Speed Positioning - Drvi/Drva Instruction; Incremental Method And Absolute Method; Drive To Increment - Drvi Instruction - Mitsubishi Electric Melsec-F FX3GC Series User Manual

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Built-in Positioning Functions
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 important items common to all of the positioning instructions, refer to Section 4.7.
8.1

Incremental Method and Absolute Method

There are two target position setting methods for positioning operations 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 Tokyo
To go from Odawara (current position) to Atami (target position), set the distance (+20.7 km)
from Odawara to Atami.
2. Absolute method (absolute address setting method)
Specify the distance (absolute address) from the origin to the target position. In this case, any position can be
the start point (current position).
For example:
To Ueno
Absolute address
To go from Odawara (current position) to Atami (target position), set the distance (+104.6 km)
from Tokyo (origin) to Atami.
PLC User's Manual - Positioning Control Edition
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
0 100 150
Origin Point A Point B
-20.7km
Current position Target position
Shinyokohama Odawara
Address
100
Address
150
Address 150
0 100
Origin Point A Point B
Current position
Origin
Tokyo Shinyokohama
 
0 28.8km
8 1-Speed Positioning - DRVI/DRVA Instruction
8.1 Incremental Method and Absolute Method
Target position setting method
 For example programs, refer to Chapter 12.
Transfer distance:
-100
Transfer distance: +100
Transfer distance: +50
300
Point C
+20.7km
Relative address
Atami Mishima
Address
100
Address
300
Address 100
Address 150
150 300
Point C
Target position
Odawara Atami
 
83.9km 104.6km
Start point
End point
Shizuoka
Start point
End point
Mishima Shizuoka

120.7km 180.2km
B - 121
A
B
Apx.