Allen-Bradley 1771-KE Communication Controller Module

Product Overview

The Allen-Bradley 1771-KE is a PLC-5 Communication Controller Module that provides serial communication interfaces between PLC-5 controllers and external devices. It features Data Highway and RS-232-C ports for flexible connectivity in legacy PLC-5 automation networks, enabling data exchange with programming terminals, SCADA systems, and other serial devices.

Key Specifications

• Product Type: Communication Controller Module
• System Platform: PLC-5 / 1771 I/O
• Communication Ports: Data Highway and RS-232-C
• Processor Port Speed: 91.2 kilobaud
• Backplane Current: 750 mA
• Power Requirement: 1.2 A at 5 VDC
• Power Consumption: Approx. 6 W at 5 VDC
• Wiring Arm: 1771-WH
• Mounting: Rack mountable (1771 chassis)
• Coating: Conformal coat
• Weight: 2.79 lbs (1,266 g)

Features & Benefits

• Dual Communication Interfaces: Data Highway port for PLC-5 network connectivity and RS-232-C for direct serial device connection
• High-Speed Data Exchange: 91.2 kbps processor port enables rapid data transfer between controller and external systems
• Backplane Integration: Directly interfaces with PLC-5 backplane for seamless module-to-module communication
• Conformal Coating: Protects circuitry from moisture, dust, and industrial contaminants
• Standard Wiring Arm: Uses 1771-WH for consistent installation practices across the 1771 platform

Applications

• PLC-5 programming and diagnostics via Data Highway
• SCADA system integration through RS-232-C serial links
• Printer and peripheral device connectivity
• Legacy system maintenance and expansion
• Data logging and supervisory control interfaces

Installation Guide

1. Chassis Slot Selection: Install the 1771-KE into any available slot in a 1771-series I/O chassis. Verify backplane has adequate 5VDC capacity (1.2A requirement).
2. Wiring Arm Installation: Attach the 1771-WH wiring arm to provide access to Data Highway and RS-232-C terminal connections.
3. Data Highway Connection: Connect the Data Highway port to the PLC-5 network backbone using appropriate cabling (typically 1770-CD).
4. RS-232-C Configuration: Connect serial devices (programming terminals, printers, SCADA interfaces) to the RS-232-C port. Configure baud rate and protocol settings per device requirements.
5. Power Verification: Apply chassis power and verify module status indicators. Check communication integrity with connected devices.

FAQ

Q: Does the 1771-KE require an external power supply?
A: No. The module receives all operating power through the PLC-5 backplane (5VDC, 1.2A).

Q: What is the maximum cable length for RS-232-C connections?
A: Standard RS-232-C limits cable length to approximately 50 feet (15 meters) at 91.2 kbps. Use RS-422/485 converters for longer distances.

Q: Can the 1771-KE communicate with modern Ethernet networks?
A: No. The 1771-KE supports Data Highway and RS-232-C only. For Ethernet connectivity, use the 1771-KG or migrate to ControlLogix with 1756-ENBT/EN2T modules.

Q: What is the difference between 1771-KE and 1771-KF?
A: The 1771-KF is an enhanced communication module with additional features. Verify specific application requirements when selecting between models.

Selection Tips

• Verify total backplane current budget before adding the 1771-KE (1.2A at 5VDC)
• Confirm Data Highway network topology compatibility with existing infrastructure
• For RS-232-C connections, ensure cable length stays within specification
• Consider 1771-KG for applications requiring additional communication features
• Plan migration path to ControlLogix Ethernet-based communication for future-proofing