Link-up and update
12.3 Link-up and update sequence
S7-400H
System Manual, 03/2012, A5E00267695-11
147
12.3.1
Link-up sequence
For the link-up sequence, you need to decide whether to carry out a master/reserve
changeover, or whether redundant system mode is to be achieved after that.
Link-up with the objective of setting up system redundancy
To exclude differences in the two subsystems, the master and the reserve CPU run the
following comparisons.
The following are compared:
1.
Consistency of the memory configuration
2.
Consistency of the operating system version
3.
Consistency of the load memory (FLASH card) content
4.
Consistency of load memory (integrated RAM and RAM card) content
If 1., 2., or 3. are inconsistent, the reserve CPU changes to STOP mode and outputs an error
message.
If 4. is inconsistent, the master CPU copies the user program from its load memory in RAM
to the reserve CPU.
The user program stored in load memory on the FLASH card is not transferred.
It must be identical before initiating link-up.
Link-up with master/reserve changeover
In STEP 7 you can select one of the following options:
●
"Switch to CPU with modified configuration"
●
"Switchover to CPU with expanded memory configuration"
●
"Switchover to CPU with modified operating system"
●
"Switchover to CPU with modified hardware version"
●
"Switchover to CPU via only one intact redundant link"
Switch to CPU with modified configuration
You may have modified the following elements on the reserve CPU:
●
The hardware configuration
●
The type of load memory (for example, you have replaced a RAM card with a FLASH
card). The new load memory may be larger or smaller than the old one.
The master does not transfer any blocks to the reserve during the link-up. For detailed
information, refer to section Switch to CPU with modified configuration or expanded memory
Содержание SIMATIC S7-400H
Страница 24: ...Preface 1 1 Preface S7 400H 24 System Manual 03 2012 A5E00267695 11 ...
Страница 46: ...Getting Started 4 5 Special layout features of SIMATIC Manager S7 400H 46 System Manual 03 2012 A5E00267695 11 ...
Страница 120: ...Memory concept 10 1 Overview of the memory concept of S7 400H CPUs S7 400H 120 System Manual 03 2012 A5E00267695 11 ...
Страница 258: ...Communication 14 8 General issues regarding communication S7 400H 258 System Manual 03 2012 A5E00267695 11 ...
Страница 354: ...Synchronization modules 18 3 Selecting fiber optic cables S7 400H 354 System Manual 03 2012 A5E00267695 11 ...
Страница 434: ...Technical data 20 6 Runtimes of the FCs and FBs for redundant I Os S7 400H 434 System Manual 03 2012 A5E00267695 11 ...
Страница 460: ...Function modules and communication processors supported by the S7 400H S7 400H 460 System Manual 03 2012 A5E00267695 11 ...