PRODUCT INFORMATION
Product Overview
The Allen-Bradley 1746-P7 is an SLC 500 Power Supply Module. It operates across a direct-current input range of 10 to 30 VDC. Nominal input voltage ranges from 12 to 24 VDC. Input line power requirements are 50 VA at 12 VDC and 75 VA at 24 VDC. Real input power is 50 Watts at 12 VDC and 75 Watts at 24 VDC. Maximum inrush current reaches 20 A during system startup. Soldered fuse protection protects the unit from internal short circuits.
The module installs in the leftmost position of a 1746 chassis without occupying an I/O slot. At 12 VDC input, backplane current capacities are 2.0 A at 5 VDC and 0.46 A at 24 VDC. At 24 VDC input, backplane capacities increase to 3.6 A at 5 VDC and 0.87 A at 24 VDC. Operating temperatures span from 0 to 60 degrees Celsius. Current capacity derates by 5 percent when ambient temperatures exceed 55 degrees Celsius. If input voltage drops between 4 and 9 VDC, the controller turns off. Normal controller operation resumes when input voltage recovers to 11 VDC.
TECHNICAL DATA
Technical Specifications
| Parameter | Specification |
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| Category | PLCs |
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| Product Line | SLC 500 |
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| UPC | 662468640886 |
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| Weight | 1.44 lbs (0.65 kg) |
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| Module Type | Power Supply |
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| Input Voltage Range | 10-30 Volts DC |
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| Input Voltage | 10...30V dc |
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| Input Power | 75 or 50 Watts |
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| Typical line power requirement | 12V dc input: 50VA; 24V dc input: 75VA |
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| Inrush Current | 20 A (required for turn-on) |
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| Internal Current Capacity | 12V dc input: 2.0 A at 5V dc 0.46 A at 24V dc; 24V dc input: 3.6 A at 5V dc 0.87 A at 24V dc |
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| CPU Hold up time, 12 VDC input | 12V dc input: 1.37 ms at 0V dc (full load) 895 ms at 0V dc (no load) 10 ms at 9V dc (full load) continuous at 9V dc (no load) |
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| CPU Hold up time, 24VDC input | 24V dc input: 40 ms at 0V dc (full load) 1860 ms at 0V dc (no load) 790 ms at 11V dc (full load) continuous at 11V dc (no load) |
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| CPU Hold up time | 20 ms (full load) 3000 ms (no load) |
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| Backplane Current (24 Volts) | 0.46 Amps |
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| Frequency | 47 to 63 Hertz |
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| Location | 1746 Chassis |
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| Operating Temperature | 0 to 60 Celsius |
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| Fuse Protection | 1746-F1 or equivalent |
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TECHNICAL INFORMATION
Features
- Accepts a DC input voltage range from 10 to 30 VDC.
- Delivers 3.6 A at 5 VDC and 0.87 A at 24 VDC with 24 VDC input.
- Delivers 2.0 A at 5 VDC and 0.46 A at 24 VDC with 12 VDC input.
- Features soldered fuse protection against short-circuit fire hazards.
- Mounts directly to the chassis without consuming an I/O slot.
TECHNICAL INFORMATION
Applications
- Supplies DC power to Allen-Bradley SLC 500 modular hardware.
- Powers SLC 500 controllers and expansion racks from 12 VDC or 24 VDC sources.
TECHNICAL INFORMATION
Connections / Interfaces
- Terminal block accepts up to two 14 AWG copper wires per terminal point.
- Backplane connector interfaces directly with the SLC 500 chassis backplane bus.
TECHNICAL INFORMATION
Installation Guidelines
- Mount the power supply directly on the leftmost position of the 1746 chassis.
- Always disconnect incoming electrical power before wiring terminal connections.
- Tighten all terminal screws to a torque of 0.8 Nm (7 lb-in).
- Use an isolation transformer when switching inductive loads near the power supply.
TECHNICAL INFORMATION
Configuration Guidelines
- Calculate total module backplane current requirements before selecting chassis components.
- Derate internal current capacity by 5 percent when ambient temperature exceeds 55 degrees Celsius.
TECHNICAL INFORMATION
Compatibility
- Compatible with Allen-Bradley SLC 500 1746 chassis assemblies.
- Provides power to SLC 500 processors and 1746 I/O modules.
TECHNICAL RESOURCES
Documentation
COMPATIBILITY
Compatibility & Replacement
COMPATIBLE MODELSCompatible with Allen-Bradley SLC 500 1746 chassis assemblies. Provides power to SLC 500 processors and 1746 I/O modules.
Verify compatibility against the exact Part Number, revision and manufacturer documentation before ordering.
PART VERIFICATION
Before You Order
Industrial automation parts can share similar model names, suffixes and revisions. Confirm the complete manufacturer Part Number before purchase.
01Check Part NumberMatch the complete ordering code on the existing unit.
02Confirm RevisionCheck suffix, hardware or firmware when applicable.
03Send a Label PhotoWe can review a clear label photo when identification is uncertain.
ORDERING PROCESS
From RFQ to Dispatch
1Submit Part Number2Verify Product Identity3Confirm Stock & Condition4Issue Quotation5Dispatch & Tracking
PRODUCT FAQ
Frequently Asked Questions
Does the 1746-P7 power supply occupy an I/O module slot?
No. The unit mounts on the leftmost side of the chassis without using an I/O slot.
What is the maximum startup inrush current for the 1746-P7?
The unit requires a maximum inrush current of 20 A to turn on.
How does the 1746-P7 handle low input voltage conditions?
The controller shuts off between 4 and 9 VDC and restarts when input reaches 11 VDC.
What wire gauge should be used for the terminal block?
Use up to two 14 AWG copper wires per terminal, tightened to 0.8 Nm torque.
