OVERVIEW

Official designation: Allen-Bradley 1775-P1 (PLC-3, Power Supply Module)

Role/Application: The 1775-P1 module supplies the required 5 V DC and 15 V DC power to the processor and I/O modules within the legacy PLC-3 automation system chassis.

KEY SPECS SUMMARY

Power: Input 120/220 V AC, 47-63 Hz

Interfaces / Ports: Chassis backplane, power input terminal

Indicators: None; status monitored via system

Operating Temp: 0 to 60 degrees C

Platform / Compatibility: PLC-3 system, 1771 I/O chassis

Limit: Output 6 A at 5 V DC, 3 A at 15 V DC

Lifecycle: Discontinued/Obsolete

FREQUENTLY ASKED QUESTIONS

Technical Specifications:

Q: What are the primary DC output voltages and their respective maximum current capacities for the 1775-P1?

A: The 1775-P1 provides 5 V DC at 6 A and 15 V DC at 3 A to the chassis backplane.

Wiring & Installation:

Q: What is the maximum number of chassis a single 1775-P1 power supply module can support in a PLC-3 system?

A: One 1775-P1 can deliver sufficient current for a maximum of two full system chassis.

Troubleshooting & Compatibility:

Q: What precautions are necessary for adjacent modules to prevent thermal overload when using the 1775-P1?

A: Limit the adjacent slot power dissipation to a maximum of 10 watts to ensure reliable operation.

Replacement & Upgrades:

Q: What is the current recommended Allen-Bradley platform to replace the functionality of the obsolete PLC-3 system including the 1775-P1?

A: The primary long-term migration path is conversion from the PLC-3 platform to the modern ControlLogix platform.