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Description
Technical Specifications
| Product Model | 1769-PA2 |
|---|---|
| Manufacturer | Rockwell Automation / Allen‑Bradley |
| Product Type | 1769 Compact I/O Chassis Power Supply Module (AC Input) |
| Input Voltage | 85–265 VAC, 47–63 Hz (universal range) |
| Input Current (Typical) | 0.6 A @ 120 VAC; 0.35 A @ 230 VAC |
| Backplane Output | 5 VDC ±1%, 2.0 A maximum (10 W) |
| Auxiliary Sensor Output | 24 VDC ±5%, 0.8 A maximum (19.2 W) |
| Total Output Power | Approx. 29.2 W |
| Isolation (Input to Output/Ground) | 2596 VDC for 1 s; reinforced insulation per IEC 61131‑2 |
| Protection Features | Over‑current, short‑circuit (auto‑recover), reverse polarity on 24 V out |
| Indicator | Green PWR LED (illuminates when 5 V & 24 V outputs are within specification) |
| Slot Requirement | Must be installed in Slot 0 (leftmost position) of each powered 1769 chassis |
| Maximum Modules Powered | Dependent on total backplane current draw; typically supports full 1769 rack with moderate I/O mix (verify per module current draw) |
| Operating Temperature | 0 °C to 60 °C (32 °F to 140 °F) |
| Storage Temperature | –40 °C to 85 °C |
| Humidity | 5% to 95% non‑condensing |
| Mounting | 35 mm DIN rail (EN 50022) or panel mount with #6 or M3.5 screws |
| Dimensions (H×W×D) | Approx. 70 × 35 × 87 mm (2.76 × 1.38 × 3.43 in) |
| Wire Size (AC Input) | 14–22 AWG (solid or stranded, stripped 7 mm) |
| Wire Size (24 V Sensor Out / COM) | 14–22 AWG |
| Certifications | UL listed, cUL, CE, C‑Tick, Class I Division 2 Groups A,B,C,D (hazardous locations), RoHS |
Main Features and Advantages
Dual‑output convenience with sensor power: Beyond supplying the 5 VDC backplane current required by 1769 modules, the 1769‑PA2 provides a regulated 24 VDC @ 0.8 A auxiliary output labeled “24V” and “COM” on the top terminal block. This allows direct connection of low‑power field devices—such as PNP proximity switches, photoelectric sensors, or small pilot lights—without installing a separate 24 VDC DIN‑rail power supply in the enclosure, reducing panel space, wiring, and component cost on compact machines.Universal AC input for global applicability: The 85–265 VAC input range with 47–63 Hz tolerance means the 1769‑PA2 can be connected to virtually any single‑phase mains supply worldwide—120 VAC in North America, 230 VAC in Europe/Asia—with no voltage‑select jumpers or switch settings to adjust. This simplifies spare‑parts inventory for OEMs shipping machinery to multiple regions and prevents damage from incorrect jumper positioning.Reinforced isolation and robust protection: Input to output isolation is rated to 2596 VDC for 1 second with reinforced insulation meeting IEC 61131‑2 and UL 508requirements, protecting the low‑voltage control system from transients and ground faults on the AC side. The 1769‑PA2 incorporates current‑limiting and short‑circuit protection on both DC outputs; in the event of an overload the unit reduces output and automatically recovers when the fault condition clears, avoiding nuisance fuse replacement.Simple installation with clear status indication: Occupying a single 1769 slot at the left end of the rack, the 1769‑PA2 connects via standard screw terminals for AC line/neutral/ground and for the 24 V sensor output. A single green PWR LED provides at‑a‑glance confirmation that the module’s DC outputs are active and within regulation. Because the supply is transparent to the control program, the only design consideration is ensuring the sum of all 1769 module backplane currents (5 V) does not exceed the 2.0 A rating—a calculation assisted by Rockwell’s I/O module selection tools and reflected in the project’s I/O configuration warning if exceeded.Compatibility across 1769 platforms: The 1769‑PA2 powers both CompactLogix 1769‑L3x controller racks and MicroLogix 1500 1769 expansion chassis, as well as standalone 1769 I/O banks driven by a 1769‑ADN DeviceNet adapter, 1769‑AENT EtherNet/IP adapter, or 1769‑ARM remote I/O adapter. This makes the 1769‑PA2 the standard power solution for virtually any localized cluster of 1769 I/O, whether part of a main machine control panel or a remote IP67‑rated junction box with 1769 expansion.
Application Field
The 1769‑PA2 is specified wherever a 1769 Compact I/O rack—local or remote—requires a self‑contained power source. In packaging machinery with a CompactLogix 1769‑L33ERM or similar CPU, the 1769‑PA2 powers the processor, digital/analog I/O modules, and motion or communications modules in the main enclosure, while its 24 V sensor output feeds the machine’s NPN/PNP sensors. Distributed I/O stations on conveyor systems, bottling lines, or palletizers that use a 1769‑AENT EtherNet/IP adapter with several 1769 input and output modules also require a 1769‑PA2 in the expansion chassis to drive the backplane locally rather than attempting to back‑feed power from the main panel.Water/wastewater pump stations, HVAC control sub‑panels, and skid‑mounted process units frequently employ the 1769‑PA2 to power a small cluster of analog input modules (for level, pressure, or temperature) and discrete I/O controlling pumps, valves, or dampers—especially when the panel already has readily available 120/230 VAC service but lacks a separate 24 VDC supply. Retrofit projects upgrading older SLC 500 or PLC‑5 Mini‑PLC panels to CompactLogix often reuse the existing AC branch circuit to feed a new 1769‑PA2, minimizing rewiring while gaining modern I/O capabilities.Because each independently powered 1769 chassis must begin with its own supply, machines with multiple I/O groupings—such as a main control cabinet plus one or two remote operator stations or zone‑based I/O boxes—will incorporate more than one 1769‑PA2, one per chassis. Its combination of compact size, global AC input, and built‑in 24 V sensor power makes the Allen‑Bradley 1769‑PA2 the default choice for cost‑conscious, space‑efficient 1769 system power across a very broad range of industrial automation applications.
Related Products
- 1769‑PB2 — 24 VDC input version of the 1769 chassis power supply; same 5 V @ 2 A + 24 V @ 0.8 A outputs but accepts 18–30 VDC nominal input instead of AC—used when panel DC supply is already available.
- 1769‑PA4 — Higher‑capacity AC input power supply for 1769 chassis; provides 5 VDC @ 4.0 A backplane current for systems with heavy module loading (e.g., multiple analog, motion, or communications modules). No 24 V sensor output.
- 1769‑PB4 — Higher‑capacity DC input power supply; 24 VDC input, 5 VDC @ 4.0 A backplane output. Used in large 1769 racks powered from a central 24 VDC bulk supply.
- 1769‑L33ERM / 1769‑L36ERM — Example CompactLogix 1769 controllers typically installed to the right of the 1769‑PA2 in the main processor rack.
- 1769‑AENT — EtherNet/IP adapter module for remote 1769 I/O banks; the remote chassis would be powered by its own 1769‑PA2.
- 1769‑ADN — DeviceNet adapter for remote 1769 expansion I/O; also requires a local 1769‑PA2 in the expansion chassis.
- 1769‑ECR — Right‑end cap / bus terminator required at the farthest right position of any powered 1769 I/O rack.
- 1769‑IF4 / 1769‑OW16 — Example 1769 analog input and relay output modules that draw from the backplane current budget supplied by the 1769‑PA2.
