Siemens SIMATIC PCS 7 Operating Manual page 135

A performance analysis of the AS load is also possible. The performance analysis depends
on the CPU firmware (CPU FW V4.5 and above). If the CPU FW supports SFC78, the
performance data can be read via "CPU_RT". The performance data is shown in the
diagnostic area of PCS 7 Asset Management.
Note
You can find additional information on "CPU_RT" in the section "Family: @System" of the
"SIMATIC Process Control System PCS 7 Basic Library"
(https://support.industry.siemens.com/cs/ww/en/view/109738089) manual.
Compendium Part B - Process Safety (V8.2)
Operating Manual, 07/2016, A5E35031794-AB
Configuring the safety program
7.11 Monitoring times and system response times
135