Cycle/Clock Memory - Siemens SIMATIC PCS 7 Configuration Manual

6.1.2

Cycle/Clock Memory

Settings on the "Cycle/Clock Memory" tab:
Note
The cycle monitoring time and the size of the process image inputs/outputs are set to the
maximum value and cannot be changed with CPU 410-5H. The following sections for the
410-5H CPU are therefore irrelevant.
Scan cycle monitoring time
The scan cycle monitoring time should not be changed from the default value of '6000 ms' for
PCS 7 projects to ensure the effectiveness of CPU performance monitoring and the emergency
stop (shutdown prevention).
Size of the process image of the inputs/outputs
The size of the process image of the inputs/outputs depends on the I/O address space needed
for the process signals. Adapt both values using the signal list from the plant planning where
the default size set is not adequate. Factor in appropriate reserves where a standard AS is
used and you wish to expand your plant while in operation. For H systems, the parameters
highlighted in blue can be changed during operation.
Compendium Part A - Configuration Guidelines (V8.2)
Configuration Manual, 08/2016, A5E38166869-AA
Configuration of the hardware (AS and I/O)
6.1 General CPU settings (H system and standard AS)
85