YOKOGAWA F3YP14-0N, User Manual

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IM 34M6H55-02E 1st Edition : Apr 1, 2002-00
7.2.5 Origin Search
There are two ways to perform origin search: normal and automatic. In normal origin
search, the origin search behavior is arbitrarily defined by an application program; the
automatic origin search operation uses entry parameters to define the origin search
behavior.
This section describes the normal origin search operation. For details on the automatic
origin search operation, see Section 7.1.6, “Using Automatic Origin Search.”
There are three external contact inputs related to the normal origin search. The origin
search mode uses bit patterns (2 bits for each edge, 12 bits in total) to specify the
desired behavior when each rising and falling edge of these three inputs (six in total) is
detected during the origin search.
In the example below, the origin search proceeds in the negative direction with the
following behavior: (1) Stops immediately when a rising edge of the negative-direction
limit is detected. (2) Decelerates and stops when a rising edge of the origin input is
detected. (3) Shifts to a Z-phase search when a falling edge of the origin search is
detected. In this case, the origin search mode is set as follows:
0 0 0 0 1 1 0 0 0 0 0 0 1 0 0 1
(“0C09” in hexadecimal)
For the origin search mode, see Section 3.5, “Origin Search.”
Figure 7.27 Example of Origin Search Operation
Negative-
direction
limit input
Origin input
(2) (3) (1)
Negative
direction
Positive
direction
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