Fieldbus coupler / controller • 17
Fieldbus coupler 750-342
Modular I/O System
ETHERNET TCP/IP
3 Fieldbus coupler / controller
3.1 Fieldbus coupler 750-342
This chapter includes:
3.1.1
Description ..................................................................................... 18
3.1.2
Hardware ........................................................................................ 19
3.1.2.1
View......................................................................................... 19
3.1.2.2
Device supply .......................................................................... 20
3.1.2.3
Fieldbus connection ................................................................. 20
3.1.2.4
Display elements...................................................................... 21
3.1.2.5
Configuration interface ............................................................ 21
3.1.2.6
Hardware address (MAC-ID) .................................................. 21
3.1.3
Operating system ............................................................................ 22
3.1.4
Process image ................................................................................. 23
3.1.4.1
Example of a process input image ........................................... 24
3.1.4.2
Example of a process output image ......................................... 25
3.1.4.3
Process data architecture for MODBUS/TCP ......................... 26
3.1.5
Data exchange................................................................................. 31
3.1.5.1
Memory areas .......................................................................... 32
3.1.5.2
Addressing ............................................................................... 32
3.1.5.3
Data exchange between MODBUS master and I/O modules .. 34
3.1.6
Starting up ETHERNET TCP/IP fieldbus nodes............................ 35
3.1.6.1
Note the MAC-ID and establish the fieldbus node.................. 35
3.1.6.2
Connecting PC and fieldbus node............................................ 35
3.1.6.3
Determining IP addresses ........................................................ 36
3.1.6.4
Allocating the IP address to the fieldbus node ........................ 36
3.1.6.5
Testing the function of the fieldbus node ................................ 39
3.1.6.6
Reading out the information as HTML pages.......................... 40
3.1.7
LED Display ................................................................................... 41
3.1.7.1
Blink code................................................................................ 41
3.1.7.2
Fieldbus status ......................................................................... 42
3.1.7.3
Node status............................................................................... 42
3.1.7.4
Fault message via blink code from the I/O-LED ..................... 43
3.1.8
Fault behavior ................................................................................. 45
3.1.8.1
Fieldbus failure ........................................................................ 45
3.1.8.2
Internal bus fault ...................................................................... 45
3.1.9
Technical Data................................................................................ 46