Siemens SIMATIC ET 200S - Page 211

1PosSSI/Digital
5.6 Functions of the 1PosSSI/Digital
ET 200S Positioning
Operating Instructions, 05/2007, A5E00124871-04
211
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
1PosSSI/Digital works out the direction in which the
destination is approached.
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Figure 5-10 Execution of Absolute Positioning