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3 Function Principle of the Application Example

Function Principle of the Application

Example

Program overview

Figure 3-1: Program overview

Main [OB1]

3.1

Commands DPWR_DAT and DPRD_DAT

The "SINA_SPEED" block establishes the cyclic communication to a SINAMICS

drive. To do this, the block accesses the following command:



DPWR_DAT (writing consistent data of a DP standard slave)



DPRD_DAT (reading consistent data of a DP standard slave)

These instructions ensure that the consistency is maintained across the entire

process data, i.e. all elements of the process data of a device are from the same

bus cycle or are transferred within a bus cycle.

Note

For more information on the commands DPWR_DAT and DPRD_DAT refer to

the Online Help of the TIA Portal.

Drehzahlachse mit SINA_SPEED

Entry-ID: 109485727,

V1.0,

SINA_SPEED

[FB 285]

User program

06/2017

DPWR_DAT

DPRD_DAT

Instructions

InstSina

Speed

[DB 285]

Data blocks