List of contents for register 2

1

WAGO-I/O SYSTEM .................................................................

1

1.1

Components ..................................................................................................

1

1.2

Installation....................................................................................................

2

1.3

Methods of decentralisation ........................................................................

6

2

MODBUS Coupler/Controller...................................................

9

2.1

Hardware......................................................................................................

9

2.2

Power supply ................................................................................................

10

2.2.1

Electronic supply voltage...............................................................................

11

2.2.2

Supply voltage of the field side......................................................................

12

2.3

Station address .............................................................................................

13

2.4

Mode switch..................................................................................................

14

2.5

Fieldbus connection .....................................................................................

15

2.5.1

RS 485............................................................................................................

15

2.5.2

RS 232............................................................................................................

18

3

Technical data .............................................................................

19

3.1

Dimensions....................................................................................................

19

3.2

Coupler .........................................................................................................

20

3.3

Controller .....................................................................................................

21

4

MODBUS .....................................................................................

23

5

Configuration ..............................................................................

25

5.1

Coupler .........................................................................................................

25

5.1.1

Settings...........................................................................................................

25

5.1.1.1

Standard settings ............................................................................................

26

5.1.1.2

Baud rate setting ............................................................................................

26

5.1.1.3

Error detection, length of the character string................................................

27

5.1.1.4

End of Frame Time ........................................................................................

28

5.1.1.5

ASCII-/RTU mode.........................................................................................

28

5.1.1.6

Error Check....................................................................................................

29

5.1.1.7

Extended Functions........................................................................................

29

5.1.1.8

Watchdog .......................................................................................................

30

5.1.1.9

Update Firmware ...........................................................................................

30

5.1.2

Data exchange between MODBUS master and I/O modules ........................

31

5.1.3

Addressing the I/O modules...........................................................................

32

5.1.4

Application examples ....................................................................................

33

MODBUS / Introduction

vii

5.2

Controller .....................................................................................................

35

5.2.1

Settings ..........................................................................................................

35

5.2.1.1

Standard settings............................................................................................

36

5.2.1.2

Baud rate setting ............................................................................................

36

5.2.1.3

Error detection, length of character string .....................................................

37

5.2.1.4

End of Frame Time........................................................................................

38

5.2.1.5

ASCII-/RTU mode.........................................................................................

38

5.2.1.6

Error Check....................................................................................................

39

5.2.1.7

Extended Functions .......................................................................................

39

5.2.1.8

Watchdog.......................................................................................................

40

5.2.2

Data exchange between MODBUS master and controller ............................

41

5.2.2.1

Data exchange between MODBUS master and I/O modules ........................

42

5.2.2.2

Data exchange between MODBUS master and PLC functionality ...............

44

5.2.2.3

Data exchange between I/O modules and PLC functionality ........................

45

5.2.2.4

Address review ..............................................................................................

46

5.2.3

Absolute addresses for inputs, outputs and flags...........................................

47

5.2.4

Addressing the I/O modules ..........................................................................

49

5.2.5

Application example......................................................................................

50

5.2.6

Controller operating system...........................................................................

52

5.3

Common coupler/controller functions.......................................................

53

5.3.1

Implemented MODBUS functions ................................................................

53

5.3.1.1

Use of the MODBUS functions.....................................................................

54

5.3.1.2

Read Coil Status ............................................................................................

55

5.3.1.3

Read Input Status...........................................................................................

57

5.3.1.4

Read Holding Register...................................................................................

59

5.3.1.5

Read Input Register .......................................................................................

60

5.3.1.6

Force Single Coil ...........................................................................................

61

5.3.1.7

Preset Single Register ....................................................................................

62

5.3.1.8

Fetch Comm Event Counter ..........................................................................

63

5.3.1.9

Force Multiple Coils......................................................................................

64

5.3.1.10

Preset Multiple Registers...............................................................................

65

5.3.2

Watchdog - Fieldbus failure ..........................................................................

66

5.3.3

Configuration function ..................................................................................

70

5.3.4

Firmware information....................................................................................

71

5.3.5

General registers ............................................................................................

72

6

Start up and Diagnosis ...............................................................

73

6.1

Run up and error indications .....................................................................

73

6.2

MODBUS LED ............................................................................................

75

6.3

Starting up the controller with WAGO-I/O-PRO ....................................

76

viii

MODBUS / Introduction

7

General Conditions....................................................................

79

7.1

Transport and storage conditions .............................................................

79

7.2

Climatic conditions .....................................................................................

79

7.3

Mechanical conditions ................................................................................

80

7.4

Class and degree of protection...................................................................

81

7.5

Specifications and test results ....................................................................

81

7.6

Electromagnetic compatibility ...................................................................

82

MODBUS / Introduction

ix

x

MODBUS / Introduction