1785-KE

Overview of Allen-Bradley 1785-KE Data Highway Plus Communication Interface Module

The Allen-Bradley 1785-KE is a Data Highway Plus (DH+) communication interface module designed for use in a 1771 I/O chassis. It provides one DH+ port for network connectivity and one RS-232-C port for point-to-point communication. The module facilitates communication between PLC controllers and other DH+ and RS-232 devices, supporting speeds up to 57,600 bps on DH+ and configurable speeds on RS-232.

Key Features of 1785-KE

• One DH+ communication port and one RS-232-C communication port.
• Compatible with Allen-Bradley PLC-2, PLC-3, PLC-4, and PLC-5 controllers.
• Supports half-duplex and full-duplex communication.
• Supports DH+ communication speeds of up to 57,600 bps and RS-232 speeds from 110 to 19,200 bps (switch selectable).
• Conformal coating for added environmental protection.
• Operates from 1.2 Amperes at 5 V DC power drawn from the backplane.
• Mounts in a 1771 I/O chassis.
• Typical AC signal delay (off) ~29 ms, DC signal delay (off) ~30 ms.
• Compatible cabling includes 1770-CD for DH+ and 1770-CG or 1770-CP for RS-232 connections.
• Supports up to 4 modules per DH+ network system.
• Operating temperature: 0 to 60 °C (32 to 140 °F); Storage temperature: -40 to 85 °C (-40 to 185 °F).

Technical Specifications

Applications / Use Cases

The 1785-KE module is suitable for integrating RS-232 devices with Allen-Bradley Data Highway Plus networks in industrial automation systems. It's commonly used for connecting legacy PLCs and devices in manufacturing, process control, and other automation applications requiring reliable serial and network communications.