PRODUCT INFORMATION
Product Overview
The Allen-Bradley 1771-PA is an external power supply module engineered for the PLC-5 system architecture. It delivers a regulated 5V DC backplane output current of up to 16 Amperes to power one 1771 chassis. The unit supports an AC input voltage range of 97 to 132 Volts AC or 195 to 264 Volts AC. Operating line frequency ranges from 47 to 63 Hertz. It draws a nominal input current of 1.0 Ampere at 120V AC and 0.5 Ampere at 220V AC.
This stand-alone supply operates as an open-type device requiring installation inside a protective industrial enclosure. Users can attach the unit directly to a panel-mounted chassis using provided mounting screws. Alternatively, it can mount separately while maintaining at least 6 inches of vertical clearance. Install the unit only above or alongside the chassis to maintain proper natural convection cooling. Mounting the module below a chassis can impede cooling airflow and cause thermal elevation in both units.
TECHNICAL DATA
Technical Specifications
| Parameter | Specification |
|---|
| Backplane Output Current | 16 Amperes (at 5 Volts DC) |
|---|
| Cabling | 1771-CP1 Local, 1771-CP2 Remote 5 ft, and 1771-CP3 Remote 5 ft |
|---|
| Category | PLCs |
|---|
| Frequency | 47-63 Hertz |
|---|
| Fuse | 3 Amperes, 250 Volts, Normal-Blow |
|---|
| Input Voltage Range | 97-132 or 195-264 Volts AC |
|---|
| Location | Stand-Alone |
|---|
| Max Apparent Input Power | 176 VA |
|---|
| Max Real Input Power | 108 Watts |
|---|
| Max Xformer Load | 270 VA |
|---|
| Module Type | Power Supply |
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| Product Line | PLC 5 |
|---|
| UPC | 10612598003386 |
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| Voltage Rating | 120/220 Volts AC |
|---|
| Weight | 12.31 lbs (5.58 kg) |
|---|
TECHNICAL INFORMATION
Features
- Supplies up to 16 Amperes of direct current at 5 Volts DC to the backplane.
- Accommodates dual nominal AC input selections of 120 Volts AC and 220 Volts AC.
- Accepts AC input frequency variations across 47 to 63 Hertz.
- Incorporates internal circuit protection with a 3 Ampere 250 Volt normal-blow fuse.
- Supports stand-alone mounting or direct chassis attachment via mounting hardware.
- Delivers dedicated power for PLC-5 processors, adapter modules, and Mini-PLC-2 controllers.
TECHNICAL INFORMATION
Applications
- Primary backplane power supply for single Allen-Bradley 1771 I/O chassis assemblies.
- Power distribution for remote or local 1771 rack configurations in industrial control panels.
- Compatible power source for legacy Mini-PLC-2 system installations.
TECHNICAL INFORMATION
Connections / Interfaces
- Connects to the 1771 I/O backplane using 1771-CP1 local power cable assemblies.
- Supports remote chassis power connections using 1771-CP2 or 1771-CP3 5-foot cables.
- Equipped with terminal connections for incoming 120V AC or 220V AC power feeds.
TECHNICAL INFORMATION
Installation Guidelines
- Mount the I/O chassis and set the configuration jumper to the N position before module setup.
- Maintain a minimum vertical clearance of 6 inches when mounting the unit as a separate device.
- Mount the module only above or beside the chassis to preserve proper convection airflow.
- Never mount the unit below the chassis due to thermal convection risks.
- Do not wire 1771-PA power supplies in parallel under any circumstances.
- Touch a grounded metal surface before handling connector pins to prevent electrostatic discharge.
TECHNICAL INFORMATION
Configuration Guidelines
- Verify the chassis power configuration jumper is set to position N for external supply operation.
- Confirm the incoming AC utility supply matches either the 120V or 220V operating range.
TECHNICAL INFORMATION
Compatibility
- Allen-Bradley 1771 I/O chassis lines.
- Allen-Bradley PLC-5 programmable controller modules.
- Allen-Bradley 1771 I/O adapter modules.
- Mini-PLC-2 processor modules including /02, /05, /16, and /17 variants.
TECHNICAL RESOURCES
Documentation
COMPATIBILITY
Compatibility & Replacement
COMPATIBLE MODELSAllen-Bradley 1771 I/O chassis lines. Allen-Bradley PLC-5 programmable controller modules. Allen-Bradley 1771 I/O adapter modules. Mini-PLC-2 processor modules including /02, /05, /16, and /17 variants.
Verify compatibility against the exact Part Number, revision and manufacturer documentation before ordering.
PART VERIFICATION
Before You Order
Industrial automation parts can share similar model names, suffixes and revisions. Confirm the complete manufacturer Part Number before purchase.
01Check Part NumberMatch the complete ordering code on the existing unit.
02Confirm RevisionCheck suffix, hardware or firmware when applicable.
03Send a Label PhotoWe can review a clear label photo when identification is uncertain.
ORDERING PROCESS
From RFQ to Dispatch
1Submit Part Number2Verify Product Identity3Confirm Stock & Condition4Issue Quotation5Dispatch & Tracking
PRODUCT FAQ
Frequently Asked Questions
Can the Allen-Bradley 1771-PA power supply be connected in parallel?
No. The 1771-PA is not designed for parallel connection. Parallel wiring can cause unexpected machine operation, personal injury, or processor memory loss.
What is the backplane output capacity of the 1771-PA?
The 1771-PA provides a regulated backplane output current of 16 Amperes at 5 Volts DC.
Where should the 1771-PA be positioned relative to the 1771 chassis?
Mount the unit above or adjacent to the I/O chassis. Never mount it below the chassis. Mounting below impedes natural convection cooling for both units.
What is the reference price for an Allen-Bradley 1771-PA?
Observed market reference pricing is approximately $128.00 for refurbished surplus units. This figure is an indicative market reference only, not a final quotation. Final quotes depend on condition, warranty, and stock availability.
