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fritz · Member Joined: 26 Dec 2015 Posts: 179

Using the MC-PreServo and MC-PostServo organization blocks
https://support.industry.siemens.com/cs/document/109741575/
The MC-PreServo and MC-PostServo organization blocks are programmable and allow a program modification directly before or after the call of the MC-Servo organization block.
SIMATIC S7-1500 CPUs support the connection of drives as a speed axis or positioning axis via PROFINET, PROFIBUS or an analog drive connection.
In the present application example, a hydraulic valve is to be configured and used as positioning axis. The position is detected via an analog input of the controller.

MC-PreServo and MC-PostServo organization blocks MC-PreServo and MC-PostServo organization blocks

MC-PreServo and MC-PostServo organization blocks MC-PreServo and MC-PostServo organization blocks

For use a analog position value in the technology object, the value must be edit. The program required for this is called up in the MC-PreServo organization block.
The non-linear behavior of the hydraulic valve requires an adjustment of the set point. The program required for this is called up in the MC-PostServo organization block.

The example program, which is contained in this application example in form of a download, shows the operation of a hydraulic valve as positioning axis by use of the MC-PreServo and MC-PostServo organization blocks.
https://support.industry.siemens.com/cs/attachments/109741575/109741575_MC_PreServo_and_MC_PostServo_v10_en.pdf
https://support.industry.siemens.com/cs/attachments/109741575/109741575_MC-PreServo_and_MC-PostServo_v10.zip