The Allen-Bradley 1746-P1 is a rack-mount power supply for the SLC 500 programmable controller family. It accepts 120/240V AC input and provides 2A at 5V DC and 0.46A at 24V DC backplane power, along with a 200 mA user-power output for external sensors.
Item No :
1746-P1Order(MOQ) :
1 PiecePayment :
EXWProduct Origin :
MalaysiaShipping Port :
WuhanLead Time :
3~5 daysWeight :
5kg| Specification | Description |
|---|---|
| Manufacturer | Allen-Bradley / Rockwell Automation |
| Model | 1746-P1 |
| Product Family | SLC 500 |
| Product Type | Rack-Mount Power Supply |
| Input Voltage | 85–132V AC / 170–265V AC, 47–63 Hz (jumper-selectable) |
| Typical Line Power | 135 VA |
| Inrush Current | 20 A max |
| Backplane Current (5V DC) | 2 A |
| Backplane Current (24V DC) | 0.46 A |
| 24V User Power Output | 18–30V DC, 200 mA |
| Fuse Protection | 1746-F1 or equivalent (3A fast-acting) |
| CPU Hold-up Time | 20 ms (full load) / 3000 ms (no load) |
| Isolation Voltage | 1800V AC RMS for 1 second |
| Operating Temperature | 0°C to +60°C (derate 5% above 55°C) |
| Storage Temperature | -40°C to +85°C |
| Dimensions (H x W x D) | Approx. 140 x 58 x 145 mm |
| Weight | Approx. 0.9 kg (2.0 lbs) |
| Mounting | Left side of 1746 chassis (does not occupy I/O slot) |
| Certifications | UL, cUL, CE, C-Tick |
| Lifecycle Status | Active (legacy platform) |
| Model | Description | Typical Application |
|---|---|---|
| 1746-P2 | Higher-capacity power supply (5A at 5V DC, 3.6A at 24V DC) | Larger SLC 500 systems requiring more backplane current |
| 1746-P3 | Similar to P1 but with 24V DC auxiliary output; 85–132/170–265V AC input | Systems requiring additional 24V DC power |
| 1746-P4 | High-capacity power supply (10A at 5V DC, 2.88A at 24V DC) | Large, complex SLC 500 configurations |
| 1746-P5 | 24V DC input power supply | DC-powered control systems |
| 1746-P6 | 125V DC input power supply | DC-powered applications |
| 1746-P7 | 48V DC input power supply | Telecom and DC-powered systems |
| 1746-F1 | Replacement fuse for 1746-P1 | Spare fuse for maintenance |
Q1: What is the primary function of the 1746-P1?
It is a power supply module that mounts on the left side of a 1746 chassis and provides backplane power (5V DC and 24V DC) to all connected SLC 500 I/O modules and the processor. It also provides 24V DC user power for external sensors .
Q2: What input voltage does the 1746-P1 accept?
The power supply accepts 85–132V AC or 170–265V AC at 47–63 Hz. A jumper/voltage selector on the module must be set correctly for either 120V or 240V operation before applying power. Incorrect jumper settings can cause catastrophic failure .
Q3: What are the output current capacities?
5V DC backplane: 2 A
24V DC backplane: 0.46 A
24V DC user power: 200 mA (18–30V DC range)
Q4: Can I upgrade to a higher-capacity power supply?
Yes. If your SLC 500 system outgrows the 1746-P1's capacity, you can upgrade to the 1746-P2 (5A at 5V DC) or 1746-P4 (10A at 5V DC) for additional backplane current. The 1746-P2 is mechanically and electrically compatible with the same chassis .
Q5: What should I check if the power supply fails?
Common failure points include:
Blown fuse (1746-F1 or 3A fast-acting) – often caused by a shorted backplane or faulty I/O module
Voltage selector misconfiguration – applying 240V with the jumper set to 115V causes MOV and capacitor failure
Backplane short circuit – test the power supply in an empty chassis; if the fuse still blows, the backplane is likely damaged
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