New Allen Bradley 1746-P1 SLC 500 Rack-mount Power Supply

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FAQs

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