Overview
The Allen-Bradley 1746-P4 is a rack-mounted power supply module for SLC 500 PLC systems. This unit delivers regulated DC power to the backplane and I/O modules within a 1746 modular chassis, ensuring consistent performance in industrial automation environments. With 92W output capacity and dual-voltage input support, the 1746-P4 is ideal for larger SLC 500 installations requiring higher backplane current distribution.
Key Features
- 92W Output Power: Provides maximum power delivery of 92W across all outputs, supporting larger chassis with multiple I/O modules.
- High Internal Current Capacity: 10.0A at 5V DC and 2.88A at 24V DC—highest capacity in the 1746 power supply family.
- Dual-Voltage Input: Supports 85–132V AC and 170–265V AC via jumper selection; single power cord for global installation.
- Hold-Up Time Protection: 20 ms full-load and 3000 ms no-load hold-up time allows processor to handle brief power interruptions without logic corruption.
- Built-in Fuse Protection: Soldered-in 1746-F4 fuse guards against short-circuit fire hazards.
- LED Power Indicator: Visual confirmation of supply operation for quick troubleshooting.
Technical Specifications
- Input Voltage (Nominal): 120/220V AC (jumper-selectable)
- Input Voltage Range: 85–132V AC or 170–265V AC, 47–63 Hz
- Maximum Output Power: 92W (combined backplane and user supply)
- Backplane Output (5V DC): 10.0A max
- Backplane Output (24V DC): 2.88A max
- Output Voltage Range: 20.4–27.6V DC (20.4V nominal at 24V output)
- 24V User-Supplied Current Capacity: 1.0A max
- 24V DC Voltage Range: 18–30V DC
- Maximum Inrush Current: 45A
- Hold-Up Time: 20 ms (full load) / 3000 ms (no load)
- Operating Temperature: 0–60°C (32–140°F); derate 5% above 55°C
- Mounting: DIN-style rail, left-end slot of 1746 chassis
- Certifications: UL Listed (Industrial Control Equipment), CSA Certified, Class 1 Div 2 Groups A/B/C/D
Typical Applications
The 1746-P4 is suited for:
- Large SLC 500 chassis installations (10- and 13-slot configurations)
- Applications requiring high I/O module density and maximum backplane current
- Machine control, process automation, and manufacturing systems
- Retrofits and system upgrades where existing 1746-P1/P2/P3 supplies lack capacity
- Equipment designed for both 120V and 220V regions
Compatibility & Replacements
Compatible With
- Allen-Bradley SLC 500 controllers (SLC 5/01, 5/02, 5/03, 5/04, 5/05)
- 1746-series modular chassis (4-, 7-, 10-, and 13-slot configurations)
- All 1746 I/O modules (input, output, analog, specialty)
- Remote I/O chassis via backplane connection
- Standard DIN-rail mounting systems
Replaces / Drop-In Replacement For
- Earlier revisions of the Allen-Bradley 1746-P4
- Note: The 1746-P4 has the highest output capacity in the 1746 family and is not directly replaceable by 1746-P1, P2, or P3 (lower power ratings). Upgrade applications may replace lower-capacity supplies with this unit.
Works With
- RSLogix 500 programming software (processor configuration)
- APS (Allen-Bradley Programming Software)
- 1746-F4 fuse (or equivalent 250V/3A time-delay fuse)
- Standard SLC 500 network modules and communication adapters
