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Getting Started
2–2
Getting Started
The DirectNET Basics
DirectNET is an easy-to-use data network for the DirectLOGIC family of
products. DirectNET is the perfect choice for those applications requiring data to be
shared between programmable controllers (PLCs) or, between PLCs and a host
computer. This network operates at speeds up to 38.4Kbps and permits you to
upload or download virtually any type of system data. Some examples are:
S Timer / Counter Data
S I/O Information
S Variable Memory Information (V memory, registers, etc.)
DirectNET is a great choice for sharing small amounts of data between network
devices and has many advantages. You can build a data network with a minimal
investment in equipment and training because:
S The DL430, DL440, DL340, and DL240 Central Processing Units
(CPUs) have built-in DirectNET ports.
S In the most common applications there is no need for complex
communications programming. Simple Relay Ladder Logic instructions
can be used to manage the communications, so you don’t have to be a
networking guru to start moving data around.
DirectNET operates asynchronously at speeds up to 38.4K baud. Therefore, it is not
the best choice in an application requiring extremely fast update times and moving
large amounts of data.
It’s an Easy-to-use
Data NETwork
It has
Advantages...
It has
Disadvantages...
- DirectNETt 1
- Trademarks 2
- Manual Revisions 3
- Table of Contents 4
- How to Use 13
- Introduction 14
- Getting Started with 16
- DirectNET 16
- Communications 16
- The DirectNET Basics 17
- Operator Interface 20
- Choosing a Configuration 23
- Combination 24
- 1 – PLC as Master Network 24
- 2 – Host as Master Network 24
- 3 – Peer as Master Network 24
- How can I create a network? 27
- Network Design 28
- Choosing the Configuration 29
- Possible Configurations 31
- Step 3: Secure the shield to 37
- DL430 and DL440 Port Pinouts 39
- DL405 DCM Port Pinouts 40
- DL340 CPU Port Pinouts 41
- DL305 DCU Port Pinouts 42
- DL240 CPU Port Pinouts 43
- Point-to-point Cables 44
- Master Slave 47
- Multi-Drop Cables 49
- Network Design Checklist 57
- Communication 58
- Settings 58
- 10 11 12 13 14 15 62
- D3–340 CPU 67
- Port On Delay Off Delay 68
- Port 1 R776 R777 68
- Port 2 R774 R775 68
- Programs 72
- Y20 – Y37 73
- Y0 – Y17 73
- * See Note on DCM Address 75
- Specifying the Amount of Data 76
- 01234567 79
- DirectNET Host 82
- Modes of Operation 85
- Protocol Components 87
- Initiating the Request 91
- Acknowledging the Request 92
- Defining the Request 93
- Transferring Data 95
- ETB or ETX 96
- Data Block 96
- Calculating the Data LRC 98
- Ending the Request 99
- Timing Considerations 100
- Network Operation 103
- Starting the Network 104
- Troubleshooting 105
- & Troubleshooting 107
- Master / Slave 110
- The Example 111
- Remember these Four Steps! 113
- Step 1: Design the Network 114
- *Delay time in milliseconds 116
- Step 4: Start the Network 124
- V MON 0000 XXXX 126
- Peer Master Example 128
- Host Master Example 144
- Appendix C 154
- Host Master 154
- Data Types and 159
- Memory Maps 159
- DL405 Data Types 160
- DL430 Memory Map 165
- DL440 Memory Map 166
- X Input Bit Map 167
- Y Output Bit Map 168
- Remote I/O Bit Map 169
- Control Relay Bit Map 171
- Appendix D 174
- DL405 Memory Map 174
- Timer Status Bit Map 175
- Counter Status Bit Map 176
- Memory Map 177
- DL305 Data Types 178
- DL330 Memory Map 181
- DL330P Memory Map 182
- DL340 Memory Map 183
- I/O Point Bit Map 184
- Special Relays 187
- 0 10010011 0100010 188
- R565 R564 188
- Data Registers 189
- Shift Register Bit Map 192
- Special Registers 193
- DL305 / 405 Cross Reference 194
- DL205 Data Types 197
- DL230 Memory Map 202
- DL240 Memory Map 203
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