Available Communication Functions

At a Glance

This page describes the available communication functions in Modbus mode.

Available Functions

Four specific communication functions are defined to send and receive data to a master or slave Modbus device:

READ_VAR: reading basic language objects (words, bits, double words, floating points, constant words, system bits and words, timer, monostable, drum) EcoStruxure™ Control Expert, Communication, Block Library
WRITE_VAR: writing basic language objects (words, bits, double words, floating points, constant words, system bits and words) EcoStruxure™ Control Expert, Communication, Block Library
SEND_REQ: exchanging a Modbus request EcoStruxure™ Control Expert, Communication, Block Library
Dialog operator functions: exchanging different specific communication functions in operator dialog (Send_Msg, Send_alarm, Ask_Msg, Ini_Buttons, Control_Leds, Command)

NOTE: The availability of these functions varies with the type of exchanges and hardware versions (see different exchange types).