Spindle Functions; Spindle Functions (S2-Digits Bcd); Spindle Functions (S6-Digits Analog) - Mitsubishi Electric MELDAS C6 Programming Manual

10. Spindle Functions

10. Spindle Functions
10.1 Spindle functions (S2-digits BCD) ..... During standard PLC specifications
Function and purpose
The spindle functions are also known simply as S functions and they assign the spindle rotation
speed. In this controller, they are assigned with a 2-digit number following the S code ranging from
0 to 99, and 100 commands can be designated. In actual fact, however, it depends on the machine
specifications as to how many of these 100 functions are used and which numbers correspond to
which functions, and thus reference should be made to the instruction issued by the machine
manufacturer. When a number exceeding 2 digits is assigned, the last 2 digits will be valid.
When S functions are commanded in the same block as movement commands, there are 2
sequences in which the commands are executed, as below. The machine specifications determine
which sequence applies.
(1) The S function is executed after the movement command.
(2) The S function is executed simultaneously with the movement command.
Processing and completion sequences are required for all S commands from S00 to S99.

10.2 Spindle functions (S6-digits Analog)

Function and purpose
When the S6-digits function is added, commands with a 6-dight number following the S code can
be designated. Other commands conform to the S2-digits function.
By assigning a 6-digit number following the S code, these functions enable the appropriate gear
signals, voltages corresponding tot he commanded spindle speed (r/min) and start signals to be
output.
If the gear step is changed manually other than when the S command is being executed, the
voltage will be obtained from the set speed at that gear step and the previously commanded speed,
and then will be output.
The analog signal specifications are given below.
(1) Output voltage.............. 0 to 10V
(2) Resolution .................... 1/4096 (2
(3) Load conditions............ 10k Ω
(4) Output impedance........ 220 Ω
If the parameters for up to 4 gear stages are set in advance, the gear stage corresponding to the S
command will be selected and the gear signal will be output. The analog voltage is calculated in
accordance with the input gear signal.
(1) Parameters corresponding to individual gears .......Limit rotation speed, maximum rotation
(2) Parameters corresponding to all gears ..................Orientation rotation speed, minimum

10.1 Spindle functions (S2-digits BCD)

–12
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speed, shift rotation speed and tapping
rotation speed
rotation speed
75