Process data

Process data (PD) are all time-critical (realtime) data of a process that have to be processed or transmitted quickly. They are characterized by high dynamic properties and actuality.

Process data are, for example, setpoints and actual values of the frequency inverter, but also peripheral states of limit switches. Process data are exchanged cyclically between programmable controller and frequency inverter.

The actual control of the MOVITRAC^® B frequency inverter is implemented via process data.

Process input data (PI) and process output data (PO) are basically handled separately. This means you can define the specific process output data (setpoints) to be sent in the application from the controller to the inverter and the process input data (actual values) to be sent from the MOVITRAC^® B frequency inverter in opposite direction to the higher-level controller.

To control the inverter via communication interface, the inverter must first be switched to the relevant control signal source and setpoint source. Distinguishing between control signal and setpoint source allows for the most various combinations. For example, the drive can be controlled via fieldbus and uses the analog setpoint as setpoint. Next, the parameters for describing the process output data are used for informing the frequency inverter how to interpret the received process data.

Parameter P100 setpoint source is used to specify the communication interface which the frequency inverter uses for processing the setpoint.

Parameter P101 control signal source is used to specify how the frequency inverter is controlled. The inverter expects the control world of the source set in this parameter.

• Setting: TERMINALS
• Setting: RS485, FIELDBUS, SBus