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MELSEC-Q
12 CONTROL SUB FUNCTIONS
12.4 Functions to limit the control
Functions to limit the control include the "speed limit function", "torque limit function",
"software stroke limit", and "hardware stroke limit". Each function is executed by
parameter setting or sequence program creation and writing.
12.4.1 Speed limit function
The speed limit function limits the command speed to a value within the "speed limit
value" setting range when the command speed during control exceeds the "speed limit
value".
The details shown below explain about the "speed limit function".
[1] Relation between the speed limit function and various controls
[2] Precautions during control
[3] Setting the speed limit function
[1] Relation between the speed limit function and various controls
The following table shows the relation of the "speed limit function" and various
controls.
Control type Speed limit function Speed limit value
Machine OPR control
OPR
control
Fast OPR control
1-axis linear control
2 to 4-axes linear
interpolation control
1-axis fixed-feed control
2 to 4-axes fixed-feed
control (interpolation)
Position
control
2-axis circular interpolation
control
1 to 4-axes Speed control
Speed-position switching control,
Position-speed switching control
Pr.8
Speed limit
value
Current value changing –
Major
positioning
control
Other
control
JUMP instruction, NOP
instruction, LOOP to
LEND
–
Setting value invalid
JOG operation, Inching operation
Pr.31
JOG speed
limit value
Manual
control
Manual pulse generator operation
Setting is invalid
: Always set
– : Setting not required (Setting value is invalid. Use the initial values or setting values
within a range where no error occurs.)