Siemens SIMATIC ET 200S - Relative Positioning (MODE 4)

1PosSSI/Digital
5.6 Functions of the 1PosSSI/Digital
ET 200S Positioning
214 Operating Instructions, 05/2007, A5E00124871-04
5.6.7 Relative Positioning (MODE 4)
Description
In relative positioning the 1PosSSI/Digital moves the drive from the start position in a
specified direction for a certain preset distance.
Supply the control interface with the distance to be traveled, and start MODE 4, specifying
the direction (DIR_M or DIR_P). The 1PosSSI/Digital moves the drive at the preset speed
(SPEED control bit) for that distance. At the switchover point the 1PosSSI/Digital switches
from rapid feed to creep feed, and at the switch-off point it terminates the run.
If you start during an active run, the 1PosSSI/Digital executes the necessary change in
direction after the time T
min
has elapsed.
The preset distance is not checked by the 1PosSSI/Digital. This means that more than one
revolution may be involved with rotary axes.
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Figure 5-11 Execution of Relative Positioning