Mitsubishi Electric MELSEC-L LD75D, User Manual

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CHAPTER 3 SPECIFICATIONS AND FUNCTIONS
3
3.
2
List
of
F
unct
ions
3.2
List of Functions
3.2.1
LD75 control functions
The LD75 has several functions. In this manual, the LD75 functions are categorized and explained as follows.
(1) Main functions
(a) OPR control
"OPR control" is a function that established the start point for carrying out positioning control, and carries out
positioning toward that start point. This is used to return a workpiece, located at a position other than the OP
when the power is turned ON or after positioning stop, to the OP. The "OPR control" is preregistered in the
LD75 as the "Positioning start data No. 9001 (Machine OPR)", and "Positioning start data No. 9002 (Fast
OPR). (

Page 316, CHAPTER 8)
(b) Major positioning control
This control is carried out using the "Positioning data" stored in the LD75. Positioning control, such as position
control and speed control, is executed by setting the required items in this "positioning data" and starting that
positioning data. An "operation pattern" can be set in this "positioning data", and with this whether to carry out
control with continuous positioning data (ex.: positioning data No. 1, No. 2, No. 3,

) can be set. (

Page
339, CHAPTER 9)
(c) High-level positioning control
This control executes the "positioning data" stored in the LD75 using the "block start data". The following types
of applied positioning control can be carried out.
• Random blocks, handling several continuing positioning data items as "blocks", can be executed in the
designated order.
• "Condition judgment" can be added to position control and speed control.
• The operation of the designated positioning data No. that is set for multiple axes can be started
simultaneously. (Pulses are output simultaneously to multiple servos.)
• The designated positioning data can be executed repeatedly,
etc., (

Page 456, CHAPTER 10)
(d) Manual control
By inputting a signal into the LD75 from an external source, the LD75 will output a random pulse train and carry
out control. Use this manual control to move the workpiece to a random position (JOG operation), and to finely
adjust the positioning (inching operation, manual pulse generator operation), etc. (

Page 479, CHAPTER
11)
(2) Sub functions
When executing the main functions, control compensation, limits and functions can be added. (  Page 507,
CHAPTER 12)