Mitsubishi MELSEC A1S38B - Milling Machine; Positioning Control System Application

APPLICATION EXAMPLESI
IMillina Machine I
I Positionina control svstem amlication I
Items controlled
Milling machine
Overall aim
The addition of a
PLC controlled positioning unit to a general purpose manual
milling machine to allow automatic positioning and the replacement of existing relay
control panel.
Advantages
Sequence control and positioning control are possible without the need for a
specialized positioning system.
Method
of control description
When the
X and Y position data is set using a digital switch on the machines
operation panel and a pattern is specified, the cutting pattern is calculated and the
required positioning is perfomed. Since a three phase motor, and an AC variable
speed drive are used for positioning in this application, smooth deceleration is
achieved and stopping accuracy is obtained.
System configuration
Operation panel
( Digital switches,
Counter
BR
Magnetic scale
I
- - - - - - -
' Y axis(table) I
- 2 axis (head) ,
AC Variable
PLC system requirements
1 x AISCPU
1 xAIS6IP
1 x Ai S38B
I x AiSD61
1 x AI S62DA
nxA1SX-
NxAISY-
(AISDGI
- High speed counter module, see page 23)
(AI S62DA - Analog output module, see page 22)
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