Reference Point Run (Mode 3) - Siemens simatic et 200s Operating Instructions Manual

3.6.5

Reference Point Run (MODE 3)

Definition
You can use the reference point run to synchronize the axis on the basis of an external
reference signal. You can use either the 3 digital inputs or the zero mark as a reference
signal.
You can assign parameters to the digital inputs DI0 (minus limit switch) and DI1 (plus limit
switch) and DI2 (reducing cam) as break or make contacts.
Provide the control interface with the reference point coordinates, and start MODE 3. The
1PosInc/Digital sets the SYNC = 0 feedback signal and moves the drive at the preset speed
(SPEED control bit) in the assigned parameter start direction and searches for the reference
signal. The 1PosInc/Digital automatically executes the required change of direction at the
limit switches and the reducing cam.
Set the necessary directional enables (DIR_M, DIR_P) to ensure that the drive is controlled.
If the 1PosInc/Digital detects the parameterized reference signal, it controls the drive in
creep feed mode in the referencing direction. This is controlled by the reference signal and
reference switch parameters.
Reference signal:
Reference switch and
zero mark
Reference signal:
Reference switch
Reference signal: Zero
mark
ET 200S Positioning
Operating Instructions, 05/2007, A5E00124871-04
Reference switch: Reference switch:
Reduction cam Reduction cam
towards minus towards plus
Minus referencing Plus referencing
direction direction
The referencing direction is not defined. The axis is synchronized at the next zero mark.
3.6 Functions of the 1PosInc/Digital
Reference switch: Reference switch:
Limit switch minus Limit switch plus
Plus referencing Minus referencing
direction direction
1PosInc/Digital
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