PRODUCT INFORMATION
Product Overview
The Allen-Bradley 1771-M3 is a PLC-5 Controller Module designed for single-axis motion control. It operates as a dedicated component within the Series B servo positioning assembly. The module coordinates block transfer operations directly to minimize supervisory PLC ladder programming. It transmits axis motion commands to a paired 1771-ES expander module across the system. The unit provides high-speed positioning with a fixed servo sample period of 2 milliseconds.
The controller module installs directly into a single slot of any standard 1771 I/O chassis. Keying pins between contacts 2-4 and 8-10 secure proper slot orientation. Electrical isolation is maintained up to 10V DC maximum on the analog drive output. A signed 12-bit digital-to-analog converter generates the motion command signals. The module features conformal coating to withstand challenging industrial environments during operation.
TECHNICAL DATA
Technical Specifications
| Parameter | Specification |
|---|
| Backplane Current | 1.75 Amperes |
|---|
| Category | PLCs |
|---|
| Coating | Conformal Coat |
|---|
| Module Type | Servo Controller Module |
|---|
| Mounting | Rack Mountable |
|---|
| Product Line | PLC 5 |
|---|
| Slots | 1 Slot |
|---|
| Typical AC Signal Delay (Off) | 45 (+/- 15) ms |
|---|
| Typical DC Signal Delay (Off) | 50 ms |
|---|
| Weight | 1.31 lbs (0.60 kg) |
|---|
| Wiring Arm | 1771-WH |
|---|
TECHNICAL INFORMATION
Features
- Dedicated servo sample period of 2 milliseconds for deterministic loop closure.
- Supports differential encoder input rates up to 250 kHz.
- Accommodates single-ended encoder input signals up to 20 kHz.
- Tachometer input rated for up to 50V DC across a 20 kilohm impedance.
- Drive disable output handles up to 100 mA sinking or sourcing current at 30V DC.
- Signed 12-bit digital-to-voltage converter providing up to 10V DC isolated output.
- Conformal coating applied to circuit assemblies for environmental protection.
TECHNICAL INFORMATION
Applications
- Single-axis closed-loop servo positioning in Allen-Bradley PLC-5 automation systems.
- Machine axis motion control utilizing 1771-ES expander modules.
- High-speed encoder feedback processing for industrial manufacturing equipment.
TECHNICAL INFORMATION
Connections / Interfaces
- Top backplane chassis keying between pins 2 to 4 and pins 8 to 10.
- Field wiring terminates via standard 1771-WH or 1771-WI wiring arms.
- Interface connection dedicated to 1771-ES expander module communication.
TECHNICAL INFORMATION
Installation Guidelines
- Insert the module into a single slot of a 1771 chassis.
- Ensure backplane keying bands align with pins 2-4 and 8-10.
- Verify total backplane power capacity covers the 1.75 A current draw.
- Maintain ambient operating temperatures between 0 and 60 °C.
TECHNICAL INFORMATION
Configuration Guidelines
- Configure discrete input switch selection for either 11.2k or 1.2k impedance.
- Program axis parameters with a maximum positioning boundary of 19999.999 mm.
- Set the loop acceleration and deceleration parameters up to 99.99 mpm/s.
TECHNICAL INFORMATION
Compatibility
- Compatible with Allen-Bradley 1771 I/O chassis assemblies.
- Pairs directly with 1771-ES expander modules for axis motion control.
- Uses 1771-WH and 1771-WI wiring arms for field terminations.
TECHNICAL RESOURCES
Documentation
COMPATIBILITY
Compatibility & Replacement
COMPATIBLE MODELSCompatible with Allen-Bradley 1771 I/O chassis assemblies. Pairs directly with 1771-ES expander modules for axis motion control. Uses 1771-WH and 1771-WI wiring arms for field terminations.
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-M3?
The 1771-M3 controls single-axis motion in a PLC-5 system. It automates block transfers to reduce ladder programming overhead.
What are the encoder input limits for the 1771-M3 module?
The module supports differential encoder inputs up to 250 kHz. Single-ended encoder signals are supported up to 20 kHz.
What backplane current does the 1771-M3 draw?
The module draws 1.75 Amperes from the 1771 chassis backplane power supply.
What is the reference price for a replacement 1771-M3 module?
Market reference pricing is approximately $348.00 USD for refurbished units. Pricing is indicative only; final quotation depends on condition and stock.
