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MITSUBISHI CNC
III Functional Specifications
8.1 Spindle Functions (S)
8.1.1 Spindle Control Functions
The spindle rotation speed is determined in consideration of the override and gear ratio for the S command
commanded in automatic operation or with manual numerical commands, and the spindle is rotated. The
following diagram shows an outline of the spindle control.
When an 8-digit number following address S (S0 to S±99999999) is commanded, a signed 32-bit binary data
and start signal, or a non-signed 32-bit binary data and start signal will be output to the PLC.
Up to 1 set of S commands can be commanded in one block.
Processing and complete sequences must be incorporated on the PLC side for all S commands.
S
8-digit
command
(Machining program,
manual numerical
command)
Spindle controller
MDS-D/DH-SP
series, etc.
Remote I/O unit
D/A converter
Analog spindle
(1) The override can be designated as 50% to 120% in 10% increments or 0% to 200% in 1%
increments (with built-in PLC specifications).
The override is not changed while the spindle stop input is ON, during the tapping mode, or during
the thread cutting mode.
(2) The number of gear steps can be commanded up to four steps.
(3) The max. spindle rotation speed can be set for each gear.
III - 98
NC
S command
analysis
Changeover
(Parameter)
Spindle output
command
creation
Gear ratio
Max. rotation
speed
(Parameter)
S command value
Start signal
Spindle rotation
8-digit
command
BIN
Spindle rotation
8-digit BIN
command
Gear selection
Override
PLC
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