Table of contents
CPU 410-5H Process Automation
System Manual, 09/2014, A5E31622160-AB
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