LAN Configuration

The S7/MPI-LAN sends only data when something is recieved on the open TCP/IP
Socket on Port 133 (regardless of the length).
Press now the -Key several times, then the S7/MPI-LAN will response with
some data:
The Structure of the recieved data is descriped in the next table::
Data Description
30h
30h
31h
00h
32h
35h
35h
00h
Parity – Counter as ASCII-Text, including leading Zeros and ending ‚\0’
here „001“
Spike - Counter as ASCII-Text, including leading Zeros and ending ‚\0’
here „255“
01h Binary Parity – Counter (8 Bit)
FFh Binary Spike - Counter (8 Bit)
On the MEGA-ToolBox CD is also a console-application including source which
shows an example of access to S7/MPI-LAN.
// WDTest.cpp : Definiert den Einsprungpunkt für die Konsolenanwendung.
//
#include "stdafx.h"
typedef struct {
unsigned char ucASCIIParity[4]; // Anzahl Paritätsfehler seit letzter Abfrage
// 3 Ziffern mit abschließender '\0'
unsigned char ucASCIISpikes[4]; // Anzahl erkannter Spikes seit letzter Abfrage
// 3 Ziffern mit abschließender '\0',
unsigned char ucBINParity; // Binärwert der Anzahl Paritätsfehler
unsigned char ucBINSpikes; // Binärwert der Anzahl Spikes
} S7LANINFO;
Page 44 Cable and adapter manual © by PI 2008