Override; Overview; Override Operation - Omron CJ1W-NC271 - 12-2009 Operation Manual

Override

10-3 Override

10-3-1 Overview

10-3-2 Override Operation

Axis Operating Output Memory Areas (Operating Commands)
376
The override operation is used to change the speed of an active axis. While
the Override Enable Bit is ON, the target speed is changed by applying the
override value that is set in the Axis Operating Output Memory Area.
The override can be set from 0.01% to 327.67% in units of 0.01%. The speed
command values (Speed command value for speed control in speed control
mode) set for direct operation, origin return, jogging, and speed control opera-
tions are taken to be 100%.
The override function is disabled during origin search or torque control.
The target speed when override is enabled is as follows:
Target speed = Speed command value ×
The override function can be used for the following operations.
• Enabling an Override for a Series of Operations
Set the override beforehand, and execute each operating command with
the Override Enable Bit turned ON. The target speed for the operation will
be the initial speed command value multiplied by the override.
• Switching between Enabling and Disabling Override during Axis Opera-
tion
When the Override Enable Bit is turned ON for an active axis performing
direct operation, origin return, or jogging operation, the speed will change
to the above target speed using the acceleration/deceleration set in the
Servo Parameters for acceleration/deceleration (the acceleration/deceler-
ation speed enabled for the present operation).
When using speed control, the speed can be changed without using accel-
eration/deceleration by using the Override Enable Bit during axis opera-
tion, however, the linear acceleration/deceleration curve can be applied to
the speed change by setting the Soft Start Acceleration/Deceleration Time
in the Servo Parameters. (For details on the acceleration/deceleration
curve, refer to 7-4 Acceleration and Deceleration Operations. For details
on speed control, refer to 10-5 Speed Control.)
If the Override Enable Bit is turned OFF, the speed is changed in the same
way as when the Override Enable Bit was ON from the present target
speed (speed command value multiplied by override value) to the speed
set in the speed command value.
Name
Override Enable Bit
Override
a = Beginning word of Axis Operating Output Areas specified in Common
Parameters + (Axis No. −1) × 25
Override
10000
Word Bits
a 14 0: Override disabled.
1: Override enabled.
a+14 --- Override ratio
Unit: 0.01%
Command range: 1 to 32,767 (0001
hex to 7FFF hex)
Section 10-3
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