1STEP 5V/204kHz
2.6 Functions of the 1STEP 5V/204kHz
ET 200S Positioning
Operating Instructions, 05/2007, A5E00124871-04
33
2.6.3 Sequence of Execution of the Search for Reference
Steps of the Search for Reference
A search for reference consists of a maximum of three sections.
In the first section (1) and second section (2), the system ensures that the reference cam is
found.
Both these sections are executed at the defined output frequency F
a
.
In the third section (3), the reference cam is approached with start-stop frequency F
ss
in the
selected direction up to the reference point
with reproducible accuracy.
Note
Each section can have a maximum of only 1048575 pulses.
Different Execution Sequences
Depending on the position
3
at the start of the search for reference, there are different
execution patterns for the run (REF is the reference cam, which is wired to the REF digital
input). The illustration applies to the forward starting direction (DIR_P).
Start before REF or at Limit Switch LIMIT_M
5()/,0,7B0 /,0,7B3



',5B3
3
)
D
)
VV
Figure 2-5 Search for Reference, Start before REF
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