Siemens simatic et 200s Operating Instructions Manual page 32

1STEP 5V/204kHz
2.6 Functions of the 1STEP 5V/204kHz
SYNC Status Bit
The SYNC status bit informs you that the axis has been synchronized, that is, after the
correct search for reference, this status bit is set and deleted during the run.
The SYNC status bit is deleted
● After parameter assignment of your ET 200S station
● After deletion of the pulse enable
● After a CPU-/Master-STOP
In these cases it is advisable to carry out a search for reference.
Status Bits POS and POS_RCD
While search for reference is active, it is indicated by the POS feedback bit.
On completion of a correct search for reference, the POS_RCD feedback bit indicates that
the position has been reached.
If the search for reference is interrupted, the feedback bit POS_RCD is not displayed.
Residual distance
The residual distance reported is irrelevant during the search for reference.
Note
To ensure that the 1STEP 5V/204kHz can reproduce reference points accurately, the period
of the start-stop frequency must be longer than the signal delay of the REF digital input. You
must therefore approach the reference points with start-stop frequencies lower than 100 Hz.
In the case of start-stop frequencies F
reduction factor R in the relevant positioning job; this enables you to reach the corresponding
start-stop frequency without changing the parameters.
If you stop at the reference cam or limit switch during the acceleration phase, the 1STEP
5V/204kHz continues to send pulses for 50 ms at the frequency already reached before it
starts braking. This avoids abrupt changes in frequency, which can lead to step losses.
See also
Assignment of the Feedback and Control Interfaces (Page 44)
Stopping the Stepping Motor (Page 37)
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greater than 100 Hz, you can do this using the
ss
Operating Instructions, 05/2007, A5E00124871-04
ET 200S Positioning