Product Overview

The Allen-Bradley 1794-PS13​ is a high-capacity externally powered 24 V DC input, 5 V DC logic output power supply module that belongs to Rockwell Automation’s 1794 FLEX I/O product family. It is designed to provide the regulated 5 V DC backplane (flexbus) power required by FLEX I/O modules—digital, analog, specialty, and communication—when the connected adapter or PLC cannot supply sufficient current or when the system is configured as a standalone 1794 rack with a remote adapter that relies on external bus power. The Allen-Bradley 1794-PS13​ accepts a nominal 24 V DC input (operating range 19.2–31.2 V DC) from a customer-supplied external DC supply and converts it to a tightly regulated 5 V DC at up to 8.5 A, enough to power up to sixteen typical 1794 I/O modules (actual capacity depends on the sum of each module’s 5 V backplane current draw).Physically, the Allen-Bradley 1794-PS13​ occupies one slot in a 1794 FLEX I/O rack (1794-TB3, 1794-TB2, etc.) and mounts on standard 35 mm DIN rail. It connects to the FLEX bus via the rack’s tongue-and-groove backplane, distributing logic power to all modules in the assembly. Front-panel LEDs indicate input power presence (24V IN), valid 5V output (5V OUT/OK), and fault conditions such as input undervoltage or output overload. The module includes electronic protection against output overcurrent and short-circuit, as well as input reverse-polarity protection. Because the Allen-Bradley 1794-PS13​ is powered from the machine’s 24 V DC control supply rather than AC mains, it is especially well suited to panel designs that already standardize on 24 V DC, to international machinery bound for regions without a consistent AC mains type, and to applications where the adapter (e.g., 1794-ACN15, 1794-AENTR) does not provide adequate FLEX bus current for the intended I/O complement. The Allen-Bradley 1794-PS13​ thus ensures deterministic module operation, proper signal integrity, and system stability across distributed I/O architectures in packaging lines, process skids, material handling, and machine-building applications.

Technical Specifications

Product Model | 1794-PS13 (also 1794-PS13/A, 1794-PS13/B)Manufacturer | Allen-Bradley / Rockwell AutomationProduct Type | FLEX I/O External 24 V DC Input / 5 V DC Logic Bus Power Supply ModuleInput Voltage Range | 19.2 … 31.2 V DC (nominal 24 V DC)Input Current (max @ 24 V DC, full load) | Approx. 2.8 A @ 24 V DC (depends on output load)Output Voltage | 5.0 V DC ±2 %Output Current (continuous) | 8.5 A max @ 5 V DC (at 60 °C ambient)Output Power (max) | 42.5 WBackplane Bus Current Supplied | 8.5 A @ 5 V DC to FLEX I/O rack busInput Reverse Polarity Protection | YesOutput Overcurrent / Short-Circuit Protection | Yes (hiccup mode with auto-recovery)Isolation (Input to Output/Backplane) | 500 V DC continuous; 1500 V AC for 1 s testIndicators | PWR IN (green), 5V OK (green), FLT (red/amber as applicable per revision)Module Keying | Set via 1794-Kx keying bands compatible with FLEX I/O rackMounting | 35 mm DIN rail (EN 50022) or panel mount via 1794 rack baseOperating Temperature | 0 … +60 °C (+32 … +140 °F)Storage Temperature | -40 … +85 °CHumidity (non-condensing) | 5 % – 95 % RHDimensions (H × W × D) | 119 mm × 47 mm × 87 mm (4.69″ × 1.85″ × 3.43″)Weight | Approx. 0.22 kg (0.49 lb)Enclosure Rating | IP20 (install inside control cabinet)Certifications | UL Listed, cULus, CE Marked, C-Tick, RoHS Compliant, Class I Div 2 Groups A–D (select revisions)

Main Features and Advantages

High 8.5 A FLEX bus drive capability: The Allen-Bradley 1794-PS13​ can source up to 8.5 A on the 5 V DC FLEX backplane, which is sufficient to power the majority of fully populated 1794 racks—including mixed analog, digital, and specialty modules—without concern for individual module current budgets. This makes the Allen-Bradley 1794-PS13​ the preferred choice for large FLEX I/O assemblies, whereas the lower-capacity 1794-PS1 (1.3 A) or 1794-PS4 (4 A) may be inadequate for dense configurations.24 V DC external input simplifies panel design: Unlike AC-powered FLEX power supplies (discontinued or region-specific variants), the Allen-Bradley 1794-PS13​ runs off the same 24 V DC control supply that typically powers sensors, solenoid valves, and the adapter itself. This eliminates the need for a separate AC branch circuit to the I/O rack, reduces panel wiring complexity, and makes the Allen-Bradley 1794-PS13​ ideal for export machinery and OEM skids that standardize on DC-only control voltage.Comprehensive self-protection and diagnostics: The Allen-Bradley 1794-PS13​ incorporates input undervoltage lockout (module will not attempt to power the bus if input falls below approx. 18 V DC), output overcurrent shutdown with auto-retry (“hiccup” mode), and thermal protection. The front-panel LEDs—24V IN (confirms external DC is present and above threshold), 5V OK (confirms regulated output is within tolerance and supplying bus), and FLT (flags abnormal conditions)—allow maintenance staff to diagnose power issues at a glance without a multimeter or programming terminal.