| Brand | Allen-Bradley |
| Series | 1771 / PLC-5 |
| Status | Discontinued / Legacy Support |
| Function | Network Master for PLC-5 |
| Humidity | 5% to 95% Non-Condensing |
| Mounting | 1771 I/O Chassis Slot |
| Connector | Field Wiring Arm |
| Part Number | 1771-SPI |
| Manufacturer | Rockwell Automation |
| Product Type | Protocol Interface Module |
| Baud Rate Range | 1200 to 19200 bps |
| Backplane Current | 1.3 A @ 5 V DC |
| Communication Mode | Half Duplex Asynchronous |
| Protocols Supported | IEEE Floating Point, Block Data Transfer |
| Storage Temperature | -40 to 85°C |
| Slave Device Support | Up to 32 Devices |
| Operating Temperature | 0 to 60°C |
| Communication Interface | RS-485 Multi-drop Serial Port |
Does the Allen-Bradley 1771-SPI come with a warranty?
Yes. The 1771-SPI is backed by our 24-Month Replace Industrial Warranty, with no rush fees or hidden warranty charges. If a unit fails under normal use within the warranty period, we repair or replace it.
Is this 1771-SPI a genuine Allen-Bradley part?
The 1771-SPI is sourced and verified independently. Replace Industrial, LLC is not a Rockwell Automation Authorized Distributor, and all warranties are provided directly by Replace Industrial.
Is the Allen-Bradley 1771-SPI new or used?
We offer the 1771-SPI in multiple conditions, from unused surplus to professionally reconditioned units. Every option is sourced and verified independently and covered by our 2-year replacement warranty.
What are the key ratings of the 1771-SPI?
The 1771-SPI operates across 0 to 60°C.
What is the Allen-Bradley 1771-SPI?
The 1771-SPI is an Allen-Bradley PLC-5 Protocol Interface Module.
1771-SPI
The Allen-Bradley 1771-SPI is a protocol interface module designed for PLC-5 systems, acting as a network master to control data exchange between the PLC-5 processor and up to 32 slave devices. Compatible with any slot in the 1771 I/O chassis, it draws 1.3A of current at 5V DC through the backplane. Communication is handled via an RS-485 multi-drop serial port paired with a Field Wiring Arm connector, operating in half-duplex asynchronous mode with speeds from 1200 to 19200 bps. The module supports IEEE floating-point formats and Block Data Transfer protocols, providing reliable data handling in industrial environments. It operates within a temperature range of 0 to 60°C and can tolerate up to 95% non-condensing humidity, with a non-operational temperature tolerance from -40 to 85°C.
All products are covered by our 2-Year (24-Month) Replace Industrial Warranty. If a unit is found defective under normal use within the warranty period, we repair or replace it at no additional cost, and a unit may be returned for a full refund within 30 days if returned in the same condition it was sent.
Replace Industrial is an independent distributor and does not convey the manufacturer's warranty; all warranties are provided by Replace Industrial alone. Read the full warranty policy
We repair a wide range of industrial automation equipment, including PLCs, HMIs, drives, servo motors, switches, and circuit breakers, with rush service for critical downtime. Request a quote, ship your unit, and we diagnose, repair, and return it. Request a repair quote
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