Siemens CPU 410-5H Process Automation System Manual page 7

16.6.4 S7 communication ..................................................................................................................... 224
16.6.5 S7 routing ................................................................................................................................... 226
16.6.6 Data set routing .......................................................................................................................... 230
16.6.7 SNMP network protocol ............................................................................................................. 231
16.6.8 Open Communication Via Industrial Ethernet ............................................................................ 232
16.7 Basics and terminology of fault-tolerant communication ........................................................... 235
16.8 Usable networks......................................................................................................................... 239
16.9 Communication via S7 connections ........................................................................................... 239
16.9.1 Communication via S7 connections - one-sided mode.............................................................. 240
16.9.2 Communication via redundant S7 connections ......................................................................... 242
16.9.3 Communication via point-to-point CP on the ET 200M ............................................................. 243
16.9.4 Custom connection to single-channel systems .......................................................................... 245
16.10 Communication via fault-tolerant S7 connections ...................................................................... 246
16.10.1 Communication between fault-tolerant systems ........................................................................ 248
16.10.2 Communication between fault-tolerant systems and a fault-tolerant CPU ................................ 251
16.10.3 Communication between fault-tolerant systems and PCs ......................................................... 252
16.11 Consistent data .......................................................................................................................... 254
16.11.1 Consistency of communication blocks and functions ................................................................ 254
16.11.2 Consistency rules for SFB 14 "GET" or read variable, and SFB 15 "PUT" or write variable ..... 255
16.11.3 Consistent reading and writing of data from and to DP standard slaves/IO devices ................. 256
16.12 Link-up and update sequence .................................................................................................... 257
16.12.1 Link-up sequence ....................................................................................................................... 261
16.12.2 Update sequence ....................................................................................................................... 262
16.12.3 Switch to CPU with modified configuration or expanded memory configuration ....................... 265
16.12.4 Disabling of link-up and update .................................................................................................. 266
16.13 The user program....................................................................................................................... 267
16.14 Other options for connecting redundant I/Os ............................................................................. 268
16.15 Cycle and response times of the CPU 410-5H .......................................................................... 272
16.15.1 Cycle time .................................................................................................................................. 272
16.15.2 Calculating the cycle time .......................................................................................................... 274
16.15.3 Communication load .................................................................................................................. 277
16.15.4 Response time ........................................................................................................................... 279
16.15.5 Calculating cycle and response times ....................................................................................... 285
16.15.6 Examples of calculating the cycle and response times ............................................................. 286
16.15.7 Interrupt response time .............................................................................................................. 288
16.15.8 Example of calculation of the interrupt response time ............................................................... 290
16.15.9 Reproducibility of delay and watchdog interrupts ...................................................................... 291
16.16 Runtimes of the FCs and FBs for redundant I/Os ...................................................................... 292
A Characteristic values of redundant automation systems ...................................................................... 295
A.1 Basic concepts ........................................................................................................................... 295
A.2 Comparison of MTBF for selected configurations ...................................................................... 299
A.2.1 System configurations with redundant CPU 410-5H ................................................................. 299
A.2.2 System configurations with distributed I/Os ............................................................................... 300
A.2.3 Comparison of system configurations with standard and fault-tolerant communication ............ 304
B Function and communication modules that can be used in a redundant configuration .......................... 305
CPU 410-5H Process Automation/CPU 410 SMART
System Manual, 10/2013, A5E32631667-AA
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