MITSUBISHI ELECTRIC Mitsubishi Programmable Logic Controller QD75D - Manual (Page 557)

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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.