Omron CS1W-MC221 -, Operation Manual

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Origin Search Operations Section 9-4
9-4 Origin Search Operations
9-4-1 Overview
This section provides basic examples of origin search operations with the ori-
gin search method set to Reverse Mode.
The following origin search is performed with an origin proximity signal input,
the initial origin search direction set to CW, and the origin search reverse con-
dition the same as the origin search direction.
Description There are three steps involved in this origin search.
1,2,3... 1. When the origin search is executed, the axis is moved in the specified di-
rection at the origin search high-speed feed rate.
2. When the origin proximity input signal is received, the search speed is re-
duced to the origin search low-speed feed rate.
3. After the origin proximity input signal goes OFF, the workpiece origin is es-
tablished at the position where the phase-Z signal goes ON. The control
voltage drops to zero at this point.
If the reference origin offset value has been preset, the axis is moved for
the value preset after retrieving the overriding value with PTP control and
the resulting position is established as the reference origin.
Basic operation and the factors causing errors change according to the
timing of the limit signal, the origin proximity signal and the phase-Z signal,
and the initial origin search direction. For details, refer to
Appendix F Origin
Search Patterns .
Note The origin search is performed with PTP control. Refer to 6-2 PTP Control for
information on the required acceleration and deceleration times.
Limit signal input
Origin proximity
signal input
Phase-Z signal
Speed
Origin search high-
speed feed rate Origin search low-
speed feed rate
Origin search start Mechanical origin
(1)
(2)
(3)
CW
CCW
Maximum feed rate