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MELSEC-A
12 CONTROL AUXILIARY FUNCTIONS
12.4.5 Servo ON/OFF function
The "servo ON/OFF function" performs the servo ON/OFF of the servo amplifier, which
is connected to the AD75, from the AD75.
Performing servo ON makes the servo operable.
Performing servo OFF puts the servomotor in a free run status, so that the axis can be
moved by external force when a machine system fault occurs, for example.
The servo ON/OFF status of the servo amplifier can be confirmed using "
Md.116
Servo status (b1: Servo ON)".
Important
Always switch the servo ON when performing positioning control.
Control cannot be performed in a servo OFF status.
The following details will be explained for the "servo ON/OFF function".
(1) Servo ON method
(2) Servo OFF method
(3) Restart at servo OFF to ON
(1) Servo ON method
Servo ON includes all axes servo ON and axis-by-axis servo ON.
(a) All axes servo ON commands the servo amplifiers of all axes to perform
servo ON.
Turn ON the all axes servo ON signal (Y15) when the following conditions
are satisfied.
•
No errors are detected in the servo amplifiers.
•
The "
Cd.100
Servo OFF command" (buffer memory address: 1179 (Axis
1), 1229 (Axis 2), 1279 (Axis 3)) is "0".
If an error is detected in any of the servo amplifiers during all axes servo
ON, servo OFF is carried out on only the axis where the error has occurred.
(b) Axis-by-axis servo ON returns the axes, where servo OFF was performed, to
the servo ON status on an axis basis when the all axes servo ON signal
(Y15) is ON (during all axes servo ON).
When the following conditions are satisfied, set the data indicated in the
following table.
•
No errors are detected in the servo amplifiers.
•
The all axes servo ON signal (Y15) is ON.
Buffer memory address
Setting item
Setting
value
Setting details
Axis 1 Axis 2 Axis 3
Cd.100
Servo OFF
command
0 Set "0: Servo ON". 1179 1229 1279
* Refer to section "5.7 List of control data" for the setting details.
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