ABBAdvant® Master S100 I/O system

CI853 RS-232 module protocols:

COMLI can be used on the build in COM3 port and optionally on the

CI853 ports. The cable length can be extended considerably(to

several km) using a fiber optic converter. RS-232C is the standard

communication interface used for serial communication with COMLI.

The CI853 supports Hot Swap. COMLI is an ABB protocol for data

transmission between controllers. Itis designed for asynchronous

master/slave communication in half-duplex. COMLI protocol

supports dial-up modemcontrolled fromthe application. CI853

supports both Master/Slave mode in COMLI.

MODBUS RTU is a standard protocol widely spread because of its

ease of use and reliability.Modbus RTU is an open, serial (RS-232 or

RS-485) protocol derived fromtheMaster/Slave architecture

exchanging information in half duplex mode. TheModbus

functionality can be configured both on the COMports of AC 800M

and CI853.Module Redundancyis not available in MODBUS RTU.

CI853 supports only Master mode in MODBUS RTU.

Features and benefits

COMLI can be used on the build in COM3 port and optionally on the CI853 ports. RS-232C is the

standard communication interface used for serial communication with COMLI. The CI853 supports

Hot Swap. COMLI is an ABB protocol for data transmission between controllers.

MODBUS RTU is an open, serial (RS-232 or RS-485) protocol derived fromtheMaster/Slave

architecture exchanging information in half duplex mode. TheModbus functionality can be configured

both on the COMports of AC 800Mand CI853.

Siemens 3964R can be used on the build in COM3 port and optionally on the CI853 ports. A standard

RS-232C/485 communication channel is required.

Self-defined Serial Communication can be used on the builtin COM3 port(on an AC 800MController)

and optionally on the CI853 ports.

The CI853 module also supports Hot Swap.

General info

Article number 3BSE018103R1 (CI853K01)

Communication protocol COMLI and MODBUS RTU

Master or slave Master / Slave

Number of channels 2

Transmission speed 75 -19 200 b/s

Line redundancy Yes

Module redundancy Yes

Hot Swap Yes

Used together with HI Controller Yes

DATA SHEET CI853 | 2023-04-20 | Copyright© 2023 ABB 1

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S100 I/O system 

For centralized I/O systems and

high-speed applications

On-board processing capabilities

The process I/O modules are “intelligent” in the sense 

that module-related signal and data processing is 

performed on board as opposed to centrally, by the 

CPU of the host controller. Time tagging of events, 

filtering and gain control are some examples of 

board-level tasks. This functional distribution improves 

real-time performance and reliability of the system 

as a whole and maintains processing capacity when 

the system is expanded.

Comprehensive self-diagnostics

Comprehensive self-diagnostics continuously monitor 

the modules and report any errors through LEDs on 

the module fronts and through alarm messages and 

indications to process operator stations. 

Malfunctioning inputs can be disabled and simulated 

by manual entry while failing outputs are deactivated 

or driven to a predetermined safe state automatically. 

All I/O modules can be replaced while the system is in 

service. Some modules can even be arranged, transparently into dually redundant configurations 

forenhanced availability.

High disturbance immunity

All modules conform to the highest standards of 

electromagnetic noise immunity and satisfy the 

requirements of the EU directives 2014/30/EU and 

2014/35/EU. For the above reasons, S100 I/O is likely 

to be the best help you can get for putting your control system in touch with your field devices.