The Allen-Bradley 1771-P2, also cataloged as the 1771-P2 Power Supply Module, operates as a dedicated hardware component for direct bus power conversion and regulation within Allen-Bradley 1771 Universal I/O Chassis platforms.
Hardware Specifications
Parameter
Specification
Model
1771-P2
Brand
Allen-Bradley
Origin
USA
Weight
10.01 lbs
Dimensions
Standard 1771 chassis power supply slot
Operating Temp
0 to 60 deg C
Power Consumption
1.0 A at 120 VAC / 0.5 A at 240 VAC
Input Voltage
120 VAC / 240 VAC selectable (50/60 Hz)
Output Voltage
5.1 VDC
Output Current
6.5 A
Backplane Bus Communication and Power Stabilization
The 1771-P2 provides steady, regulated power across the 1771 backplane bus structure to maintain bus communication velocity and logic timing integrity across attached I/O modules. The internal power conversion stages ensure output voltage stability under dynamic switching loads, preserving backplane signal levels and preventing voltage ripple from impacting high-density I/O communication cards.
Frequently Asked Questions
Q: What are the input voltage range options for the 1771-P2 power supply module?
A: The 1771-P2 module accepts a nominal dual AC input of either 120 VAC (1.0 A max) or 240 VAC (0.5 A max) at 50/60 Hz, delivering regulated 5.1 VDC output logic power.
Q: What is the maximum current rating provided to the backplane bus by the 1771-P2?
A: The module supplies up to 6.5 A at 5.1 VDC to the 1771 backplane logic rail. Total current consumption from all populated modules in the chassis must remain within this 6.5 A threshold.
Field Installation Guidelines
Verify that incoming mains power is fully de-energized before inserting or removing the power supply module from the 1771 chassis slot.
Confirm that the input voltage jumper or terminal configuration correctly matches the field supply level (120 VAC or 240 VAC) prior to applying power.
Securely mount the module into the chassis card guide until the retaining latch fully engages with the frame assembly.
Route AC power wiring through appropriate strain reliefs and connect the protective earth terminal to a low-impedance ground bus.
