Present Position Preset - Omron CS1W-MC221 - 02-2008 Operation Manual

Present Position Preset

Automatic loading command
(IOWR instruction)
Autoloading Error Reset Bit
(n, 05)
Autoloading Error Flag
(n+10, 05; n+18, 05)
Autoloading Flag
(n+10, 04; n+18, 04)
Autoloading Time Up Flag
(n+10, 15; n+18, 15)
When an error is detected during
automatic loading.
The time is monitored from when CX-Motion receives
the job number and automatic loading is executed.
Monitor the time from the ladder program. (See note.)
6-17 Present Position Preset
Overview
!Caution When present position preset is executed for an axis for which an absolute
Error Flag will turn ON. If that occurs, the data transferred up to that point will
be discarded.
Job number
Note The MC Unit does not monitor the time from when it receives the automatic
loading command until the Autoloading Flag turns ON. There may be cases
where the power to the personal computer is turned OFF or a cable is discon-
nected, so monitor this time from the ladder program.
Mode: Manual; Method: Command Area designation
The present position preset function is used to preset the preset position to
any given value. With previous MC Unit models, it was executed from the PLC
Interface Area, but with the MC221 and MC421 it is executed by an IOWR
instruction using the Command Area. It can only be used in Manual Mode,
and will be ignored if used in Automatic Mode.
After the present position has been preset, the reference origin is established
automatically, so there is no need to execute an origin search. It is also possi-
ble to set the present position as the origin by using the present position pre-
set function to set the present position to "0."
encoder is used, only the present position stored in the MC Unit will be preset.
The present position stored in the absolute encoder will not be preset, and it
will be automatically updated with the next servo-lock.
10 s
When automatic loading is completed
normally.
If communications are not restarted by the time the
Autoloading Time Up time set in the system parame-
ters (10 s in this case) has elapsed (e.g., because of
a cable disconnection, noise, etc.), the data trans-
ferred up to this point will be discarded.
Section 6-17
363