Omron CS1W-MC221 -, Operation Manual

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371
Unlimited Feeding Section 6-20
position will be updated as shown in the following diagram if a range of 0
°
to
360
°
is set. The number of turns will be remembered.
Note Setting these machine parameters will set unlimited feeding.
6-20-1 Setting System Parameters
The following system parameter must be set when using the unlimited feeding
function:
• Axis mode (machine parameter): Unlimited Feed Mode
This parameter must be set using the CX-Motion. The IORD instruction can
only be used to read the parameter setting. For addresses, refer to
3-3-4 Data
Configuration for System Parameters .
When Unlimited Feed Mode is set as the axis mode, the software limits will
not operate regardless of whether or not the origin has been determined.
The present position is set by the ring counter method at the value determined
by the positive and negative software limits, using the minimum setting unit,
so in the Unlimited Feed Mode be sure to set the origin (0) between the posi-
tive and negative software limits. (Refer to the examples below.)
The positive and negative software limits are set in the same way by CX-
Motion. The IORD instruction can be used to read the parameter settings. For
addresses, refer to
3-3-4 Data Configuration for System Parameters .
Example 1 In this example, the display unit is degrees, the minimum setting unit is 0.1,
the negative software limit is 00, and the positive software limit is 360.0. The
present position will be between 0.0 and 359.9.
Example 2 In this example, the display unit is degrees, the minimum setting unit is 0.1,
the negative software limit is 360.0, and the positive software limit is 360.0.
The present position will be between –360.0 and 359.9.
All axis operation commands can be used with the Unlimited Feed Mode. For
example, an error would normally be generated for G01 if the origin is not
determined, but that command can be used if the axis mode is set to Unlim-
ited Feed Mode.
Note When the present position update range is converted to pulses, select a gear
ratio and encoder resolution such that it will be expressed in integers. If it is
not in integers, the errors will accumulate whenever the present position
update range is exceeded, and correct positioning will not be possible.
Turn counter
Time
Present position
Example settings: Machine parameters
Axis mode: Unlimited Mode (See note.)
Display unit: Degrees
Minimum setting unit: 0.1
Minus direction software limit: 0 (See note.)
Plus direction software limit: 360 (See note.)