1771-KE | Allen Bradley PLC 5 Communication Controller Module

Product Overview

The Allen Bradley 1771-KE functions as a high-performance communication interface within the PLC-5 chassis. It bridges the gap between the Data Highway (DH) network and asynchronous RS-232-C devices, enabling seamless data exchange between controllers, computers, and intelligent peripherals. This specific unit arrives 100% Brand New and features a conformal coating, providing superior protection against harsh industrial atmospheres.

Technical Specifications

The 1771-KE module utilizes a rack-mountable design and draws power directly from the PLC backplane, eliminating the need for external power supplies.

Engineering Advantages

• Protocol Conversion Mastery: The 1771-KE converts Data Highway protocol into standard RS-232-C serial data. This allows legacy PLC-5 systems to communicate with modern diagnostic laptops, printers, and third-party HMI hardware without requiring expensive network overhauls.

• Extreme Environment Resilience: The conformal coating shields the internal circuitry from moisture, dust, and corrosive chemical vapors. This hardware hardening ensures the module maintains 91.2 kilobaud transmission speeds even in facilities with high humidity or airborne contaminants.

• Simplified Integration: The module occupies a single slot in any 1771 I/O chassis. Because it requires zero external power sources, it reduces cabinet heat load and simplifies the wiring architecture within the control enclosure.

• Predictable Signal Timing: With a typical DC signal delay (Off) of 50 ms and an AC delay of 45 ms (+/- 15 ms), the 1771-KE provides the deterministic timing necessary for synchronized data collection across a distributed network.

FAQs

• Does the 1771-KE require a separate power supply?

  No. The module draws its required 1.2 Amperes directly from the 1771 chassis backplane. However, you must verify that your chassis power supply has sufficient headroom to accommodate the 750mA backplane current draw of this module alongside other installed I/O.

• How does the conformal coating benefit my installation?

  The conformal coat is a specialized thin polymer film applied to the PCB. It protects the 1771-KE against "dendrite growth" and short circuits caused by moisture or salt spray, making it the ideal choice for wastewater, pulp and paper, or coastal industrial sites.

• Which wiring arm should I use for this module?

  The 1771-KE requires the 1771-WH wiring arm. Using the correct arm ensures secure terminal connections and facilitates the "swing-away" design for fast module replacement without disconnecting individual field wires.

• Can this module interface with Data Highway Plus (DH+)?

  The 1771-KE is specifically designed for the standard Data Highway protocol. For Data Highway Plus (DH+) applications, engineers typically utilize the 1770-KF2 or similar bridge modules, though the 1771-KE remains the industry standard for original Data Highway to RS-232-C conversion.