PRODUCT INFORMATION
Product Overview
The Allen-Bradley 1771-ASC is a PLC-5 Remote I/O Adapter Module designed for remote chassis communication. It mounts in the leftmost slot of a standard 1771 I/O chassis. The module establishes a serial interface between a central controller and remote I/O racks. It communicates across Belden 9463 or 1770-CD cable at selectable speeds up to 230.4 kbit/s.
The 1771-ASC draws 1.0 Ampere of backplane current at 5 Volts DC. Total thermal dissipation equals 17.06 BTU per hour with 3 Watts power consumption. The unit includes conformal coating and operates across a temperature range of 0 to 60 degrees Celsius. It features an integrated 1771-WB wiring arm to support field connections.
TECHNICAL DATA
Technical Specifications
| Parameter | Specification |
|---|
| Product Line | PLC 5 |
|---|
| Weight | 2.00 lbs (0.91 kg) |
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| Module Type | Remote I/O Adaptor Module |
|---|
| Rate of Communication | 57.6 kbit/s |
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| Wiring Arm | 1771-WB |
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| Connectors | Wiring Arm 1771-WB |
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| Backplane Current (at 5 Volts) | 1.0 Amperes |
|---|
| Cable | Belden 9463 |
|---|
| Communication Rate | 57.6K and 115.2K baud |
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| Communication Port | Remote I/O (RIO) |
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| Operating Temperature | 32°F to 140°F (0°C to 60°C) |
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| Mounting | In-Chassis |
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| Coating | Conformal Coat |
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| Storage Temperature | -40°F to +185°F (-40°C to +85°C) |
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| Slot grouping | 2-Slot addressing only |
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| Swingarm | Included |
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| Status Indicators | ACTIVE, ADAPTER FAULT, and I/O RACK FAULT |
|---|
| Product Lifecycle | Discontinued |
|---|
TECHNICAL INFORMATION
Features
- Serial communication interface connecting remote 1771 chassis to a PLC-5 scanner.
- Selectable transmission rates of 57.6k, 115.2k, and 230.4k baud.
- Front panel LED indicators for Active, Adapter Fault, and I/O Rack Fault.
- Conformal coating providing protection in harsh industrial environments.
- Factory-installed 1771-WB field wiring swingarm for wiring termination.
- Supports 1/2-slot, 1-slot, and 2-slot addressing configurations.
TECHNICAL INFORMATION
Applications
- Remote I/O rack expansion for PLC-5 automation systems.
- Distributed digital and analog signal acquisition over long cable distances.
- Industrial control architectures requiring conformal-coated communication hardware.
TECHNICAL INFORMATION
Connections / Interfaces
- Connects to remote I/O link using standard Belden 9463 twinaxial cable.
- Terminates field wiring via the integral 1771-WB swingarm connector.
- Interfaces to the 1771 chassis backplane through keyed card-edge connections.
TECHNICAL INFORMATION
Installation Guidelines
- Install the module strictly into the leftmost slot of the 1771 chassis.
- Key the upper backplane connector between pins 54 and 56.
- Key the lower backplane connector between pins 16 and 18.
- Secure field wiring to the 1771-WB arm using 7 to 9 pound-inches torque.
- Maintain ambient operating temperatures between 0 and 60 degrees Celsius.
TECHNICAL INFORMATION
Configuration Guidelines
- Configure network baud rate and chassis rack numbers using onboard DIP switches.
- Terminate the communication line with either an 82-ohm or 150-ohm resistor.
- Select addressing modes including 1/2-slot, 1-slot, or 2-slot modes.
- Execute data transfers with discrete and analog modules using BTW and BTR instructions.
TECHNICAL INFORMATION
Compatibility
- Mounts directly into standard Allen-Bradley 1771 I/O chassis.
- Interfaces with 4, 6, 8, 16, and 32-channel discrete and analog modules.
- Connects to central PLC-5 scanners via Belden 9463 or 1770-CD cable.
TECHNICAL INFORMATION
Lifecycle / Replacement Information
- The Allen-Bradley 1771-ASC module has reached discontinued lifecycle status from the manufacturer.
- Units remain available in the secondary market as refurbished hardware for maintenance support.
TECHNICAL INFORMATION
Compliance and Certifications
TECHNICAL RESOURCES
Documentation
COMPATIBILITY
Compatibility & Replacement
COMPATIBLE MODELSMounts directly into standard Allen-Bradley 1771 I/O chassis. Interfaces with 4, 6, 8, 16, and 32-channel discrete and analog modules. Connects to central PLC-5 scanners via Belden 9463 or 1770-CD cable.
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 1771-ASC module?
The 1771-ASC interfaces a 1771 remote I/O chassis with a central PLC-5 scanner via serial communication.
Which slot position does the 1771-ASC require in a chassis?
The module must install exclusively in the leftmost slot of the 1771 I/O chassis.
What communication baud rates does the 1771-ASC support?
The module supports transmission speeds of 57.6k, 115.2k, and 230.4k baud across approved twinaxial cable.
What is the market reference price for the 1771-ASC?
Observed market reference pricing is approximately $158.00 USD for refurbished units. Pricing is indicative only and not a final quotation.
