MELSEC FX PLC positioning Learning to Use the FX Family for Positioning Control
FX Positioning Control Systems 4 - 1
4 Learning to Use the FX Family for Position-
ing Control
4.1 MELSEC FX PLC positioning
The FX
1S
, FX
1N
, FX
3G
, FX
3GC
, FX
3GE
, FX
3S
, and FX
3U(C)
Series PLC main units include basic positioning
instructions to send command pulses to a stepper motor or servo amplifier. While FX PLCs support
point-to-point positioning, full control is also available for reading the absolute position from a servo
amplifier, performing zero return, and altering the workpiece speed during operation.
Important references for understanding positioning with FX PLCs include:
● Programming Manuals for the MELSEC FX Series
● User’s Manuals – Hardware Edition – for the various controllers
of the MELSEC FX family
● FX
3S
/FX
3G
/FX
3GC
/FX
3U
/FX3
UC
Series User’s Manual – Positioning Control Edition
–
(JY997D16801)
● FX
2N
-1PG User’s Manual
– (JY992D65301)
● FX
2N
-10PG User’s Manual
– (JY992D93401)
● FX
2N
-10GM/FX
2N
-10GM User’s Manual
– (JY992D77801)
It is assumed that you will have read and understood the above manuals or that you will have them
close at hand for reference.
4.1.1 Overview of control
Number of Axes
The FX
1S
, FX
1N
, FX
3GC
and FX
3S
transistor type PLCs support positioning on 2 axes with operation
speeds up to 100,000 pulses/second (100 kHz).
The main units FX
3G
-14MT/, FX
3G
-24MT/, and FX
3GE
-24MT/ (transistor outputs) can control up
to two axes and the main units FX
3G
-40MT/, FX
3G
-60MT/, and FX
3GE
-40MT/ can control a max-
imum of three axes with up to 100 kHz.
The FX
3U(C)
transistor type PLC main units support positioning speeds up to 100 kHz on 3 axes. If two
FX
3U
-2HSY-ADP adapters are connected to the FX
3U
, 4 axes are available with operation speeds up to
200 kHz.
The PLS/DIR pulse output method is used for all PLC main units to output pulses as shown in the fol-
lowing table.
Output terminals for direction can be specified arbitrarily when the FX
3U
-2HSY-ADP is not used.
Y4, Y5, Y6 and Y7 are used as an example.
The FP/RP pulse output method is also available with the FX
3U
-2HSY-ADP.
Connection of the FX
3U
-2HSY-ADP is only possible to a FX
3U
base unit.
1
st
Axis 2
nd
Axis 3
rd
Axis 4
th
Axis
Applicable Model
FX
1S
, FX
1N,
FX
3G
-14MT/
,
FX
3G
-24MT/,
FX
3GC,
FX
3GE
-24MT/,
FX
3S
——
FX
3GE
-40MT/, FX
3U(C)
, FX
3G
-40MT/
,
FX
3G
-60MT/ —
FX
3U
+ (2) FX
3U
-2HSY-ADP
Pulse Output
Y0 Y1 Y2 Y3
Direction Output
Y4 Y5 Y6 Y7
Tab. 4-1:
Overview of applicable PLC main units
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