# Program blocks / 10 System operations

Overview

### Program blocks

- 10 System operations
  - LGF_IsBigEndian (FC / 1.0.0)
  - LGF_IsLittleEndian (FC / 1.0.0)
  - LGF_ActDeactDevice (FB / 2.0.0)
  - LGF_ActDeactMonitorDevice (FB / 2.0.0)
  - LGF_MeasureCpuLoad (FB / 1.1.1)
  - LGF_ReadPnInterfaceParameter (FB / 1.0.0)

### PLC data types

- 10 System operations
  - LGF_typeActDeactDeviceParameter (UDT / V2.0.0)
  - LGF_typeActDeactMonitorDeviceParameter (UDT / V2.0.0)
  - LGF_typeMeasureCpuLoad_Configuration (UDT / V1.0.0)
  - LGF_typeMeasureCpuLoad_ConfigurationBlock (UDT / V1.0.0)
  - LGF_typeMeasureCpuLoad_ResultBlock (UDT / V1.0.0)
  - LGF_typeSystemClockGen (UDT / V1.0.0)