dl-breadcrumbs__homedl-breadcrumb-item__separatorConfiguration and programmingdl-breadcrumb-item__separatorSystem technologydl-breadcrumb-item__separatorSystem technology of CPU and overall systemdl-breadcrumb-item__separator...dl-breadcrumb-item__separatorSystem processingdl-breadcrumb-item__separatorSystem start-up / Program processingdl-breadcrumb-item__separatorPLC utilizationdl-breadcrumb-item__separatorGeneral
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PLC_Utilization

The parameters ‎cpuload‎ and ‎plcload‎ represent the actual CPU load or PLC load of the system.

  • ‎cpuload‎: This value represents the time the PLC requires to calculate all processes running on the PLC. For a good system performance this value should be less than 80%. In case of a higher value, the degree of utilization should be reduced by using a more powerful PLC or by reducing the amount of processes.

  • ‎plcload‎: This value represents the time the PLC requires to calculate all real-time processes. Real-time processes are either high priority system tasks or IEC tasks with a priority between 0 and 15. For a good system performance this value should be less than 60%. In case of a higher value, the degree of utilization should be reduced by using a more powerful PLC.

During commissioning we recommend to monitor the CPU and PLC values online with one of the following methods:

Automation Builder

  • Commissioning via 'PLC shell commands'⮫ “PLC shell commands” (command 'plcload' and 'cpuload').

  • Commissioning via 'Application at runtime'. In order to display the load of the CPU or PLC, create a new Device Trace object in your PLC project. Then upload the data into the views 'Command 'Upload Trace'.

IEC applications/IEC program

To access the parameters ‎plcload‎ and ‎cpuload‎ please use system functions as follows:

  • ‎plcload‎: SchedGetProcessorLoad() included in library ‘CmpSchedule’.

  • ‎cpuload‎: SysMCGetLoad() included in library ‘SysCpuMultiCore’.