Siemens SIMATIC ET 200S - Page 342

1PosUniversal/Digital
7.6 Functions of the 1PosU
ET 200S Positioning
342 Operating Instructions, 05/2007, A5E00124871-04
Rotary axis
You determine the direction in which the destination is approached by selecting the
directional enable (DIR_M, DIR_P):
Control bits DIR_P and DIR_M Direction
DIR_P = 1
DIR_M = 0
The destination is approached in the plus direction.
DIR_P = 0
DIR_M = 1
The destination is approached in the minus direction.
DIR_P = 1
DIR_M = 1
The destination is approached by the shortest route. The
1PosU determines the direction the destination is to be
approached from. If the resulting distance to be traveled
is smaller than the switch-off difference, no run is started
(POS_DONE = 1).
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Figure 7-16 Execution of Absolute Positioning