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12 - 2 

MELSEC-Q

 

12   CONTROL SUB FUNCTIONS 

 

12.1 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, commands from GX Configurator-QP, sub function PLC programs, 
etc. 

 

12.1.1 Outline of sub functions 

The following table shows the types of sub functions available.  

 

Sub function 

Details 

OPR retry function 

This function retries the OPR with the upper/lower limit switches during 
machine OPR. This allows machine OPR to be carried out even if the axis is 
not returned to before the near-point dog with JOG operation, etc. 

Functions 
characteristic 
to machine 
OPR 

OP shift function 

After returning to the machine OP, this function offsets the position by the 
designated distance from the machine OP position and sets that position as 
the OP address. 

Backlash compensation 
function 

This function compensates the mechanical backlash. Feed pulses equivalent 
to the set backlash amount are output each time the movement direction 
changes. 

Electronic gear function 

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. 

Functions that 
compensate 
control 

Near pass function  1 

This function suppresses the machine vibration when the speed changes 
during continuous path control in the interpolation control. 

Speed limit function 

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. 

Torque limit function  

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. 

Software stroke limit 
function 

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. 

Hardware stroke limit 
function 

This function carries out deceleration stop with the limit switch connected to 
the QD75MH external device connector. 

Functions that 
limit control 

Forced stop function 

This function is stopped the all axes of the servo amplifier when the forced 
stop input signal of the QD75MH external connector is turned ON. 

Speed change function 

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). 

Override function 

This function changes the speed within a percentage of 1 to 300% during 
positioning. This is executed using "

Cd.13

 Positioning operation speed 

override". 

Acceleration/deceleration 
time change function 

This function changes the acceleration/deceleration time during speed 
change. 

Functions that 
change control 
details 

Torque change function 

This function changes the "torque limit value" during control. 

 

  1: The near pass function is validated only when the machine of the standard specification carries out the position control 

with the continuous path control mode. 

It cannot be invalidated with parameters.