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94 Publication LOGIX-AP008B-EN-P - June 2008
Chapter 4 Conversion of Typical Program Structures
Arrays
STEP 7 and Logix both allow arrays of simple or complex objects to be
created in memory. Logix has high-level support for accessing arrays. In STEP
7 however, low-level programming is needed.
STEP 7 Array Creation
The following screen shot shows two arrays that have been created in an
instance data block. Simple_array is an array of 10 elements. UDT_array is an
array of 10 structures of type test_UDT1, where test_UDT1 is a user data type
containing a few other types, not shown.
Logix Array Creation
This is exactly the same in Logix.
Array Declaration Syntax
STEP 7 uses the declaration syntax ARRAY[0…15] OF REAL. Logix uses
REAL[15].
STEP 7 has a special syntax for strings. STRING[32] is a 32 character string in
STEP 7 whereas in Logix STRING[32] is an array of thirty two strings, each
one containing 82 characters.
- 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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