Yaskawa YASNAC PC NC I/O Signal Function Manual - Manual (Page 32)

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YASNAC PCNC I/O Signal Function Manual Chapter 4: M, S, T, and B Functions
4.3 Gear Range Selection Input and Output Signals
When an S command is executed, the CNC checks the maximum speed commands of the
individual gear ranges while at the same time it outputs the SF, and then outputs the gear
selection command (GR1S to GR4S) meeting the secified S command.
It then compares the present gear range and returns the FIN if the present gear range is the
same as the output gear selection command. If the gear range must be changed, the CNC
enters the gear range selection sequence. If a fixed speed output is necessary for changing
the gear range, the CNC closes the GRO. The CNC outputs the fixed speed signal by giving
top priority to this signal.
“Open” the gera range selection inut signal (GR1 to GR4) before the completion of gear
range selection and return the S gear range selection finish (SFIN) at the completion of gear
selection range. The specified spindle speed command is then output as the non-contact or
D/A output signal.
Then return the FIN when spindle speed agrees with the specified spindle speed.
(1) Gear Selection Signal Output Timing
When an S command is read, the controller judges whether or not the gear range must
be changed and exceutes necessary range selection automatically. How this is exceuted
is shown in the time chart shown in Fig. 4.9.
In this example, gear range of GR@ is selected by the commands of “S1000 M03” and
a new spindle speed command “S2000” is specified which requires the gear range to be
changed to GR3.
SEQUENCE:
1.The CNC judges that gear range must be changed to GR3 and and outputs GR3S signal.
2.At the machine side, this signal (GR3S) should be read by the read-command SF which
has a time delay of “t”, and the gear range should be changed. If the spindle motor must be
rotated to execute gear range change, “open” the GRO.
3.After the completion of gear range changing to GR3, “open” GR3 input and then “open”
SFIN (S command finish input).
4.At the time the SFIN is “opened”, a new S command is calculated and sent.
Gear Range Selection Command Output GR1S to GR4S #36504 to #36507
S Function Finish Input SFIN #31117