This document is an update to the SIMATIC S7-200 SMART System Manual, edition 10/2013. It includes updates on the use of the AXISx_ABSPOS subroutine to read the absolute position from a SINAMICS V90 servo drive and on the use of USS communications with the Siemens V90 servo drive.
This document provides updates to the S7-200 SMART System Manual, addressing incomplete or incorrect information in the original. It includes fixes for using the AXISx_ABSPOS subroutine with SINAMICS V90 servo drives, USS communications, CPU input characteristics, and motion control issues. It also covers analog limit values, thermocouple support, and TD400C display problems. The updates are technical and aimed at users configuring motion control systems with Siemens PLCs and servo drives.
The manual details parameter settings, subroutine interfaces, and commissioning steps for proper operation, including RS485 communication, electronic gearing, and mechanical factors. It references other Siemens documents for advanced features and wiring diagrams.
The subroutine reads the absolute position from the drive using serial RS485 communication. Set the Drive parameter to the RS485 address (0–31), Port to the CPU port (0 or 1), and ensure RDY and INP inputs are on. The subroutine writes the position to D_Pos when Done is ON and Error is "no error".
The valid range for the electronic gear ratio (a / b) is between "0.02" and "200".
The default control mode is basic "PTI" mode, which allows movement speed and distance to be controlled from an external pulse train. Check parameter "p29003" to verify the mode setting.