ABB CI853A AF100 Communication Interface

The CI853 RS-232 module supports communication protocols COMLI and MODBUS RTU, designed for flexible serial communication in industrial automation systems. It can operate in both master and slave modes and supports hot swapping for easy replacement without downtime.

Communication Protocols

• COMLI:

• Used on built-in COM3 port and optionally on CI853 ports

• RS-232C standard interface for serial communication

• ABB proprietary asynchronous master/slave protocol in half-duplex mode

• Supports dial-up modems controlled from the application

• Operates in both Master and Slave modes

• Communication distances can be extended using fiber optic converters

• MODBUS RTU:

• Widely used open serial protocol over RS-232 or RS-485

• Half-duplex Master/Slave communication

• Configurable on COM ports of AC 800M and CI853 modules

• Module redundancy not supported

• Supports only Master mode on CI853

Additional Supported Protocols

• Siemens 3964R: Supported on built-in COM3 and optionally CI853 ports; requires standard RS-232C/485 communication channel

• Self-defined Serial Communication: Usable on built-in COM3 (AC 800M Controller) and optionally on CI853 ports

Features and Benefits

• COMLI protocol for reliable data transmission between controllers with support for hot swap

• MODBUS RTU protocol for broad compatibility and ease of use in serial communication

• Support for Siemens 3964R and self-defined serial communication increases versatility

• Hot swap capability allows module replacement without system shutdown