Fx3U-20Ssc-H Positioning; Overview Of Control - Mitsubishi Electric Melsec FX Series Beginners Manual

FX3U-20SSC-H positioning

4.6 FX
3U
The FX
3U(C)
advanced module to perform positioning operations on two axes using Mitsubishi's fiber optic com-
munication servo network known as SSCNET III (Servo System Controller Network).
Important references for understanding positioning with the FX
● FX
3U
● FX Configurator-FP Operation Manual – (JY997D21801)
It is assumed that you will have read the above manuals or that you will have them nearby for refer-
ence.
4.6.1

Overview of control

Using an FX
fier systems, high speed positioning with pulse output frequencies up to 50,000,000 pulses/second
(50 MHz) is possible on two axes. However, since motors compatible with the MR-J3-B servo amplifier
system have a maximum rated speed of 6,000 RPM, the maximum controllable speed from the
20SSC-H becomes:
rev
6,000
min
The FX
3U
FX -20SSC-H
3U
Feature
Bidirectional
communication
Wiring
Software
Tab. 4-37: Features and advantages of FX
With the use of a built-in Flash ROM, the FX
storage. Since the flash memory transfers all of its data to the buffer memory of the 20SSC-H each time
the power is turned ON, the flash memory provides extra benefit for applications requiring a default
set of data to be automatically loaded. This eliminates the need to use a PLC program for setting
parameters and table data, which can greatly simplify the length and complexity of a ladder program.
The FX
3U
switches such as the START, DOG, and interrupt switches. These inputs assist in controlling position-
ing operations and are necessary to operate instructions such as the interrupt 1-speed constant quan-
tity feed instruction and the DOG type mechanical zero return command.
FX Positioning Control Systems
-20SSC-H positioning
PLC supports connection with the FX
-20SSC-H User's Manual – (JY997D21301)
PLC with the FX -20SSC-H (20SSC-H) module and two Mitsubishi MR-J3-B servo ampli-
3U 3U
PLS 1
262,144
rev 60
-20SSC-H provides several advantages compared to other controllers in the FX family:
Advantage
With SSCNET III, the PLC can communicate with the servo amplifier to monitor torque, servo status
flags, servo parameters and absolute position data.
Easy to use wiring.
High immunity to noise from external devices.
Long distance wiring (50m).
Easy setup of parameters and table data (up to 300 table operations per axis).
Convenient use of monitoring and testing functions.
-20SSC-H includes an input connector to connect manual pulse generator dials and various
Learning to Use the FX Family for Positioning Control
-20SSC-H special function block, which is an
3U
PLS
= 26,214,400
sec
-20SSC-H
3U
-20SSC-H can store data permanently via non-volatile
3U
-20SSC-H include:
3U
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