Omron CJ1W-NC271 - 12-2009, Operation Manual

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Origin Search Operation
Section 8-2
Timing Chart
Note If the origin search preset is used, the PCU Positioning Completed Flag, No
Origin Flag, and Busy Flag will change status only after the present position
preset operation is completed after finishing the origin search operation.
Transferring Parameters during Origin Search Operations
The Position Control Unit can transfer Servo Parameters during axis opera-
tions (i.e., while the Busy Flag is ON). With Position Control Units with unit
version 2.0 or later, Servo Parameter transfers specified during origin search
operation are performed after completing the origin search.
Example: The following example illustrates reading Servo Parameters during
an origin search operation.
8-2-6 Origin Search Preset
The present position can be set to any desired position after completing an
origin search. This enables setting an arbitrary electrical origin point corre-
sponding to the mechanical origin point.
This function can be used only with Position Control Units with unit version 2.0
or later.
The origin search preset operation is selected using the following Origin
Search Preset parameter in the Axis Parameters.
3E8 hex (1000)
Speed command value
(words a+4, a+5)
ORIGIN SEARCH
(word a, bit 06)
Forward rotation limit input
Origin proximity input
Origin input
Speed
PCU Positioning Completed
Flag (word b, bit 05)
No Origin Flag
(word b, bit 06)
Origin Stop Flag
(word b, bit 07)
Busy Flag
(word b, bit 13)
a = Beginning word of Axis Operating Output Areas specified in Common Para (Axis No.
−
1)
×
25
b = Beginning word of Axis Operating Input Areas specified in Common Para (Axis No.
−
1)
×
25
Time
After starting the origin search, the Busy Flag turns ON
until the origin search operation has completed.
Make sure that the ORIGIN SEARCH Bit remains ON until
the Busy Flag turns ON.
1
0
1
0
1
0
The PCU Positioning Completed Flag is turned ON when the
number of the Servo Drive's deviation counter residual pulses is
less than the value set for the positioning completion range.
Depending on the number of deviation counter residual pulses
when pulse output has been completed, a delay may occur in
the time between when the pulse output from the Position
Control Unit is completed until positioning has been completed.
Origin search operation in progress Origin search operation completed
SAVE SERVO PARAMETER Bit
(word a+1, bit 13)
Servo Parameter Transferring Flag
(word b, bit 14)
Busy Flag (word b, bit 13)
When using Position Control Units with unit version
2.0 or later, any Servo parameter read operations
specified during an origin search will be performed
after the origin search has been completed.