Omron CS1W-MCH71 MOTION CONTROL UNIT - 09-2004 Manual page 542

Coordinate System
Multi-turn data
32767
0
−32768
Machine coordinate
system
0
Using as Unlimited Length
Axis
• When the servo parameter [Pn205: Multi-turn limit setting] is 65535
(default setting), the multi-turn data will change as shown below:
Multi-turn data
32767
0
−32768
• There will be no problem if the axis is used within the range where the
multi-turn data is between –32768 to 32767. However, if the power is
turned OFF once, and ON again when the axis is outside of the range, the
present position cannot be read correctly. No alarm will occur.
• If origin setting is executed near the limit of the multi-turn data, a slight
movement will make the axis exceed the limit. Therefore, always initialize
the multi-turn data of the encoder before executing origin setting.
• The operation that the axis is used within the ranges where the multi-turn
data is reset or not reset is shown below:
The range that can be used normally
Within this range, the data from the absolute
encoder is unique. Thus, the present position is
constantly unique.
Same as the case of limited length axis, to execute the axis operation within
the range where the multi-turn data is not reset, use the same setting as the
one for the limited length axis. However, to execute the axis operation exceed-
ing the limit of the multi-turn data, it is required to match the reset timing of the
coordinate system managed in the MC Unit and the reset timing of the
Section 9-3
Rotation amount
Rotation
amount
Rotation
amount
519