Effect Of The Directional Enables - Siemens simatic et 200s Operating Instructions Manual

You can see from the following table what effect the hardware limit switches have in the
individual MODEs:
MODE
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Inching
Absolute Positioning
Relative Positioning
Starting on the hardware limit switch
Direction
Starting into the operating range
Starting away from the operating range
4.6.3

Effect of the Directional Enables

Definition
Using control bits DIR_M and DIR_P, you can enable control of the drive in the
corresponding direction:
● With DIR_M = 1 you can move in the minus direction.
● With DIR_P = 1 you can move in the plus direction.
Interrupting and Continuing the Run
If you reset the relevant directional enable during a run, the motion of the axis is halted by
deceleration to 0 V at the analog output, and the run is interrupted.
If you set the relevant directional enable again, the run is continued.
ET 200S Positioning
Operating Instructions, 05/2007, A5E00124871-04
Effect of the Hardware Limit Switches
The 1PosInc/Analog automatically reverses the direction using
deceleration and acceleration when a hardware limit switch is reached.
The motion of the axis is halted at the hardware limit switch with the output
of 0 V on the analog output, and the feedback bit POS_ERR is reported.
Response of the 1PosInc/Analog
The 1PosInc/Analog starts the specified MODE.
The POS_ERR=1 feedback bit is set.
1PosInc/Analog
4.6 Functions of the 1PosInc/Analog
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