Chapter 7 Control Sub Functions; Outline Of Sub Functions - Mitsubishi Electric MELSEC iQ-FX5 User Manual

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CONTROL SUB FUNCTIONS
The details and usage of the "sub functions" added and used in combination with the main functions are explained in this
chapter.
A variety of sub functions are available, including functions specifically for machine home position return and generally related
functions such as control compensation, etc. More appropriate, finer control can be carried out by using these sub functions.
Each sub function is used together with a main function by creating matching parameter settings and programs. Read the
execution procedures and settings for each sub function, and set as required.
7.1

Outline of Sub Functions

"Sub functions" are functions that compensate, limit, add functions, etc., to the control when the main functions are executed.
These sub functions are executed by parameter settings, operation from the engineering tool, sub function programs, etc.
Outline of sub functions
The following table shows the types of sub functions available.
Sub function
Functions characteristic Home position return retry
to machine home function
position return
Home position shift
function
Functions that Backlash compensation
compensate control function
Electronic gear function
Near pass function
Functions that limit Speed limit function
control
Torque limit function
Software stroke limit
function
Hardware stroke limit
function
Forced stop function
Functions that change Speed change function
control details
Override function
Acceleration/deceleration
time change function
Torque change function
Target position change
function
Functions related to Pre-reading start function
positioning start
Absolute position system function
Details
This function retries the home position return with the upper/lower limit switches during machine
home position return. This allows machine home position return to be carried out even if the axis is
not returned to before the proximity dog with JOG operation, etc.
After returning to the machine home position, this function compensates the position by the
designated distance from the machine home position and sets that position as the home position
address.
This function compensates the mechanical backlash. Feed command equivalent to the set backlash
amount are output each time the movement direction changes.
By setting the movement amount per pulse, this function can freely change the machine movement
amount per commanded pulse.
When the movement amount per pulse is set, a flexible positioning system that matches the machine
system can be structured.
*1
This function suppresses the machine vibration when the speed is changed during continuous path
control in the interpolation control.
If the command speed exceeds "[Pr.8] Speed limit value" during control, this function limits the
commanded speed to within the "[Pr.8] Speed limit value" setting range.
If the torque generated by the servomotor exceeds "[Pr.17] Torque limit setting value" during control,
this function limits the generated torque to within the "[Pr.17] Torque limit setting value" setting range.
If a command outside of the upper/lower limit stroke limit setting range, set in the parameters, is
issued, this function will not execute positioning for that command.
This function carries out deceleration stop with the hardware stroke limit switch.
This function stops all axes of the servo amplifier with the forced stop signal.
This function changes the speed during positioning.
Set the changed speed in the speed change buffer memory ([Cd.14] New speed value), and change
the speed with the speed change request ([Cd.15] Speed change request).
This function changes the speed within a percentage of 1 to 300% during positioning. This is
executed using "[Cd.13] Positioning operation speed override".
This function changes the acceleration/deceleration time during speed change.
This function changes the "torque limit value" during control.
This function changes the target position during the execution of positioning. At the same time, this
also can change the speed.
This function shortens the virtual start time.
This function restores the absolute position of designated axis.
7 CONTROL SUB FUNCTIONS
7.1 Outline of Sub Functions
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