Siemens SIMATIC PCS 7 CPU 410-5H System Manual page 7

15.5 Programming device functions in STEP 7 ............................................................................ 241
15.6 Communication services ....................................................................................................... 242
15.6.1 Overview of communication services ................................................................................... 242
15.6.2 PG communication ................................................................................................................ 243
15.6.3 OP communication ................................................................................................................ 244
15.6.4 S7 communication ................................................................................................................ 244
15.6.5 S7 routing .............................................................................................................................. 246
15.6.6 Data set routing ..................................................................................................................... 249
15.6.7 SNMP network protocol ........................................................................................................ 251
15.6.8 Open Communication Via Industrial Ethernet ...................................................................... 252
15.7 Basics and terminology of fault-tolerant communication ...................................................... 256
15.8 Usable networks ................................................................................................................... 260
15.9 Communication via S7 connections ...................................................................................... 260
15.9.1 Communication via S7 connections - one-sided mode ........................................................ 261
15.9.2 Communication via redundant S7 connections .................................................................... 264
15.9.3 Communication via point-to-point CP on the ET 200M ........................................................ 266
15.9.4 Custom connection to single-channel systems .................................................................... 268
15.10 Communication via fault-tolerant S7 connections ................................................................ 269
15.10.1 Communication between fault-tolerant systems ................................................................... 272
15.10.2 Communication between fault-tolerant systems and a fault-tolerant CPU ........................... 275
15.10.3 Communication between fault-tolerant systems and PCs .................................................... 276
15.11 Consistent data ..................................................................................................................... 279
15.11.1 Consistency of communication blocks and functions ........................................................... 279
15.11.2 Consistency rules for SFB 14 "GET" or read variable, and SFB 15 "PUT" or write
variable ................................................................................................................................. 280
15.11.3 Consistent reading and writing of data from and to DP standard slaves/IO devices ........... 280
15.12 Link-up and update sequence .............................................................................................. 283
15.12.1 Link-up sequence .................................................................................................................. 287
15.12.2 Update sequence .................................................................................................................. 288
15.12.3 Switch to CPU with modified configuration ........................................................................... 291
15.12.4 Disabling of link-up and update ............................................................................................ 292
15.13 The user program ................................................................................................................. 293
15.14 Other options for connecting redundant I/Os ........................................................................ 294
15.15 Cycle and response times of the CPU 410-5H ..................................................................... 298
15.15.1 Cycle time ............................................................................................................................. 298
15.15.2 Calculating the cycle time ..................................................................................................... 300
15.15.3 Cycle load due to communication ......................................................................................... 304
15.15.4 Response time ...................................................................................................................... 307
15.15.5 Calculating cycle and response times .................................................................................. 313
15.15.6 Examples of calculating the cycle and response times ........................................................ 314
15.15.7 Interrupt response time ......................................................................................................... 317
15.15.8 Example of calculation of the interrupt response time .......................................................... 319
15.15.9 Reproducibility of delay and watchdog interrupts ................................................................. 320
15.16 Runtimes of the FCs and FBs for redundant I/Os ................................................................ 321
CPU 410-5H Process Automation
System Manual, 09/2014, A5E31622160-AB
Table of contents
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