
B-63323EN-1/02 14.PMC CONTROL FUNCTION
- 1335 -
- Feedrate command
PMC BMI CNC
Axis
control
Feedrate
command
Axis control
block data
signal
Feedrate
command
Rotation
speed data
Axis control data
Feedrate
command
skip signal
PMC axis control
override signal
Stop
command
Override
Signal
Axis management
(rotation axis)
Motor
Velocity
control
Servo
control
When this signal is turned on,
Fig. 14.1 (a) Block Diagram for Feedrate Command Specification
The feedrate command (CDxX7 to CDxX0: 0Dh) can be specified
only for rotation axes. This command is useful when a rotation axis
merely needs to keep rotating. When this command is specified for a
rotation axis, the axis will turn at a constant speed without interrupting
the pulse distribution.
The rotation axis being turned by the feedrate command is stopped by
setting the feedrate command skip input signal VCSKPx corresponding
to this axis to 1. As the CNC accepts this signal, the CNC terminates
the specified feedrate command block and, if a second PMC axis
control command block is present, the CNC executes this block.
For the axis controlled by the feedrate command, make the rotation axis
setting by using bit 0 (ROT) of parameter No. 1006.
(1) Successive specification of the feedrate command
When blocks specifying a feedrate command are specified
successively, these blocks can be executed continuously without
stopping movement between the blocks.
To enable continuous execution, observe the following:
1. Set the block specifying the next feedrate command in the
buffer.
2. Then, set the feedrate command skip command to 1 to stop
the execution of the previous block.