Overview - Omron CS1W-MCH71 Operation Manual

Overview

8-1 Overview
8-1-1 Using Incremental Encoders
Forced Origin
Word Variable
x+0 IW0440
- -
x+31 IW045F
Origin Search
Word Variable
x+0 IW0440
- -
x+31 IW045F
532
This section describes the method of establishing the origin for motion control
systems using either incremental encoders or absolute 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.
Operation
Forced Origin
Origin search
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.
Bit Name
09 Forced Origin (Axis 1)
-
Forced Origin (Axis 32)
An origin search operation can be performed by turning ON the bit [Origin
Search] or by executing DATUM command (Origin Search).
Bit Name
06 Origin Search (Axis 1)
-
Origin Search (Axis 32)
■ 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:
Method
Forced Origin bit
Origin Search
The position where the motor is stopped is defined as an ori-
gin.
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.
0: Nil
1: Nil
↑: The present position is defined as the origin on the
machine coordinate system (disabled during operation).
↓: Nil
0: Nil
1: Continues origin search
↑: Starts origin search
↓: Stops origin search
Yes: Can be used, No: Cannot be used
Manual Mode
Yes
[Origin Search] bit Yes
DATUM No
Section 8-1
Description
Description
Description
Automatic Mode
No
No
Yes