The Allen-Bradley 1746-P4, also cataloged as the 1746-P4 SLC 500 Power Supply Module, operates as a dedicated power conversion component for supplying backplane and field power requirements within SLC 500 control platforms.

Model Configuration Overview

The 1746-P4 is an SLC 500 power supply module designed to provide regulated DC power distribution for SLC processor and I/O chassis operation. The module accepts 120 to 220 VAC input and supplies backplane power through the SLC 500 rack structure.

Hardware Specifications

SLC 500 Power Distribution Characteristics

The 1746-P4 provides chassis power conversion for SLC 500 processor and I/O modules. The power supply regulates DC output levels for the backplane bus, supporting processor communication and module operation.

The SLC 500 architecture uses defined backplane power distribution. The 1746-P4 current capacity must be matched with installed processor and I/O module loading to maintain correct system operation.

Firmware and Backplane Compatibility

The SLC 500 platform uses fixed backplane communication structures between processors, power supplies, and I/O modules. The 1746-P4 does not provide firmware functions but supports the electrical requirements of SLC 500 hardware configurations.

System design requires verification of backplane load calculations, module current consumption, and chassis power requirements before installation.

Ordering Info

• 1 x Allen-Bradley 1746-P4 SLC 500 Power Supply Module
• 1 x Power supply housing assembly
• 1 x Factory-installed power conversion circuitry
• Compatible SLC 500 chassis installation required separately

Field Installation Guidelines

Power Connection

• Verify AC input voltage range before applying power.
• Remove input power before installing or removing the module.
• Confirm terminal wiring polarity and connection tightness before startup.

Backplane Installation

• Install the module in the designated SLC 500 chassis power supply position.
• Check processor and I/O module current demand against available power capacity.
• Ensure proper mechanical engagement with chassis connectors.

Electrical Maintenance

• Inspect power terminals for overheating or mechanical looseness.
• Maintain cabinet grounding according to industrial control standards.
• Monitor system loading when additional I/O modules are added.

Frequently Asked Questions

• What input voltage range does the 1746-P4 support?

The 1746-P4 accepts 120 to 220 VAC input power for SLC 500 system operation.

• What backplane current does the 1746-P4 provide at 5 VDC?

The module provides up to 10 A backplane current at 5 VDC for connected SLC 500 modules.

• Does the 1746-P4 provide 24 VDC output?

Yes. The module provides an output voltage range of 18 to 30 VDC with 24 VDC current capacity.

• What is the inrush current rating of the power supply?

The specified inrush current for the 1746-P4 is 45 A during power application.

• Can the 1746-P4 be installed in any SLC 500 position?

No. The module must be installed according to the SLC 500 chassis power supply configuration.

• Does the 1746-P4 contain programmable firmware?

No. The module is a power supply device and does not execute application firmware.

• What should be checked before replacing the power supply?

Verify AC input requirements, chassis compatibility, and total backplane current loading before replacement.

• Does the 1746-P4 support hot swapping?

Hot swapping is not specified. Power should be removed before installation or removal.