Rockwell Automation 1785 PLC-5 Manuel d'utilisateur Page 74
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Planning Your System Programs
Chapter 6
6-3
Application Example for SFCs
For typical SFC applications, an SFC program controls the order of events
in your process by issuing commands. A command, such as
fwdcyr_cmd
to move a conveyor forward, is simply a data table storage bit (for example
B3:0/7) that you set up in the SFC. You then program the logic for
fwdcyr_cmd in a separate ladder program to control the actual outputs to
move the conveyor.
You can have only one main program file, which is either an SFC or a
ladder-logic program. You enter the programs into your computer using the
SFC or ladder editor. For more information on entering SFCs or ladder
logic, see your programming software documentation set.
Programming Considerations for SFCs
Use the information in Table 6.B for SFC rules for special programming.
Table 6.B
SFC
Rules for Special Programming Considerations
If you have: Use these rules:
To jump within the SFC Use a GOTO statement and label.
A step that needs to be run in
multiple places within the SFC
Repeat the step where needed or use a global subroutine that gets called
from multiple steps.
A step that can be ignored based on
logic conditions
Create two selection branches, one with and one without the step; or
place the step in a subroutine; or combine the step with another step that
is segregated by an MCR zone.
An SFC branch structure within
another branch structure (nesting)
Nest the branch structures. The software supports as many levels of
nested branches as you can store based on processor memory.
A miniSFC (compressed steps)
within the main SFC
Create an SFC macro. A macro begins a with a step; the transition for the
ending step follows the macro.
To reset the logic in an SFC program Set the SFR instruction to reset the chart.
To disable an MCP Set the disable bit on the Processor Configuration screen.
See your programming software documentation for further information on any of the techniques listed in this table.
This section uses a drill-machine application example. Information on the
program entry phase is in the programming software documentation set.
You can use only one main program; but you can still apply some of
the steps by incorporating them into your main SFC and supporting
ladder programs.
Preparing the Programs
for Your Application
- Classic 1785 PLC5 1
- Programmable 1
- Controllers 1
- AllenBradley 1
- Important User Information 2
- Summary of Changes 3
- Table of Contents 4
- Table of Contentsii 5
- Table of Contents iii 6
- Table of Contentsiv 7
- of this Manual 8
- Manual Organization 9
- How to Use this Manual 9
- Understanding Your System 11
- Designing 12
- Systems 12
- Preparing 13
- Functional Specification 13
- Figure 1.2 14
- ProgramDevelopment 14
- Introducing 15
- Classic PLC5 15
- Processor Modules 15
- Using the Classic PLC5 18
- Processor as a Remote I/O 18
- Choosing Hardware 20
- Selecting I/O Module Density 21
- Master/Expander I/O Modules 22
- Selecting I/O Adapter 23
- Other Devices on an I/O Link 24
- Selecting 25
- I/O Chassis 25
- Selecting an Operator 25
- Interface 25
- Other Operator Interfaces 27
- Choosing 28
- a Classic PLC5 28
- Processor for Your 28
- Application 28
- Selecting Power Supplies 28
- Chapter 2 29
- Powering 30
- Table 2.K 30
- 1770XY is a 3.6 V 32
- a PLC5 Processor 33
- Backup System 33
- Selecting Link Terminators 34
- Connecting a 34
- Programming Terminal to a 34
- Processor Module 34
- Choosing Cables 34
- Programming Terminal 35
- Placing System Hardware 36
- Chapter 3 37
- Planning Cabling 40
- Laying Out the 41
- Backpanel Spacing 41
- Grounding Configuration 42
- Assigning Addressing Modes 43
- Racks, and Groups 43
- Understanding the Terms 44
- Used in this Chapter 44
- Choosing the 45
- Addressing Mode 45
- Using 1Slot Addressing 48
- Chapter 4 49
- Using 1/2Slot Addressing 50
- Assigning 51
- Remote I/O Racks 52
- Addressing 54
- Choosing Communication 59
- Chapter 5 60
- Figure 5.1 60
- Front Panels 60
- Configuring Communication 61
- Configuring a DH+ Link 61
- Figure 5.2 62
- Passing 62
- Test Setup 65
- Application Guidelines 66
- Connecting a DH+ Link 68
- Choosing Programming 68
- Terminal Connection 68
- Remote Connection 69
- Serial Connections 70
- 1770KF2/B 71
- Planning Your System Programs 72
- Deciding How to Use an SFC 73
- Preparing the Programs 74
- Organizing a Machine Example 75
- Addressing Data T 78
- is the default file number 79
- the Processor 80
- Status File 80
- Chapter 6 81
- Table 6.F 81
- Status File Addresses 81
- Selecting Interrupt Routines 83
- Program Execution States 84
- Writing a Fault Routine 85
- Major Fault Codes 86
- Chapter 7 87
- Table 7.H 87
- Fault Codes 87
- Programming a Fault Routine 88
- Figure 7.4 89
- Testing a Fault Routine 90
- Setting Up a Fault Routine 90
- Enabling a Fault Routine 90
- Figure 7.5 91
- Setting PowerUp Protection 92
- Understanding 93
- ProcessorDetected 93
- Major Faults 93
- Fault in a Remote I/O Chassis 94
- Rack Fault 94
- Objectives 96
- Transferring Data Using 96
- Adapter Mode 96
- Discrete 99
- Chapter 8 101
- Table 8.K 101
- Programming Block 102
- Transfer in Adapter Mode 102
- Addressing Tips 103
- Figure 8.6 106
- Figure 8.7 107
- Figure 8.8 108
- Figure 8.9 109
- Transferring Data 111
- Using Scanner Mode 111
- Programming Discrete 111
- Transfer in Scanner Mode 111
- BlockTransfer Sequence 114
- Programming 116
- Considerations 116
- Calculating Program Timing 118
- Chapter 9 119
- I/O Scanning 120
- I/O ScanningDiscrete 122
- Figure 9.2 123
- Transferring 123
- Instruction Timing and 124
- Memory Requirements 124
- Processors 125
- File Instructions 128
- Program Constants 130
- Direct and Indirect Elements 130
- Maximizing System Performance 133
- Backplane T 134
- Remote I/O Scan T 134
- Number of Rack Entries 135
- Block Transfers 135
- Calculating 136
- Processor 138
- Calculating Throughput 138
- Selecting Switch Settings 139
- Chassis Backplane with 140
- Adapter Module 140
- Chassis Configuration Plug 141
- Remote I/O Adapter Module 142
- 1771ASB Series C without 142
- Complementary I/O 142
- Appendix A 143
- 1771ASB Series C with 144
- AdapterMode 146
- ProcessorsSW2 146
- PLC5 or Scanner Module 146
- PLC2/20, 2/30, or Sub I/O 147
- Scanner Module System 147
- PLC3 or PLC5/250 System 148
- Design Worksheets 151
- Appendix B 152
- Determine Control Strategy 154
- Identify Chassis Locations 156
- Total I/O Module Requirements 159
- Assign Addresses 160
- Select Adapter Modules 162
- Place System Hardware 164
- Configure Switch Settings 165
- Select Power Supplies 173
- Choose a Programming Terminal 174
- Select Operator Interface 176
- With major offices worldwide 186
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