Siemens SIMATIC ET 200S - Relative Positioning (MODE 4); Figure 3-16 Execution of Relative Positioning

1PosInc/Digital
3.6 Functions of the 1PosInc/Digital
ET 200S Positioning
84 Operating Instructions, 05/2007, A5E00124871-04
3.6.8 Relative Positioning (MODE 4)
Definition
In relative positioning the 1PosInc/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 1PosInc/Digital moves the drive at the preset speed
(SPEED control bit) for that distance. At the switchover point the 1PosInc/Digital switches
from rapid feed to creep feed, and at the switch-off it terminates the run.
If you start during an active run, the 1PosInc/Digital executes the necessary change in
direction after the time T
min
has elapsed.
The preset distance is not checked by the 1PosInc/Digital. This means that more than one
revolution may be involved with rotary axes.
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Figure 3-16 Execution of Relative Positioning