Omron CS1W-MCH71 -, Руководство по эксплуатации

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Overview
Section 8-1
8-1 Overview
This section describes the method of establishing the origin for motion control
systems using either incremental encoders or absolute encoders.
8-1-1 Using Incremental Encoders
In motion control systems using incremental encoders, an origin must be
established and the bit [No Origin] must be turned OFF after the power is
turned ON.
There are two ways to establish the origin using the MC Unit.
Forced Origin The position where the motor is stopped is determined as the origin (forcibly
clear to 0) by turning ON the bit [Forced Origin] in the PC Interface Area. See
“Forced Origin” (page 498) in SECTION 7 PC Interface Area for details on the
timing chart and other details.
Origin Search An origin search operation can be performed by turning ON the bit [Origin
Search] or by executing DATUM command (Origin Search).
■
Origin Search in Manual/Automatic Mode
Following the method of determining an origin, use one of the methods
depending on the mode of each task as shown below:
Yes: Can be used, No: Cannot be used
Operation Description
Forced Origin The position where the motor is stopped is defined as an ori-
gin.
Origin search Actually moving the motor and using the limit switches, origin
proximity switches, and encoder’s phase-Z signal determine
an origin.
If the origin search method is set to “Origin at power ON” in
the system parameter, the Unit will automatically define the
position where the power is turned ON as the origin, without
moving the motor.
Word Variable Bit Name Description
x+0
-
x+31 IW0440
-
IW045F 09 Forced Origin (Axis 1)
-
Forced Origin (Axis 32) 0: Nil
1: Nil
↑
: The present position is defined as the origin on the
machine coordinate system (disabled during operation).
↓
: Nil
Word Variable Bit Name Description
x+0
-
x+31 IW0440
-
IW045F 06 Origin Search (Axis 1)
-
Origin Search (Axis 32) 0: Nil
1: Continues origin search
↑
: Starts origin search
↓
: Stops origin search
Method Manual Mode Automatic Mode
Forced Origin bit Yes No
Origin Search [Origin Search] bit Yes No
DATUM No Yes