PRODUCT INFORMATION
Product Overview
The Allen-Bradley 1791-0A16 is an Output I/O Block within the Block I/O 1791 series. This unit features sixteen AC output channels arranged in two groups of eight channels. The device operates across an output voltage range of 20 to 132 Volts AC at 47 to 63 Hertz. It functions as distributed input and output hardware located near field instrumentation. Field devices connect directly to reduce lengthy signal cable runs across industrial plant floors.
External power requires an operating supply voltage between 85 and 132 Volts AC with 150 milliamps continuous current. Built-in isolation circuits provide 500 Volts AC between the power supply and remote I/O logic. Group-to-group and group-to-logic circuits provide 1250 Volts AC isolation. Output circuits switch loads including pilot lamps, buzzers, sirens, relays, and contactors. The unit includes a removable terminal strip for wiring maintenance and quick module replacement.
TECHNICAL DATA
Technical Specifications
| Parameter | Specification |
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| Category | PLCs |
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| UPC | 612598127023 |
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| Weight | 0.31 lbs (0.14 kg) |
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| Compatible Controllers | PLC-2, PLC-3, PLC-5/20, and PLC-5 |
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| Module Type | Digital AC Output Module |
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| No. of Outputs | Sixteen (16) outputs |
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| Channel Grouping | Two (2) groups of Eight (8) channels |
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| Nominal Output Voltage | 120 VAC |
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| Operating Voltage Range | 20-132 VAC |
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| Output Delay Time, OFF to ON | 1.0 ms delay At 60 Hz and 1.0 ms delay at 50 Hz. |
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| Output Delay Time, ON to OFF | 8.3 ms at 60 Hz or 10.0 ms at 50 Hz. |
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| OFF state leakage current | 3 mA |
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| Maximum On-state Current | 50 mA per output |
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| Surge Current | 10 A for 50 ms each, repeatable every 2 sec. |
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| Mounting orientation | Vertical and Horizontal |
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| Voltage | 120V ac |
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| Inputs per Block | 0 |
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| Outputs per Block | 16 |
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| Output Voltage Range | 20-132V ac |
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| External Power | 85-132V ac |
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| Min. On-state Current | 50mA per output |
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| Max. On-state Voltage Drop | 1.5V peak @ 300mA |
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| Output Signal Delay | 8.3ms @ 60Hz on; 10ms @ 50Hz off |
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| Product Lifecycle Status* | Discontinued/Obsolete |
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TECHNICAL INFORMATION
Features
- Provides sixteen AC output channels organized in two isolated groups of eight outputs.
- Operates across an operating voltage range of 20 to 132 Volts AC.
- Includes built-in status indicators to support hardware troubleshooting and operational monitoring.
- Features a removable terminal strip accepting 14 AWG stranded signal wire.
- Delivers optical isolation rated at 1250 Volts AC between output groups and logic.
TECHNICAL INFORMATION
Applications
- Distributed control of AC pilot lamps, buzzers, and alarm sirens.
- Direct actuation of external interposing relays and motor starter contactors.
- Decentralized machine control architectures using legacy Programmable Logic Controllers.
TECHNICAL INFORMATION
Connections / Interfaces
- Equipped with a removable terminal strip for field wiring connections.
- Terminal blocks accept 14 AWG stranded copper conductors with 3/64-inch maximum insulation thickness.
TECHNICAL INFORMATION
Installation Guidelines
- Mount the unit in either a horizontal or vertical orientation on the panel.
- Vertical mounting supports up to 600 milliamps at 30 degrees Celsius.
- Vertical mounting output current drops to 300 milliamps at 60 degrees Celsius.
- Horizontal mounting supports up to 300 milliamps at 30 degrees Celsius.
- Horizontal mounting output current drops to 150 milliamps at 60 degrees Celsius.
- Terminate connections using 14 AWG stranded wire with maximum insulation thickness of 3/64 inches.
TECHNICAL INFORMATION
Configuration Guidelines
- Verify the scanner processor throughput requirements and total transmission distance prior to installation.
- Confirm that connected field loads match the required continuous current specifications before energizing.
TECHNICAL INFORMATION
Compatibility
- Compatible with Allen-Bradley PLC-2 programmable controllers.
- Compatible with Allen-Bradley PLC-3 programmable controllers.
- Integrates with PLC-5 and PLC-5/20 processor systems over Remote I/O links.
TECHNICAL INFORMATION
Lifecycle / Replacement Information
- The 1791-0A16 block is categorized as discontinued and obsolete by the original manufacturer.
- Existing installations require managed spares or legacy hardware refurbishment for maintenance.
TECHNICAL RESOURCES
Documentation
COMPATIBILITY
Compatibility & Replacement
COMPATIBLE MODELSCompatible with Allen-Bradley PLC-2 programmable controllers. Compatible with Allen-Bradley PLC-3 programmable controllers. Integrates with PLC-5 and PLC-5/20 processor systems over Remote I/O links.
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
What controllers are compatible with the Allen-Bradley 1791-0A16?
The 1791-0A16 connects to legacy PLC-2, PLC-3, PLC-5/20, and PLC-5 programmable controllers over remote I/O networks.
What is the output current capacity for the 1791-0A16 block?
Current capacity depends on orientation and ambient temperature. Vertical mounting supports up to 600 mA at 30 degrees Celsius. Vertical mounting supports 300 mA at 60 degrees Celsius. Horizontal mounting allows up to 300 mA at 30 degrees Celsius. Horizontal mounting allows 150 mA at 60 degrees Celsius.
What wire specifications are required for field signal connections?
Field wiring requires 14 AWG stranded wire conductors. Maximum insulation thickness must not exceed 3/64 inches.
What is the indicative market pricing for the 1791-0A16 module?
Market pricing is indicative reference pricing only and not a final quotation. Final quotation depends on supplier stock, unit condition, destination, and delivery terms.
