Siemens 7 Manuel d'utilisateur télécharger pdf (Page 103)

Publication LOGIX-AP008B-EN-P - June 2008 103

Conversion of Typical Program Structures Chapter 4

State Machine

The State Machine is an important construct in control systems software

because it greatly simplifies the task of programming sequential control.

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Simatic S7 to Logix5000 1
Application Conversion Guide 1
Important User Information 2
Table of Contents 3
Chapter 3 4
Conversion versus 7
Translation 7
Terminology 8
Additional Resources 8
PLC Logic Conversion 9
Services Provided by 9
Service Benefits 10
Services Offered 10
Basic Conversion Package 10
Additional Options 11
Preface 12
Hardware Conversion 13
I/O Systems 14
Logix Local I/O 16
S7 Remote I/O 20
Logix Distributed I/O 22
Networks 25
Profinet 26
Networks in Logix 27
Typical Ethernet/IP Example 28
ControlNet Network 29
DeviceNet Network 30
Conversion of HMI 31
Conversion of Systems 32
Containing Distributed 32
Process Control 33
Connecting Siemens and 34
S7 Organization Blocks 36
Compared to Logix Tasks 36
OB1 Program Cycle 37
OB30 – OB38 Cyclic Interrupts 38
Program Structure in STEP 7 40
Tasks in Logix 41
Periodic Tasks 42
Scheduling of Periodic Tasks 43
Event Tasks 45
Task Monitor 46
Tags Not Addresses 47
Bit Memory 48
Data Blocks 49
Data in Logix 50
I/O and Alias Tags 51
Programming Languages 53
Logix Ladder Diagram 54
Logix Structured Text 54
Logix Function Block Diagram 55
Arrays not Pointers 56
Add-On Instructions 57
The Common Industrial 58
Protocol (CIP) 58
Viewing the Network 59
Data Exchange 60
User-Defined Data Types 61
Asynchronous I/O Updating 62
The DINT Data Type 62
Phase Manager 63
Coordinated System Time 65
Timestamped Inputs 65
Scheduled Outputs 65
No Temporary Variables 66
No Accumulators or 66
Special Registers needed 66
Logix System Functions 68
Date and Time Setting and 69
Read System Time 69
Handling of Interrupts 70
Status – Controller 71
Status – Module 71
Status – for OBs and Tasks 72
Conversion Routines 73
String Handling Routines 73
Examples of System 74
Function Calls 74
Disabling Interrupts 76
Get Faults 79
Module Information 80
Get Scan Time 81
Conversion Code Examples 83
Set and Reset 84
Test for Greater Than 85
On Timer Delay 86
Call to User Function 87
Boolean Network 88
The Logix LD Editor 89
Jumps and Decision Making 90
STEP 7 - Jump List 91
Logix - Ladder Logic 92
STEP 7 Array Creation 94
Logix Array Creation 94
Array Declaration Syntax 94
Array Access in STEP 7 95
User Data Types 99
Pointers and Arrays 102
State Machine 103
STEP 7 State Machine 104
String Definition in Logix 108
String Definition in STEP 7 108
STEP 7 Temporary Variables 110
Functions 110
Example - a Ramp Function 111
Block Copy, COP and CPS 114
Mathematical Expressions 116
STEP 7 - LAD 117
Logix - ST 118
Logix - LD 118
STEP 7 - User Function 118
Type Checking 119
Conclusion 119
Other Topics Related to 120
Programming 120
A Larger Example - Control 121
User Data Type Valve 122
The Add-On Instruction 123
Add-On Instruction Local Data 124
Add-On Instruction Logic 125
UDT Valve is also present) 126
Introduction 129
Not Selecting 129
Appropriate Hardware 129
Implementation of Incorrect 131
Data Types – DINT 131
User Code Emulating 132
Existing Instructions 132
S7 to Logix Glossary 135
Software Terminology 136
Appendix 139
Compact S7 300 CPUs 140
Standard S7 300 CPUs 140
Technology S7 300 CPUs 141
Fail-Safe S7 300 CPUs 142
S7 300 Digital Input 142
S7 300 Digital Output 143
S7 300 Analog Output 145
S7 300 Analog Combo 146
S7 400 Standard Controllers 146
Redundant and Fail Safe 147
Controllers 147
Digital Input Modules 147
Digital Output Modules 147
Analog Input Modules 148
Analog Output Modules 148
SIMATIC Micro Panels and 149
Rockwell Automation 149
Equivalents 149
SIMATIC Panels - 7x Series 151
SIMATIC Panels - 17x 152
Series and Rockwell 152
Automation Equivalents 152
SIMATIC Panels - 27x 155
SIMATIC Multi Panels - 27x 157
SIMATIC Multi Panels - 37x 159

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Siemens 7 Manuel d'utilisateur Page 103

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