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higher than the ORIGIN SEARCH high speed number. If there is no origin
proximity signal, the speed designated here is used for the entire ORIGIN
SEARCH operation.
DM word m+1, bits 07 to 04
Set to an integer between 1 and F (hex). The speed number set here refers
to one of the speeds set in DM words m+82 through m+96. The speed desig-
nated here is used only if an origin proximity signal is present.
DM words m+2 and m+3
Set DM word m+2 to a value between 0000 and 9999 pulses.
Set bit 00 of DM word m+3 to set the direction of compensation:
0:
CW
1:
CCW
There may be cases where it is difficult to establish the mechanical origin
with precision. In such cases you may want to compensate by establishing
the origin a few pulses to either side of the origin signal input. If you want the
position determined by origin signal input to be treated as the origin (position
0), set word m+2 to 0. Otherwise set the value and direction necessary to
obtain the required origin. If there is an origin compensation value set in word
m+2, then, after reaching the position determined by origin signal input, com-
pensation will be executed at proximity speed in the direction set at bit 00 of
word m+3. See the example given below and
Section 4–2–3 for application.
In the example diagram below, bit 00 of DM word m+3 is set at 1, so origin
compensation is counterclockwise.
Proximity signal
Origin signal
Pulse output
CCW
Deceleration
Search direction: CCW
Acceleration
Initial speed
positioning axis
Compensation
CW
ORIGIN SEARCH high speed
0.5 s pause
Proximity speed
Proximity speed
4–3–2
IR Area Settings
In C200H PCs, IR words 100 to 199 are used for Special I/O Units. When a
Position Control Unit is used, they are allocated as I/O refresh areas. For a
detailed explanation, see
Section 3–4. For a detailed table of words and bits
in the IR area, see
Appendix D.
In the IR area, the ORIGIN SEARCH command is executed with bit 02 of
word n. ORIGIN SEARCH begins when the program turns this bit ON.
ORIGIN SEARCH
High Speed Number
Origin Compensation
ORIGIN SEARCH