
B-63943EN-1/02 17.PMC CONTROL FUNCTION
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(16) Speed command ( 10h )
This command performs a continuous feed operation based on a speed
command.
By using bit 0 (ROTx) of parameter No. 1006, set a rotation axis as a
controlled axis for which this command is executed.
The continuous feed command (EC0g to EC6g: 06h) exercises
position control. However, the speed command (EC0g to EC6g: 10h)
can exercise speed control on the servo motor to dynamically change
the speed during continuous feed. So, this command is suited, for
example, to an application where a servo motor drives a rotary tool.
With parameter No. 8028, a time constant for linear acceleration/
deceleration can be set for each axis.
During feed based on the speed command, no coordinates are updated.
This means that the machine position is lost. So, a reference position
return operation needs to be performed after a move command is
specified upon completion of the speed command. (The machine
position is lost also when an absolute position detector is attached.)
By setting the reset signal ECLRg to 1, this command can be ended.
At this time, the servo motor is decelerated to a stop, and the axis
moving signal EGENg is set to 0. Before specifying this command
again, check that the axis moving signal EGENg is set to 0.
Until the axis moving signal EGENg is set to 0, ensure that the reset
signal ECLRg continues to be set to 1.
Axis control block data
Signal
abbreviation
Signal address
(group 1)
Data
EC0g to EC6g G143.0 to .6 Speed command (10h)
EIF0g to
EIF15g
G144,145 Continuous feedrate
Continuous feedrate
Set the speed of the servo motor with a binary code.
Set a positive value when the servo motor rotates in the forward
direction. Set a negative value (two's complement) when the servo
motor rotates in the reverse direction.
If a new servo motor speed is set as a feedrate, and the logical state of
the axis control command read signal EBUFg is reversed, the servo
motor is accelerated or decelerated to the new speed.
Valid data range Unit
-32768 to +32767 min
-1
Related parameters
Parameter (No.8028)