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12 CONTROL SUB FUNCTIONS
12.4 Functions to limit the control
12.4.1 Speed limit function
Functions to limit the control include the "speed limit function", "torque limit function",
"software stroke limit function", "hardware stroke limit function", and "forced stop
function". Each function is executed by parameter setting or PLC program creation and
writing.
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
Machine OPR control
OPR
control
Fast OPR control
Position
control
Major
positioning
control
1 to 4-axes Speed control
Speed-position switching control,
Position-speed switching control
Other
control
JOG operation, Inching operation
Manual
control
Manual pulse generator operation
: Always set
– : Setting not required (Setting value is invalid. Use the initial values or setting values
within a range where no error occurs.)
1-axis linear control
2 to 4-axes linear
interpolation control
1-axis fixed-feed control
2 to 4-axes fixed-feed
control (interpolation)
2-axis circular interpolation
control
Current value changing
JUMP instruction, NOP
instruction, LOOP to
LEND
12 - 23
MELSEC-Q
Speed limit function
Speed limit value
Pr.8
–
Setting value invalid
–
Pr.31
–
Setting is invalid
Speed limit
value
JOG speed
limit value
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