
Table of contents
CPU 410-5H Process Automation/CPU 410 SMART
System Manual, 09/2014, A5E32631667-AB 7
16.6.4 S7 communication ................................................................................................................241
16.6.5 S7 routing..............................................................................................................................242
16.6.6 Data set routing.....................................................................................................................246
16.6.7 SNMP network protocol ........................................................................................................247
16.6.8 Open Communication Via Industrial Ethernet ......................................................................248
16.7 Basics and terminology of fault-tolerant communication ......................................................251
16.8 Usable networks ...................................................................................................................255
16.9 Communication via S7 connections......................................................................................256
16.9.1 Communication via S7 connections - one-sided mode ........................................................257
16.9.2 Communication via redundant S7 connections ....................................................................259
16.9.3 Communication via point-to-point CP on the ET 200M ........................................................260
16.9.4 Custom connection to single-channel systems ....................................................................262
16.10 Communication via fault-tolerant S7 connections ................................................................263
16.10.1 Communication between fault-tolerant systems...................................................................265
16.10.2 Communication between fault-tolerant systems and a fault-tolerant CPU ...........................268
16.10.3 Communication between fault-tolerant systems and PCs....................................................269
16.11 Consistent data .....................................................................................................................271
16.11.1 Consistency of communication blocks and functions ...........................................................271
16.11.2 Consistency rules for SFB 14 "GET" or read variable, and SFB 15 "PUT" or write
variable .................................................................................................................................271
16.11.3 Consistent reading and writing of data from and to DP standard slaves/IO devices ...........272
16.12 Link-up and update sequence ..............................................................................................274
16.12.1 Link-up sequence..................................................................................................................277
16.12.2 Update sequence..................................................................................................................278
16.12.3 Switch to CPU with modified configuration...........................................................................281
16.12.4 Disabling of link-up and update ............................................................................................282
16.13 The user program .................................................................................................................283
16.14 Other options for connecting redundant I/Os........................................................................284
16.15 Cycle and response times of the CPU 410-5H.....................................................................287
16.15.1 Cycle time .............................................................................................................................287
16.15.2 Calculating the cycle time .....................................................................................................289
16.15.3 Cycle load due to communication.........................................................................................293
16.15.4 Response time ......................................................................................................................295
16.15.5 Calculating cycle and response times ..................................................................................300
16.15.6 Examples of calculating the cycle and response times ........................................................301
16.15.7 Interrupt response time.........................................................................................................304
16.15.8 Example of calculation of the interrupt response time..........................................................306
16.15.9 Reproducibility of delay and watchdog interrupts .................................................................307
16.16 Runtimes of the FCs and FBs for redundant I/Os ................................................................308
A Characteristic values of redundant automation systems ...................................................................... 311
A.1 Basic concepts......................................................................................................................311
A.2 Comparison of MTBF for selected configurations ................................................................315
A.2.1 System configurations with redundant CPU 410-5H ............................................................315
A.2.2 System configurations with distributed I/Os..........................................................................316
A.2.3 Comparison of system configurations with standard and fault-tolerant communication ......320