Link-up and update
12.4 Time monitoring
S7-400H
System Manual, 03/2012, A5E00267695-11
157
Response to time-outs
If one of the times monitored exceeds the configured maximum value, the following
procedure is started:
1.
Cancel update
2.
Fault-tolerant system remains in standalone mode, with the previous master CPU in RUN
3.
Cause of cancelation is entered in diagnostic buffer
4.
Call OB 72 (with corresponding start information)
The standby CPU then reevaluates its system data blocks.
Then, but after at least one minute, the CPU tries again to perform the link-up and update. If
still unsuccessful after a total of 10 retries, the CPU abandons the attempt. You yourself will
then need to start the link-up and update again.
A monitoring timeout can be caused by:
●
High interrupt load (e.g. from I/O modules)
●
High communication load causing prolonged execution times for active functions
●
In the final update phase, the system needs to copy large amounts of data to the
standby CPU.
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 ...