1746-P2 Allen-Bradley SLC 500 Power Supply | PLC Power Module

1746-P2 | Allen-Bradley SLC 500 Power Supply Module

Stable Power. Reliable Control. Practical System Integration.

The Allen-Bradley 1746-P2 is an AC power supply module for compatible Allen-Bradley SLC 500 programmable logic controller systems. It converts the specified AC input into DC power for supported chassis electronics and field-related power requirements.

Its rated outputs provide 5 A at 5 V DC and 0.96 A at 24 V DC. These outputs support the power requirements of compatible SLC 500 system components. Engineers should verify the chassis load budget before installing or replacing the module.

Product Identification	Details
Manufacturer	Allen-Bradley / Rockwell Automation
Model Number	1746-P2
Product Family	SLC 500
Module Type	AC power supply module
GTIN	10662468088326
UPC	662468088329
Listed Weight	2.00 lb (approximately 0.91 kg)
Mounting Method	Compatible SLC 500 chassis mounting

01 | Power Architecture and Output Capacity

The 1746-P2 supplies DC power to compatible SLC 500 control hardware. Correct selection starts with the AC input source, chassis requirements, and total power demand.

Electrical Parameter	Rated Specification	Engineering Consideration
AC Input Voltage	120/240 V AC	Verify the available supply and the manufacturer's input configuration instructions.
5 V DC Output Current	5 A	Check the combined current demand of the installed chassis modules.
24 V DC Output Current	0.96 A	Confirm the load requirements for circuits using this output.
Power Conversion	AC input to DC outputs	Use only with the specified compatible control hardware.
Installation	Chassis mounted	Confirm chassis compatibility before installation.
Rack Support	Compatible chassis installation	Verify the exact chassis configuration and mounting arrangement.

Important: The 5 V and 24 V output ratings describe separate output capacities. They do not establish the module's total combined power rating or guarantee that every chassis configuration can use both outputs at their maximum values simultaneously.

02 | Environmental Operating Limits

Temperature and humidity conditions affect power-supply reliability. Use the following supplied limits when reviewing the installation environment.

Environmental Parameter	Specification
Minimum Operating Temperature	0°C
Maximum Operating Temperature	60°C
Minimum Storage Temperature	-40°C
Maximum Storage Temperature	85°C
Maximum Relative Humidity	95%, subject to the applicable manufacturer conditions

Confirm humidity limits, condensation restrictions, and installation clearances against the applicable hardware manual. Storage limits do not represent operating limits.

03 | Where the 1746-P2 Fits in an Automation System

This power supply suits compatible SLC 500 control architectures that require the specified AC input and DC output capacity.

• PLC Control Panels: Supply compatible SLC 500 chassis electronics in industrial control cabinets.
• Manufacturing Equipment: Support PLC-based machine sequencing and production control.
• Conveyor Systems: Power compatible controller hardware used in material-handling applications.
• Pumping and Utility Systems: Support control logic for compatible pump stations and utility equipment.
• Packaging Machinery: Provide DC power to supported PLC chassis components used in automated packaging lines.
• Plant Maintenance: Replace a matching power supply after confirming the chassis and electrical requirements.
• Existing SLC 500 Installations: Maintain compatible control-system hardware during planned servicing.

Application suitability depends on the installed chassis, connected modules, cabinet environment, and system design. The power supply does not independently perform PLC logic or machine control.

04 | Installation and Replacement Procedure

Follow a controlled replacement process to reduce wiring errors and protect the controller system.

1. Identify the Existing Hardware: Record the installed power-supply model and SLC 500 chassis part number.
2. Verify AC Input: Confirm the supply voltage and applicable manufacturer wiring instructions.
3. Review the Power Budget: Check the load requirements for all installed modules.
4. Isolate Electrical Power: Disconnect the applicable supply and follow site lockout/tagout procedures.
5. Inspect the Chassis: Check mounting points, connectors, wiring, and signs of overheating.
6. Install the Replacement: Follow the hardware manual for mounting and electrical connections.
7. Inspect Before Energizing: Verify terminal security, grounding, wiring polarity where applicable, and clearances.
8. Restore Power Safely: Follow the approved startup procedure and check the controller system's status.
9. Validate Operation: Confirm that the controller and installed modules operate normally.
10. Record the Results: Document the replacement, observed symptoms, and commissioning checks.

Never remove or install a power supply while energized unless the manufacturer explicitly permits the procedure. Confirm the applicable safety instructions before servicing the chassis.

05 | Field Diagnostics and Fault Isolation

A power-supply problem can affect multiple modules simultaneously. Engineers should distinguish supply-related faults from individual module failures before replacing hardware.

Observed Symptom	Possible Cause	Recommended Check
Controller fails to start	Missing AC input, incorrect wiring, or power-supply failure	Check the incoming supply and follow the manufacturer's diagnostic procedure.
Multiple modules show abnormal behavior	Power instability or excessive chassis loading	Review supply conditions and the combined module power requirements.
Repeated controller resets	Unstable input power, connection problems, or a system fault	Check supply stability, connections, and controller fault records.
Unexpected shutdown during operation	Thermal conditions, supply interruption, or excessive loading	Inspect cabinet temperature, input voltage, and the installed load.
New module fails after replacement	Incorrect part selection, chassis incompatibility, or wiring errors	Recheck the part number, chassis documentation, and installation.
Power problems recur after restart	Underlying electrical or load issue remains unresolved	Record the conditions and investigate the root cause before another replacement.

Diagnostic note: The symptoms above are troubleshooting possibilities, not confirmed failure codes for this specific module. Use manufacturer documentation and suitable electrical test equipment to establish the cause.

06 | Global PLC Spare HUB's Insight

When evaluating an SLC 500 power-supply replacement, our engineering approach starts with the complete chassis configuration and its electrical load. A matching part number is important, but it is not the only selection criterion.

Practical Example: A Controller Resets After Additional Modules Are Installed

An engineer adds modules to an existing SLC 500 chassis. The system then begins resetting intermittently, even though the controller previously operated normally.

• Check whether the incoming AC supply remains within the specified requirements.
• Recalculate the chassis load using the applicable module power-consumption data.
• Inspect wiring connections and look for signs of heat damage.
• Compare the observed behavior with the controller and power-supply diagnostic information.
• Confirm that the installed supply supports the actual chassis configuration.

This process helps determine whether the problem relates to supply loading, input power, connections, or another controller fault. Replacing the power supply without checking the load may leave the original problem unresolved.

Engineering recommendation: Provide the existing chassis model, installed module list, input voltage, and fault symptoms when requesting a replacement. These details improve compatibility checks and reduce unnecessary commissioning work.

07 | Compatibility and Procurement Checklist

Confirm these items before ordering the 1746-P2.

• Confirm the complete power-supply part number.
• Identify the installed SLC 500 chassis model.
• Verify the available AC input voltage.
• Check the power requirements of all installed modules.
• Review the operating temperature and humidity conditions.
• Confirm mounting and wiring requirements against the applicable manual.
• Verify any site-specific compliance or documentation requirements.

Do not assume compatibility with other PLC families solely because they use similar supply voltages. Confirm the exact hardware requirements before installation.

08 | Packaging, Shipping and Warranty

Item	Details
Product	Allen-Bradley 1746-P2 power supply module
Package Contents	Module as specified in the confirmed order
Accessories	Confirm included accessories before purchase.
Dispatch Time	Typically 24–48 hours after stock and order confirmation
Shipping Options	FedEx, UPS, or DHL, subject to destination and service availability
Warranty	12-month seller warranty, subject to written terms and conditions
Quotation Support	Request pricing, availability, compatibility checks, and delivery estimates.

Confirm stock status, package contents, and warranty coverage before placing an order. Delivery estimates depend on the destination, carrier service, and customs clearance.

09 | Frequently Asked Questions

Q1: How can I determine whether the existing power supply has enough capacity for an expanded chassis?

Calculate the required current for the installed modules using the applicable hardware specifications. Compare the resulting load with the supported supply capacity and chassis requirements before adding hardware.

Q2: Why should I inspect the cabinet environment when investigating power-supply faults?

Excessive temperature, restricted airflow, and unsuitable environmental conditions can affect equipment reliability. Check cabinet ventilation and operating conditions against the manufacturer's limits.

Q3: Can I select a replacement using only the 120/240 V AC input rating?

No. Input voltage alone does not establish compatibility. Verify the exact part number, chassis requirements, output ratings, mounting arrangement, and applicable hardware documentation.

Q4: What should I document after replacing the module?

Record the replacement part number, chassis identification, input voltage, observed startup behavior, controller status, and any remaining alarms. This information helps future maintenance teams identify recurring problems.

Q5: What information helps obtain the most accurate quotation?

Provide the part number, required quantity, installed chassis model, destination country, and requested delivery date. Include the existing nameplate details when you need a compatibility review.

Request a Quote for Allen-Bradley 1746-P2

Need the 1746-P2 SLC 500 power supply for a planned replacement or maintenance project?

Contact Global PLC Spare HUB to request pricing, check availability, and confirm hardware compatibility. Share your chassis details and delivery destination to help our team assess the order requirements.

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