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Transferring Data Using Communication Blocks
138
33002479 06 07/2008
READ_REG
Function
Description
Upon request, the READ_REG block reads a register area once (rising edge of the
REQ input). It reads data from an addressed slave via TCP/IP Ethernet.
EN and ENO can be projected as additional parameters.
Symbol Block representation:
Parameter
Description
Description of block parameters:
Note: About this function block:
z When programming this function, you must be familiar with the routing
procedures used by your network.
z For technical reasons, this function block does not allow the use of ST and IL
programming languages.
READ_REG
REQBOOL
SLAVEREG
DINT
NO_REG
INT
AddrFld
WordArr5
BOOLNDR
BOOL
ERROR
WORD
REG_READ
WORD
STATUS
Parameter Data Type Meaning
REQ BOOL start read operation once
SLAVEREG DINT offset address of the first %MW word (4x register) in the slave
to be read from
NO_REG INT number of registers to be read from slave
AddrFld WordArr5 data structure describing the TCP/IP address
NDR BOOL set to 1 for one cycle after reading new data
ERROR BOOL set to 1 for one scan in case of error
STATUS WORD error code
REG_READ WORD first %MW word (4x register) for read values
- Modicon Quantum with 1
- Document Set 3
- Table of Contents 5
- 6 33002479 06 07/2008 6
- 33002479 06 07/2008 7 7
- 8 33002479 06 07/2008 8
- 33002479 06 07/2008 9 9
- 10 33002479 06 07/2008 10
- Safety Information 11
- About the Book 13
- 33002479 06 07/2008 15 15
- Modicon Quantum with Unity 17
- Ethernet Products 17
- Product Description 19
- Introduction 21
- CPU 65* *0 23
- CPU 651 60S 23
- 1 Hang the module 24
- Controls and Displays 25
- 33002479 06 07/2008 27 27
- Indicators 29
- End CPU modules 30
- Using the LCD Display Screens 31
- 33002479 06 07/2008 33 33
- PLC Operations 35
- 33002479 06 07/2008 37 37
- ##.##.##.##.##.## 38
- 33002479 06 07/2008 39 39
- 33002479 06 07/2008 41 41
- Do Not Duplicate Address 45
- Use Permanent Felt-tip Pen 45
- Key Ethernet 46
- 33002479 06 07/2008 47 47
- 33002479 06 07/2008 49 49
- NWM 100 module 50
- Connectors and Cabling 51
- 33002479 06 07/2008 53 53
- 1.3 Installing the Module 54
- Before You Begin 55
- Cable Schemes 57
- Security 59
- 33002479 06 07/2008 61 61
- Connecting the Cable 62
- Establishing the FTP Password 68
- 33002479 06 07/2008 69 69
- Ethernet Configuration 70
- 33002479 06 07/2008 71 71
- HTTP User Name and Password 72
- Data Monitor Write Password 72
- 1.4 Customer Support 75
- Support 76
- Documentation 76
- MS-Windows documentation 76
- Contact Information 77
- 33002479 06 07/2008 81 81
- 33002479 06 07/2008 83 83
- Modbus Messaging 85
- Modbus/TCP server 86
- Global Data 89
- Time Synchronization Service 90
- Bandwidth Monitoring 92
- 33002479 06 07/2008 93 93
- FTP Server 94
- 33002479 06 07/2008 95 95
- Additional Ethernet Services 97
- Ethernet Modules Services 99
- Ethernet Services 100
- At a Glance 101
- 33002479 06 07/2008 102
- Overview 103
- Configure Network 105
- Properties of a network 106
- 33002479 06 07/2008 107 107
- GROUP NAME 109
- NET LINK 109
- 33002479 06 07/2008 113 113
- Address Server 114
- IP Configuration 115
- Parameter description: 116
- 33002479 06 07/2008 119 119
- Client / Server procedure 121
- Parameter description 121
- Unity Ethernet Services 123
- Using Ethernet Services 124
- Transferring Data Using 125
- Communication Blocks 125
- 4.1 Communications Issues 127
- Recommended 128
- CREAD_REG 130
- Elementary 131
- Description for 131
- WordArr5 with 131
- TCP/IP Ethernet 131
- 33002479 06 07/2008 133 133
- CWRITE_REG 134
- 33002479 06 07/2008 137 137
- READ_REG 138
- 33002479 06 07/2008 139 139
- WRITE_REG 141
- 33002479 06 07/2008 143 143
- TCP_IP_ADDR 144
- 33002479 06 07/2008 145 145
- 4.3 MBP_MSTR 146
- Block Description 147
- Input Parameters 149
- Parameters 149
- Operational Function Codes 151
- Control Block for 153
- SY/MAX Ethernet 154
- 33002479 06 07/2008 155 155
- Modbus Plus and 156
- Network Errors 156
- 33002479 06 07/2008 159 159
- SY/MAX-Specific Error Codes 161
- Read Data 163
- Write Data 165
- Get Local Statistics 167
- Clear Local Statistics 168
- Write Global Data 169
- Read Global Data 170
- Get Remote Statistics 171
- Control Block 172
- Usage for TCP/IP 172
- Ethernet 172
- Clear Remote Statistics 173
- Network 174
- Statistics 174
- 33002479 06 07/2008 175 175
- Peer Cop Health 177
- Reset Optional Module 178
- Read CTE 179
- Write CTE 181
- Send Email 183
- DATABUF 184
- Parameter 184
- Description 184
- Read/Write Data 185
- 33002479 06 07/2008 189 189
- 33002479 06 07/2008 191 191
- Multicast Filtering 192
- 33002479 06 07/2008 195 195
- 33002479 06 07/2008 197 197
- I/O Scanner 199
- I/O Scanner Concepts 200
- 33002479 06 07/2008 201 201
- Device Control 202
- 33002479 06 07/2008 203 203
- 33002479 06 07/2008 207 207
- Configuration 209
- Response Time 210
- 33002479 06 07/2008 211 211
- Address Server Configuration/ 213
- Faulty Device Replacement 213
- 33002479 06 07/2008 215 215
- 33002479 06 07/2008 217 217
- 33002479 06 07/2008 219 219
- 33002479 06 07/2008 221 221
- Network Management Service 223
- 33002479 06 07/2008 225 225
- ASN.1 Naming Scheme 227
- Configuring an NOE with SNMP 229
- 33002479 06 07/2008 231 231
- 33002479 06 07/2008 233 233
- 33002479 06 07/2008 235 235
- 33002479 06 07/2008 237 237
- Equipment 238
- Profile Subtree 238
- 33002479 06 07/2008 239 239
- 33002479 06 07/2008 241 241
- NTP Time Synchronization 243
- Using the NTPTime Service 244
- CPS CPU NOE77111 245
- NTP Time 246
- Synchronization 246
- Definitions 246
- Representation 247
- Description of parameters: 248
- Model Starting Date 249
- Configuring the 250
- 33002479 06 07/2008 251 251
- Customizing 252
- Time Zone 252
- Electronic Mail Notification 255
- CPS CPU NOE 257
- Mail Service 258
- 33002479 06 07/2008 261 261
- Mail Service Error Codes 262
- 33002479 06 07/2008 263 263
- Using the Mail Service 264
- Embedded Web Pages 265
- What's in this 266
- Chapter? 266
- Quantum Home Page 267
- Telemecanique 268
- Accessing the 274
- Module’s Home 274
- Do the following 274
- Configured Local 276
- Rack Page 276
- CPU Configuration Page 277
- Remote I/O Status 279
- Quantum PLC Data Monitor Page 280
- SNMP Configuration 281
- 33002479 06 07/2008 283 283
- 33002479 06 07/2008 285 285
- Address Server Configuration 289
- Mail Service Configuration 295
- ETHERNET MODULE STATISTICS 300
- 33002479 06 07/2008 301 301
- EMAIL DIAGNOSTIC 302
- 33002479 06 07/2008 303 303
- NTP Diagnostics Page 304
- 33002479 06 07/2008 305 305
- NOE Properties Page 306
- Hot Standby 309
- 33002479 06 07/2008 311 311
- Hot Standby Topology 312
- IP Address Assignment 314
- 33002479 06 07/2008 317 317
- Power Up and 318
- Services 318
- 33002479 06 07/2008 319 319
- Address Swap Times 320
- Appendices 325
- Maintenance 327
- NOE 771 xx 328
- 33002479 06 07/2008 329 329
- 33002479 06 07/2008 333 333
- Downloading a New NOE Exec 334
- 33002479 06 07/2008 335 335
- Downloading a New NOE Kernel 337
- Specifications 339
- 140 NWM 100 00 341
- Specification 341
- Application Protocol 343
- 33002479 06 07/2008 345 345
- 33002479 06 07/2008 347 347
- 33002479 06 07/2008 349 349
- TCP/IP Specific Issues 351
- Reference Documents 352
- Modicon Quantum Platform 353
- Installation 355
- 33002479 06 07/2008 357 357
- NOE 771 01 module in slot 4 358
- Setting Up the 359
- 33002479 06 07/2008 361 361
- I/O Scanning 364
- 33002479 06 07/2008 365 365
- Connecting the 367
- PC to the PLC 367
- 33002479 06 07/2008 369 369
- 33002479 06 07/2008 371 371
- Glossary 373
- 33002479 06 07/2008 381 381
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