Omron CJ1M-CPU21 Operation Manual page 202

Origin Search and Origin Return Functions
Explanation of the Origin Search Parameters
Operating Mode
Operating
mode
Origin Input
Signal
0 The origin position
is determined
when the Origin
Input Signal goes
from OFF to ON.
1
2
The operating mode parameter specifies the kind of I/O signals that are used
in the origin search. The 3 operating modes indicate whether the Error
Counter Reset Output and Positioning Completed Input are used.
I/O signal
Error Counter
Reset Output
Not used.
The origin search
operation ends
after the origin is
detected.
Goes ON for 20 to
30 ms when the
origin is detected.
The following table shows the proper operating mode settings for different
drivers and applications.
Driver
Stepping motor driver (See note.)
Servo driver
Note There are stepping motor drivers that are equipped with a positioning com-
pleted signal like a Servo driver. Operating modes 1 and 2 can be used with
these stepping motor drivers.
■
Remarks: Operations Detecting the Origin During Deceleration from High
Speed
Operating Mode 0 (without Error Counter Reset Output, without
Positioning Completed Input)
Connect the sensor's open collector output signal to the Origin Input Signal.
The Origin Input Signal's response time is 0.1 ms when set as a NO contact.
When the Origin Proximity Input Signal is received, the motor will begin decel-
erating from the origin search high speed to the origin search proximity speed.
In this operating mode, the Origin Input Signal will be detected if it is received
during this deceleration and an Origin Input Signal Error (error code 0202) will
be generated. In this case, the motor will decelerate to a stop.
Positioning Completed
Input
Not used.
After the origin is
detected, the origin
search will not be end
until the Positioning
Completed Input is
received from the driver.
Remarks
Use this mode when you want to
reduce the processing time, even at the
expense of positioning accuracy. (The
Servo Driver's positioning complete
signal is not used.)
Use this mode when you want high
positioning accuracy. (The Servo
Driver's positioning complete signal is
used.)
Section 6-3
Remarks
Operation when the origin is
detected during deceleration from
the origin search's high speed
The Origin Input Signal will be
detected during deceleration. An Ori-
gin Input Signal Error (error code
0202) will occur and the motor will
decelerate to a stop.
The Origin Input Signal will not be
detected during deceleration. When
the Origin Input Signal is detected
after the motor has reached the prox-
imity speed for origin search, the
motor will be stopped and the origin
search operation will end.
Operating mode
0
1
2
173