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MELSEC-Q
12 CONTROL SUB FUNCTIONS
12.7 Other functions
Other functions include the "step function", "skip function", "M code output function",
"teaching function", "target position change function", "command in-position function",
"acceleration/deceleration processing function", "pre-reading start function",
"deceleration start flag function" and "stop command processing for deceleration stop
function". Each function is executed by parameter setting or sequence program
creation and writing.
12.7.1 Step function
The "step function" is used to confirm each operation of the positioning control one by
one.
It is used in debugging work for major positioning control, etc.
A positioning operation in which a "step function" is used is called a "step operation".
In step operations, the timing for stopping the control can be set. (This is called the
"step mode".) Control stopped by a step operation can be continued by setting "step
continue" (to continue the control)" or restarted by setting "restart" in the "step start
information".
The details shown below explain about the "step function".
[1] Relation between the step function and various controls
[2] Step mode
[3] Step start information
[4] Using the step operation
[5] Control details
[6] Precautions during control
[7] Step function settings
[1] Relation between the step function and various controls
The following table shows the relation between the "step function" and various
controls.
Control type Step function Step applicability
Machine OPR control
OPR control
Fast OPR control
Step operation not possible
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
Step operation possible
1 to 4- axes Speed control Step operation not possible
Speed-position switching control
Position-speed switching control
Current value changing
Step operation possible
Major
positioning
control
Other
control
JUMP instruction, NOP instruction,
LOOP to LEND
Step operation not possible
JOG operation, Inching operation
Manual
control
Manual pulse generator operation
Step operation not possible
: Set when required. : Setting not possible