Table of contents
PROFINET with STEP 7 V15
10 Function Manual, 12/2017, A5E03444486-AH
5.5 Real-time communication .................................................................................................... 173
5.5.1 Introduction .......................................................................................................................... 173
5.5.2 RT ........................................................................................................................................ 174
5.5.3 IRT ....................................................................................................................................... 175
5.5.4 Comparison of RT and IRT .................................................................................................. 178
5.5.5 Configuring PROFINET IO with IRT .................................................................................... 178
5.5.6 Setting the bandwidth usage for the send clock .................................................................. 181
5.5.7 Setup recommendations for optimizing PROFINET ............................................................ 183
5.5.8 Limitation of the data infeed into the network ...................................................................... 187
5.6 PROFINET with performance upgrade ................................................................................ 189
5.6.1 Dynamic frame packing ....................................................................................................... 190
5.6.2 Fragmentation ...................................................................................................................... 191
5.6.3 Fast forwarding .................................................................................................................... 192
5.6.4 Configuration of IRT with high performance ........................................................................ 193
5.6.5 Sample configuration for IRT with high performance........................................................... 197
5.7 Isochronous mode ............................................................................................................... 198
5.7.1 What is isochronous mode? ................................................................................................. 198
5.7.2 Use of isochronous mode .................................................................................................... 199
5.7.3 Isochronous applications ..................................................................................................... 199
5.7.4 Time sequence of synchronization ...................................................................................... 200
5.7.5 Basics of Programming ........................................................................................................ 201
5.7.6 Program processing according to the IPO model with application cycle = 1 ....................... 202
5.7.7 Program execution according to the IPO model with application cycle > 1 ......................... 204
5.7.8 Configuring isochronous mode ............................................................................................
205
5.
7.9 Setting the application cycle and delay time ........................................................................ 208
5.8 Device replacement without exchangeable medium ........................................................... 210
5.8.1 Device replacement without exchangeable medium/PG function ....................................... 211
5.8.2 Replacing an IO device without exchangeable medium ...................................................... 212
5.8.3 Permit overwriting of PROFINET device name ................................................................... 213
5.9 Standard machine projects .................................................................................................. 217
5.9.1 Multiple use IO systems ....................................................................................................... 218
5.9.1.1 What you should know about multiple use IO systems ....................................................... 218
5.9.1.2 Configuring multiple use IO systems ................................................................................... 221
5.9.1.3 Adapt multiple use IO systems locally ................................................................................. 224
5.9.2 Configuration control for IO systems ................................................................................... 226
5.9.2.1 Information about configuration control of IO systems ........................................................ 226
5.9.2.2 Configuring IO devices as optional ...................................................................................... 229
5.9.2.3 Enabling optional IO devices in the program ....................................................................... 230
5.9.2.4 Configuring flexible order of IO devices ............................................................................... 236
5.9.2.5 Customizing arrangement of IO devices in the program ..................................................... 238
5.9.2.6 System behavior and rules .................................................................................................. 241
5.10 Saving energy with PROFIenergy........................................................................................ 243
5.11 Docking systems .................................................................................................................. 246
5.11.1 Configuring docking systems ............................................................................................... 248
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