Speed Positioning - Drvi/Drva Instruction; Incremental Method And Absolute Method - Mitsubishi MELSEC-F FX3U Series User Manual

FX /FX Series PLC User's Manual - Positioning Control Edition
3U 3UC
Built-in Positioning Function
8.

1-Speed Positioning - DRVI/DRVA Instruction

The Built-in positioning function uses the drive to increment (DRVI) instruction or the drive to absolute (DRVA)
instruction to perform 1-speed positioning. Note that these two instructions use different target position
setting methods.
Instruction
Drive to Increment (DRVI) instruction
Drive to Absolute (DRVA) instrument
→ For the important items common to all the positioning instructions, refer to Section 4.7.
8.1

Incremental Method and Absolute Method

There are two target position setting methods for positioning operation as described below:
1. Incremental method (relative address setting method)
While regarding the current position as the start point, specify the transfer direction and the transfer distance
(relative address) to determine the target position.
For example:
To Ueno
To go from Odawara (current position) to Atami (target position), set the distance (+20.7 km)
from Odawara to Atami.
B - 96
Incremental method:
Uses a relative address to specify the target position.
Absolute method:
Uses an absolute address to specify the target position.
Transfer
distance:
+100
Transfer distance: +100
Transfer distance: -150
Transfer distance: -100
0 100
Origin Point A
-20.7km
Tokyo Shinyokohama
8 1-Speed Positioning - DRVI/DRVA Instruction
Target position setting method
→ For example programs, refer to Chapter 12.
Transfer distance:
-100
Transfer distance: +100
Transfer distance: +50
150 300
Point B Point C
+20.7km
Relative address
Current position Target position
Odawara Atami
8.1 Incremental Method and Absolute Method
Start point
End point
Mishima Shizuoka