PRODUCT INFORMATION
Product Overview
The Allen-Bradley 1771-OFE1 is an Analog Output Module for the PLC-5 series. It converts 12-bit binary or 4-digit BCD data into analog voltage signals across 4 isolated differential channels. Selectable output ranges include 1 to 5 V DC, 0 to 10 V DC, and -10 to +10 V DC. The module drives field devices such as control valves, drives, dampers, and positioners. It operates within a standard Bulletin 1771 I/O chassis.
Data transfer between the PLC-5 processor and the 1771-OFE1 uses block transfer programming. A write block transfer moves up to 13 words for digital-to-analog conversion. A read block transfer moves 5 words for diagnostic checks and calibration data. The digital-to-analog converter features a settling time of 0.8 ms for resistive loads. Power dissipation reaches a maximum of 7.9 W with a backplane current draw of 1.5 A.
TECHNICAL DATA
Technical Specifications
| Parameter | Specification |
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| Category | PLCs |
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| Product Line | PLC 5 |
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| UPC | 612598003051 |
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| Weight | 1.75 lbs (0.79 kg) |
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| Module Type | Analog output module |
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| Number of Inputs & Outputs | 4 Isolated (1000 Volt) Differential |
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| Data Format | BDC or Natural Binary |
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| No. of channels | Four (4) isolated channels |
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| Output signal | +/- 10 VDC |
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| Voltage Range | 1-5 V dc, 0-10 V dc, +/- 10 V dc |
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| Output signal ranges | +1 to +5 VDC; -10 to +10 VDC and 0 to +10 VDC |
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| Module resolution | 12 bits |
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| Backplane Current | 1.5 Miliamperes |
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| Accuracy | +0.1% of full scale; +1/2 Least Significant Digit (LSD) in BCD; +1/2 Least Significant Bit (LSB)in Binary mode |
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| Required External Power | None |
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| Converter setting time | 0.8 ms |
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| Wiring Arm | 1771-WH |
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| Internal scan rate | 8.0 ms |
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| Backplane power consumption | 1.50 Amperes |
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| Typical AC Signal Delay (Off) | 45 (+/- 15) ms |
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| Maximum Power dissipation | 7.9 Watts |
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| Typical DC Signal Delay (Off) | 50 ms |
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| Thermal Dissipation | 26.9 BTU/Hr |
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| Compatible chassis | 1771 I/O |
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| Mounting | Rack Mountable |
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TECHNICAL INFORMATION
Features
- Provides 4 individually isolated differential voltage output channels.
- Supports selectable output ranges of 1-5 V DC, 0-10 V DC, and ±10 V DC.
- Delivers 12-bit digital resolution with an overall accuracy of ±0.1% full scale.
- Settles resistive loads within 0.8 ms during digital-to-analog conversion.
- Updates 4 channels in 1.6 ms using Natural Binary data formatting.
- Includes built-in short circuit protection on every analog output channel.
TECHNICAL INFORMATION
Applications
- Modulating control valves and pneumatic damper positioners.
- Providing analog speed reference signals to variable frequency drives.
- Driving analog signal inputs on panel meters, totalizers, and data loggers.
- Interfacing with external single-loop process controllers and signal converters.
TECHNICAL INFORMATION
Connections / Interfaces
- Field connections land on removable wiring arm 1771-WH or 1771-WC.
- The wiring arm disconnects without removing field wiring during module replacement.
- Keying bands secure proper chassis location between pins 10-12 and 26-28.
TECHNICAL INFORMATION
Installation Guidelines
- Insert the module into any available slot of a Bulletin 1771 I/O chassis.
- Snap chassis keying bands between pins 10-12 and 26-28 before insertion.
- Ensure system power is switched off before seating or removing the module.
- Tighten wiring terminal screws securely to ensure stable electrical connections.
TECHNICAL INFORMATION
Configuration Guidelines
- Configure data format to either Natural Binary or BCD with scaling.
- Implement Write Block Transfer instructions to transfer up to 13 data words.
- Use Read Block Transfer instructions to monitor 5 status words from the module.
TECHNICAL INFORMATION
Compatibility
- Compatible with Allen-Bradley Bulletin 1771 I/O chassis.
- Operates with Allen-Bradley PLC-5 programmable controllers supporting block transfer.
TECHNICAL RESOURCES
Documentation
COMPATIBILITY
Compatibility & Replacement
COMPATIBLE MODELSCompatible with Allen-Bradley Bulletin 1771 I/O chassis. Operates with Allen-Bradley PLC-5 programmable controllers supporting block transfer.
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 primary function of the Allen-Bradley 1771-OFE1?
The 1771-OFE1 converts digital processor values into 4 isolated analog voltage output signals.
What voltage ranges does the 1771-OFE1 support?
It supports 1 to 5 V DC, 0 to 10 V DC, and -10 to +10 V DC.
What wiring arm is required for the 1771-OFE1 module?
The module uses the 1771-WH or 1771-WC wiring arm for field wiring connections.
What is the reference market price for the 1771-OFE1?
Observed market reference pricing is approximately $168.00 USD for surplus units. This figure is an indicative market reference only and not a final quotation.
