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Transferring Discrete and BlockTransfer Data
Chapter 8
8-16
A PLC-5 processor, in scanner mode, transfers discrete-transfer and
block-transfer data with processor-resident local and remote I/O chassis. If
you have your processor configured for scanner mode, refer to the
following sections for more information on how a PLC-5 processor
transfers data in scanner mode. Also, the following sections provide
information on how to handle I/O rack faults for processor-resident local
and remote I/O (in scanner mode).
The processor scans processor-resident local I/O synchronously and
sequentially to the program scan.
The processor:
scans discrete-transfer data in the processor-resident local I/O chassis
synchronously and sequentially to the program scan.
scans discrete-transfer data in remote I/O chassis asynchronously to the
program scan. The remote I/O scan discrete-transfers I/O data between
remote I/O adapters in I/O chassis and the remote I/O buffer in the
processor.
performs housekeeping once per program scan: 3 ms maximum;
typically 1.5 ms
Transferring Data
Using Scanner Mode
Programming Discrete
Transfer in Scanner Mode
Read Inputs
Write Inputs
Processor
Rack
I/O Image
Table
Resident
Data
Exchange
Housekeeping
Logic
Scan
Program Scan
- 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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