PRODUCT INFORMATION
Product Overview
The Allen-Bradley 1746-OA8 is an SLC 500 discrete AC output module. It energizes AC loads operating from 85 to 264 VAC at 47 to 63 Hz. Nominal operating voltages include 120 VAC and 240 VAC. The module provides eight discrete output channels organized into two isolated groups. It installs into a single slot of a 1746 chassis.
Each output delivers 1.0 A continuous current at 30 °C or 0.50 A at 60 °C. Maximum aggregate continuous current is 8.0 A at 30 °C and 4.0 A at 60 °C. The module draws 185 mA backplane current at 5 VDC. On-state voltage drop is 1.50 V at 1.0 A. Maximum surge current reaches 10 A for 25 ms per point.
TECHNICAL DATA
Technical Specifications
| Parameter | Specification |
|---|
| Applications | General Purpose |
|---|
| Backplane Current (5 Volts) | 185 milliamps |
|---|
| Backplane current consumption | 185 mA |
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| Category | PLCs |
|---|
| Continuous current per module | 8.0 A at 30 °C (86 °F); 4.0 A at 60 °C (140 °F) |
|---|
| Continuous current per point | 1.00 A at 30 °C (86 °F); 0.5 A at 60 °C (140 °F) |
|---|
| Current/Module (30 Celsius) | 8 amps |
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| Current/Output at 30 Celsius | 1 amp |
|---|
| Current/Output at 60 Celsius | 0.5 amp |
|---|
| Module Type | Discrete AC output module |
|---|
| No. of channels per group | 4 |
|---|
| No. of groups | 2 |
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| Nom Output Voltage | 120 / 240 VAC |
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| OFF Signal delay, max. resistive load | 11 ms |
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| ON Signal delay, max. resistive load | 1 ms |
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| On-state voltage drop, max | 1.5V at 1.0 A |
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| Output Voltage Range | 85-264 VAC |
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| Outputs | 8 |
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| Step Response | 60 milliseconds in, 2.5 milliseconds out |
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| Surge current per point | 10 A for 25 ms |
|---|
| UPC | 662073521334 |
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| Voltage Range | 85-265 Volts AC |
|---|
| Weight | 0.75 lbs (0.34 kg) |
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TECHNICAL INFORMATION
Features
- Eight discrete AC output points arranged in two groups of four channels.
- Supports operating voltage from 85 to 264 VAC across 47 to 63 Hz.
- Delivers 1.0 A continuous current per point at 30 °C.
- Delivers 0.50 A continuous current per point at 60 °C.
- Supports aggregate current of 8.0 A at 30 °C and 4.0 A at 60 °C.
- Withstands surge currents up to 10 A for 25 ms per channel.
- Draws 185 mA backplane current at 5 VDC.
- Signal response times provide 1 ms turn-on and 11 ms turn-off delays.
TECHNICAL INFORMATION
Applications
- General purpose discrete switching of AC loads from 85 to 264 VAC.
- Energizing AC field devices operating at nominal 120 VAC or 240 VAC.
TECHNICAL INFORMATION
Connections / Interfaces
- Eight AC output points organized into two isolated groups of four channels each.
- Backplane connector interfaces directly with the 1746 chassis backplane.
TECHNICAL INFORMATION
Installation Guidelines
- Disconnect all chassis and field power before inserting or removing the module.
- The module does not support Removal and Insertion Under Power (RIUP).
- Install the module into any available 1746 chassis slot except slot zero.
- Slot zero is reserved exclusively for the SLC 500 processor.
TECHNICAL INFORMATION
Configuration Guidelines
- Configure the 1746-OA8 module within the SLC 500 rack I/O configuration.
- Derate individual point current to 0.50 A at ambient temperatures up to 60 °C.
- Ensure connected AC loads draw at least 10 mA minimum operating current.
TECHNICAL INFORMATION
Compatibility
- Compatible with 1746 chassis slots except slot zero.
- Operates in SLC 500 control systems alongside SLC 500 processors.
TECHNICAL INFORMATION
Compliance and Certifications
- UL Listed
- CSA Certified
- NEMA ICS 2-230 Noise Immunity
COMPATIBILITY
Compatibility & Replacement
COMPATIBLE MODELSCompatible with 1746 chassis slots except slot zero. Operates in SLC 500 control systems alongside SLC 500 processors.
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
Can the 1746-OA8 module be removed or inserted while the rack is powered?
No. The 1746-OA8 does not support Removal and Insertion Under Power. Always disconnect rack power before handling.
What is the maximum continuous current rating for each output point?
Each point delivers up to 1.0 A at 30 °C. Current derates to 0.50 A at 60 °C.
Where can the 1746-OA8 be installed within a 1746 chassis?
It installs into any available slot except slot zero. Slot zero is reserved for the processor.
What is the minimum load current required per output point?
The minimum continuous load current required for each output point is 10 mA.
