Relative Positioning (Mode 4) - Siemens simatic et 200s Operating Instructions Manual

1PosSSI/Digital
5.6 Functions of the 1PosSSI/Digital
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
The preset distance is not checked by the 1PosSSI/Digital. This means that more than one
revolution may be involved with rotary axes.
Figure 5-11
214
has elapsed.
min
Execution of Relative Positioning
Operating Instructions, 05/2007, A5E00124871-04
ET 200S Positioning