adding I/O modules?
A: Yes, total 5 VDC current draw from all populated I/O modules on the chassis backplane must not exceed the 8 A output limit of the 1771-P6S module to avoid thermal overload and voltage dropouts.
Field Installation Guidelines
Ensure main AC source power is disconnected before installing or removing the module from the 1771 Universal I/O chassis slot.
Seat the module firmly into its designated chassis slot until the top and bottom card guides lock securely into position.
Wire the 220 VAC input connection to the designated terminal block using properly rated 14 AWG to 12 AWG copper conductors.
Verify that the chassis frame grounding screw is connected to safety ground using a low-impedance conductor to minimize noise coupling and surge interference.
