OVERVIEW

Official designation: Allen-Bradley 1775-KA (PLC-3, Data Highway Communication Adapter Module)

Role/Application: This module enables the PLC-3 processor to communicate on the Data Highway network, supporting peripheral devices and offering an RS-232-C interface for programming and reporting functions.

KEY SPECS SUMMARY

Power: 3.5 Watts

Interfaces / Ports: One Data Highway port, one RS-232-C

Indicators: XTMG, RCVG, ERR, DIS LEDs, and self-test

Operating Temp: 0 to 60 degrees C

Platform / Compatibility: PLC-3 main or expansion chassis

Limit: Trunkline maximum length 10000 feet

Lifecycle: Discontinued/Obsolete

FREQUENTLY ASKED QUESTIONS

Technical Specifications:

Q: What is the required input voltage and frequency range for the 1775-KA module operation?

A: The module requires 115 Volts at 60 Hertz or 230 Volts at 50 Hertz for operation.

Wiring & Installation:

Q: What type of cable is required for the Data Highway trunkline connection to the 1775-KA module?

A: The Data Highway trunkline requires the use of twinaxial cable for connection.

Troubleshooting & Compatibility:

Q: What is the primary purpose of the four LED indicators on the front panel of the 1775-KA module?

A: The LEDs indicate transmit timing, receiving status, error conditions, or disabled status.

Replacement & Upgrades:

Q: What is the current recommended migration path for replacing the obsolete PLC-3 system including the 1775-KA module?

A: The current recommendation for full system migration is to the modern Allen-Bradley ControlLogix platform.