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Pulse Outputs Section 5-3
5-3-5 Origin Search and Origin Return Functions
The CP1H CPU Units have two functions that can be used to determine the
machine origin for positioning.
1,2,3... 1. Origin Search
The ORG instruction outputs pulses to turn the motor according to the pat-
tern specified in the origin search parameters. As the motor turns, the ori-
gin search function determines the machine origin from the following 3
kinds of position input signals.
• Origin input signal
• Origin proximity input signal
• CW limit input signal and CCW limit input signal
2. Changing the Pulse Output PV
When you want to set the current position as the origin, execute INI(880)
to reset the pulse output PV to 0.
The origin location can be determined after using either method.
The CP1H CPU Units are also equipped with the origin return function, which
can be executed to return the system to the origin after the origin location has
been determined by one of the methods above.
• Origin Return
If the motor is stopped, ORG(889) can be executed to perform an origin
return operation that moves the motor back to the origin position. The ori-
gin position must be determined in advance by performing an origin
search or changing the pulse output PV.
Note The motor can be moved even if the origin position has not been determined,
but positioning operations will be limited as follows:
• Origin return: Cannot be used.
• Positioning with absolute pulse specification: Cannot be used.
• Positioning with relative pulse specification: Outputs the specified number
of pulses after setting the current position to 0.
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