1746-P4 Allen-Bradley

1746-P4 Allen-Bradley I / O module

Product  Description：

The 1746-P4 is a chassis-mounted power supply that sits on the far left side of an SLC 500 modular rack. Unlike some other power supplies in the series that run on 120/240V AC, the 1746-P4 is a 24V DC input power supply. This makes it ideal for industrial environments where DC battery banks or localized 24V DC power distribution is the primary energy source. It converts the incoming DC voltage into the specific levels required by the modules seated in the backplane ($5 \text{ VDC}$ and $24 \text{ VDC}$).

Product Parameters

• Input Voltage: $24 \text{ VDC}$ nominal (Range: $19.2$ to $28.8 \text{ VDC}$)

• Backplane Current Capacity at 5V DC: $10 \text{ Amps}$

• Backplane Current Capacity at 24V DC: $2.88 \text{ Amps}$

• Inrush Current: Maximum $45 \text{ Amps}$

• Input Power: $150 \text{ Watts}$ maximum

• Isolation: $500 \text{ VDC}$ (between input terminals and backplane)

• User-Power Output: $24 \text{ VDC}$ (nominal), $1 \text{ Amp}$ (available for external sensors or devices)

• Internal Protection: Includes overvoltage protection and fuse protection to safeguard against electrical faults.

Product Advantages

The most significant advantage of the 1746-P4 is its High Current Output. With 10 Amps available on the 5V rail, it can support fully loaded 13-slot or 10-slot chassis that contain power-hungry communication or analog modules. Its DC Input Design is a major benefit for remote sites, telecommunications hubs, or mobile applications where AC power is unavailable or unreliable. Additionally, the Modular Form Factor allows for quick installation and replacement without requiring complex rewiring of the entire PLC system. The inclusion of a User-Power Terminal also saves cost by providing a small amount of 24V DC power for field devices directly from the PLC rack.

Important Considerations and Precautions

When installing the 1746-P4, you must ensure that the Total Current Load of all modules in the chassis does not exceed the power supply's rating. Exceeding the $10 \text{ A}$ limit on the 5V rail will lead to thermal shutdowns or intermittent system resets. It is also vital to use Proper Wire Gauges for the 24V DC input to minimize voltage drops, especially if the power source is located far from the PLC.

Since this is a DC-powered unit, Polarity Awareness is critical; reversing the positive and negative leads can damage the unit if the internal protection is bypassed. Furthermore, the 1746-P4 should be installed in an enclosure with Adequate Ventilation. The unit generates significant heat when running at high loads, and restricted airflow can shorten the lifespan of the internal capacitors.

Product Applications

The 1746-P4 is widely used in specific industrial scenarios where DC power is the standard.

• Remote Monitoring Stations: Used in oil and gas pipelines or water treatment sites where the system is powered by solar panels and battery banks.

• Telecommunications Infrastructure: Integrated into power rooms that operate on standard industrial DC voltages.

• Large-Scale Manufacturing: Employed in heavy industrial plants where a centralized 24V DC "clean" power bus is used to feed all control electronics to avoid AC line noise.

• Emergency Systems: Used in applications that require a "no-break" power solution, where the PLC must stay operational via batteries during a total AC power failure.

The structure and details of the product：

Our services：

Shipping Port:  China

Payment: Bank of Chicago, Bank of Singapore

Express cooperation: fedex, DHL, UPS and your express account

Service: Professional Sales provides 24 hours /7 days online service

Warranty: one year

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Our main products include DCS control system spare parts, PLC system spare parts, and robot system spare parts. Our advantageous brands include Allen Bradley, Bently Nevada, ABB, HIMA, Reliance, Bender, National Instruments, Emerson Ovation, Honeywell, Siemens, Allen Bradley, ICS Triplex, FOXBORO, Schneider, GE Fanuc, Motorola, HIMA, Prosoft, and other imported industrial components. Our main products serve a wide range of electronic, metallurgical, chemical, and power plants Industries such as steel mills, rubber, cement, machinery and equipment, and construction.