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MELSEC-Q

12   CONTROL SUB FUNCTIONS

12.7.6 Command in-position function

The "command in-position function" checks the remaining distance to the stop position

during the automatic deceleration of positioning control, and raises a flag. This flag is

called the "command in-position flag". The command in-position flag is used as a front-

loading signal indicating beforehand the completion of the position control.

The details shown below explain about the "command in-position function".

  [1] Control details

  [2] Precautions during control

  [3] Setting the command in-position function

  [4] Confirming the command in-position flag

[1]   Control details

The following shows control details of the command in-position function.

(1) When the remaining distance to the stop position during the automatic

deceleration of positioning control becomes equal to or less than the value

set in "

Pr.16

 Command in-position width", "1" is stored in the command

in-position flag (

Md.31

Status: b2).

(Command in-position width check)

Remaining distance 

≤

 " Pr.16  Command in-position width" setting value

Command in-position 
width setting value

Positioning

V

t

ON

OFF

Command in-position flag

[ Md.31 Status : b2]

Fig. 12.43 Command in-position operation

(2) A command in-position width check is carried out every 1.8ms.