At a Glance

We would like to read a character string sent by a data entry/display terminal connected to a Modicon M340 processor’s serial port.

This character string is stored in the Str variable, the management table of the communication function being gestion.

Illustration

A Modicon M340 PLC is linked to a data entry/display terminal TM8501:

Programming

Programming in ST:

IF (%M15) THEN
   INPUT_CHAR(ADDM(’0.0.0’), 1, 0, gestion, Str);
END_IF;

Request parameters:

Parameters

Description

ADDM(‘0.0.0’)

  • 0 : rack

  • 0 : module

  • 0 : channel 0

  • SYS: system address (optional on Modicon M340 PLCs)

1

Reset

0

Read the entire character string

gestion

Management table

Str

Variable of type STRING that is to receive the message