Speed Positioning - Drvi/Drva Instruction; Incremental Method And Absolute Method - Mitsubishi Electric FX3S Series User Manual

FX /FX /FX
3S 3G 3GC
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.
Drive to Increment (DRVI) instruction
Drive to Absolute (DRVA) instrument
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
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:
Absolute address
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/FX /FX PLC User's Manual - Positioning Control Edition
3U 3UC
Instruction
For important items common to all of the positioning instructions, refer to Section 4.7.
Transfer
distance:
+100
Transfer distance: +100
Transfer distance: -150
Transfer distance: -100
0
Origin
Tokyo Shinyokohama
To go from Odawara (current position) to Atami (target position), set the distance (+20.7 km)
from Odawara to Atami.
Address
100
0
Origin
Origin
To Ueno Tokyo Shinyokohama

0 28.8km
To go from Odawara (current position) to Atami (target position), set the distance (+104.6 km)
from Tokyo (origin) to Atami.
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Target position setting method
Incremental method:
Uses a relative address to specify the target position.
Absolute method:
Uses an absolute address to specify the target position.
 For example programs, refer to Chapter 12.
Transfer distance:
-100
Transfer distance: +100
Transfer distance: +50
100 150
Point A Point B
-20.7km +20.7km
Current position Target position
Odawara Atami
Address
100
Address
150
Address
300
Address 150
Address 100
Address 150
100 150
Point A Point B
Current position Target position
Odawara
 
83.9km
8 1-Speed Positioning - DRVI/DRVA Instruction
8.1 Incremental Method and Absolute Method
Start point
End point
300
Point C
Relative address
Mishima Shizuoka
Start point
End point
300
Point C
Atami Mishima Shizuoka
 
104.6km 120.7km 180.2km
A
B
Apx.
B - 121