Chapter 1 Product Outline; Positioning Control; Features Of Ld75 - Mitsubishi Electric MELSEC-L LD75P User Manual

CHAPTER 1
1.1

Positioning Control

1.1.1

Features of LD75

The LD75 has the following features.
(1) Selection of modules
The pulse output types of the available modules are either the open collector output system or the differential
driver output system. A module can be selected from the following depending on the drive unit type and the
number of axes.
• Open collector output system: LD75P1/LD75P2/LD75P4
• Differential driver output system: LD75D1/LD75D2/LD75D4
(2) High-speed start time
High-speed start time (1.5ms for 1-axis linear control) during positioning control is achieved.
(3) High-speed pulse output
The modules with a differential driver (LD75D) incorporate the improvements in pulse output speed and
maximum distance to the drive unit.
• LD75D: 4Mpulse/s, 10m max.
(4) Wide variety of positioning control functions
The main functions (such as OPR control, positioning control, and manual control) which are required for any
positioning system and the sub functions which limit and add functions to those controls are supported.
(a) Enhanced OPR control
• Additional features of OPR control
Six machine OPR methods are provided: one near-point dog method, three stopper methods, and two
count methods. Select an applicable method according to the system.
• OPR retry function
The OPR retry function is provided so that the machine OPR control can be performed from any position,
regardless of the machine stop position when the system is powered on.
(b) Wide variety of control methods
Twenty kinds of positioning controls, such as position control, speed control, speed-position switching control,
position-speed switching control, and other controls, are provided.
• Independent control of each axis
Controls, such as position control and speed control, can be performed independently for each axis at
any given timing.
• Interpolation control
Interpolation controls using multiple axes can be performed. (2- to 4-axis linear control, 2-axis circular
interpolation control, 2- to 4-axis speed control, 3-axis helical interpolation control)
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PRODUCT OUTLINE