PRODUCT INFORMATION
Product Overview
The Allen-Bradley 1771-OM is an eight-output PLC-5 Digital Output Module designed for 1771 I/O chassis installations. It features eight fused AC Triac outputs operating across a voltage range of 184 to 250 Volts AC. The supported operational line frequency spans from 47 to 63 Hertz. Each individual output handles up to 2 Amperes of continuous current. The combined continuous current across the entire module must not exceed 6 Amperes.
The module draws 225 milliamperes of backplane current at 5 Volts DC from the chassis backplane. Outputs require a minimum load current of 60 milliamperes at 220 Volts AC to remain conducting. At 220 Volts AC, maximum off-state leakage current is 2 milliamperes per output. Thermal dissipation reaches 45.1 BTU per hour, with total module power dissipation rated at 13.2 Watts. The internal module circuitry consists of 14 AWG stranded wire with 3/64-inch thick insulation.
TECHNICAL DATA
Technical Specifications
| Parameter | Specification |
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| Category | PLCs |
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| Product Line | PLC 5 |
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| Weight | 0.69 lbs (0.31 kg) |
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| Module Type | Digital AC Output Module |
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| Number of Outputs | 8 Outputs |
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| Voltage Category | 220 Volts AC |
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| AC Operating Voltage | 184-250 Volts |
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| Backplane Current | 225 Miliamperes |
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| Max Continuous Current Per Output | 2 Amperes |
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| Max Current Per Module | 6 Amperes |
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| Wiring Arm | 1771-WH |
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| Model Status | Earlier Model |
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| Coating | Conformal Coat |
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| Typical AC Signal Delay (Off) | 45 (+/- 15) ms |
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| Typical DC Signal Delay (Off) | 50 ms |
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| Mounting | Rack Mountable |
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TECHNICAL INFORMATION
Features
- Provides eight fused AC Triac outputs for 220 Volts AC systems.
- Delivers up to 2 Amperes continuous current per output channel.
- Limits total module current across all channels to 6 Amperes.
- Withstands surge currents of 20 Amperes per output for 100 milliseconds.
- Includes individual 2 Ampere, 250 Volt 3AG normal blow fuses.
- Features conformal coating for circuit protection.
TECHNICAL INFORMATION
Connections / Interfaces
- Connects directly into any slot within a standard 1771 I/O chassis.
- Compatible with 1771-WH and 1771-WA field wiring arms.
- Field wiring arm terminal screws require a tightening torque between 7 and 9 inch-pounds.
- Internal circuitry uses 14 AWG (2 mm²) stranded wire with 3/64-inch (1.2 mm) insulation.
TECHNICAL INFORMATION
Installation Guidelines
- Mount the module into any available slot of the 1771 I/O chassis.
- Set chassis keying bands between pins 6 to 8 and pins 28 to 30.
- Torque field wiring arm terminal screws between 7 and 9 inch-pounds.
- Operate the unit in ambient temperatures between 0 and 60 degrees Celsius.
- Maintain ambient non-condensing relative humidity between 5 and 95 percent.
TECHNICAL INFORMATION
Configuration Guidelines
- Verify that connected loads draw at least 60 milliamperes at 220 Volts AC.
- Maintain total continuous module current at or below 6 Amperes across all outputs.
- Ensure operating voltage remains between 184 and 250 Volts AC at 47 to 63 Hertz.
TECHNICAL INFORMATION
Compatibility
- Compatible with Allen-Bradley 1771 I/O chassis.
- Operates in Allen-Bradley PLC-5 control systems.
- Connects with 1771-WH and 1771-WA field wiring arms.
TECHNICAL INFORMATION
Lifecycle / Replacement Information
- Classified as an earlier model in the PLC-5 product line.
- Output circuits use replaceable 2 Ampere, 250 Volt 3AG normal blow fuses.
TECHNICAL INFORMATION
Compliance and Certifications
- UL Listed
- CSA Certified
- CE Marked
TECHNICAL RESOURCES
Documentation
COMPATIBILITY
Compatibility & Replacement
COMPATIBLE MODELSCompatible with Allen-Bradley 1771 I/O chassis. Operates in Allen-Bradley PLC-5 control systems. Connects with 1771-WH and 1771-WA field wiring arms.
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 is the continuous current rating of the 1771-OM?
Each output supports up to 2 Amperes. Total current for the module cannot exceed 6 Amperes.
What minimum load current is required for operation?
The Triac outputs require at least 60 milliamperes at 220 Volts AC to stay conducting.
Which wiring arms work with the 1771-OM module?
The module is compatible with 1771-WH and 1771-WA field wiring arms.
What fuses protect the 1771-OM outputs?
Each output circuit contains a 2 Ampere, 250 Volt 3AG normal blow fuse.
