Allen-Bradley 1770-KF2 | PLC-5 Series | Data Highway Plus Communication Interface

Product Overview

The 1770-KF2 (Part Number 1770-KF2) is a versatile asynchronous communication interface designed to bridge the gap between intelligent RS-232-C or RS-422-A devices and the Allen-Bradley Data Highway (DH) or Data Highway Plus (DH+) networks. This module acts as a protocol converter, allowing minicomputers, industrial terminals, and third-party systems to exchange data with PLC-2, PLC-3, and PLC-5 controllers. It is a standalone unit typically utilized in control room environments for system monitoring and peer-to-peer data synchronization.

Core Technical Specifications

• Network Compatibility: Supports both Data Highway and Data Highway Plus (DH+) protocols

• Asynchronous Interface: Selectable RS-232-C or RS-422-A communication

• Data Rates: 57.6 kbps for DH/DH+ peer links; 110 to 9600 bps for asynchronous serial connections

• Input Power: Dual-voltage support at 115 VAC or 230 VAC, drawing approximately 0.3 A

• Frequency Range: 50/60 Hz single-phase AC

• Physical Construction: Tabletop or shelf-mount enclosure for controlled environments

• Unit Weight: 6.00 lbs (2.72 kg)

Detailed Port Configuration

• Peer Communication Link: 15-pin male EIA D-shell connector for primary network integration

• Network Monitor Port: 9-pin female EIA D-shell connector for diagnostic monitoring

• Asynchronous Link: 25-pin male EIA D-shell connector for RS-232-C or RS-422-A hardware interfacing

Environmental and Operating Parameters

• Operating Temperature: 32°F to 113°F (0°C to 45°C)

• Storage Temperature: -40°F to 185°F (-40°C to 85°C)

• Relative Humidity: 10% to 80% non-condensing atmosphere

• Mounting Requirements: Horizontal placement in a clean, dust-free enclosure or office setting

Application Scenarios

The 1770-KF2 is frequently deployed in legacy industrial systems where a PC-based HMI or a Unix-based minicomputer requires access to the PLC memory map. It is particularly effective for bridging newer supervisory systems with older 1771-KG or 1775-KA based networks, facilitating phased system upgrades without replacing existing cabling.

Frequently Asked Questions

Q: Can the 1770-KF2 be used as a direct replacement for a 1770-KF3?A: No. While similar, the 1770-KF3 is specifically designed for DH-485 networks, whereas the 1770-KF2 is exclusively for Data Highway and Data Highway Plus networks.

Q: Does this module require internal configuration via jumpers?A: Yes, users must set internal DIP switches and jumpers to define the protocol (DH or DH+), station address, and baud rate for the asynchronous serial link.