Here is some information on the EM253 positionning module, from the S7-200 Programmable Controller system manual(S7-200_e.pdf ):
The EM 253 Position Module provides a single pulse train output with integrated direction control,
disable and clear outputs. It also includes dedicated inputs which allow the module to be
configured for several modes of operation including automatic reference point seek. The module
provides a unified solution for open loop control of the speed and position for either stepper
motors or servo motors.
To simplify the use of position control in your application, STEP 7--Micro/WIN provides a Position
Control wizard that allows you to completely configure the PWM, PTO or Position module in
minutes. The wizard generates position instructions that you can use to provide dynamic control of
speed and position in your application. For the Position module STEP 7--Micro/WIN also provides
a control panel that allows you to control, monitor and test your motion operations.
I hope this answers your question, as it is not completely clear to me what you need exactly.
In any case, the best source of information would be the manual mentionned earlier (Chapter 9 has a very detailed description of the programming and configuration of the EM253, and Appendix A shows diagrams for connecting the module to different types of motors), and of course the Online Help of MicroWin.
Hope this helps,