Program Examples - Mitsubishi Electric Melsec FX Series Beginners Manual

MELSEC FX PLC positioning
4.1.3

Program Examples

Two positioning examples are included as a reference to get started with PLC programming.
Hybrid programming example for FX
The first example below illustrates zero return and absolute positioning control on 1 axis. Since the
special devices for utilizing positioning instructions are different depending on the PLC, please note
that the following program is a hybrid program and that device addresses must be changed accord-
ing to the type of PLC.
NOTE A general understanding of step ladder and ladder logic is necessary to use the program.
Forward
positioning
Output pulse frequency:
100,000 Hz
100
Origin after
zero return
Reverse
positioning
Acceleration/deceleration time:
Fig. 4-2: Configuration for the program example
See marker
See marker
See marker
X000
X001
X002
X003
X004
X005
X006
Tab. 4-5: Used inputs and outputs
FX Positioning Control Systems
500,000
Bias speed
500 Hz
500 Hz
100 ms
in program fig. 4-5 (3).
in program fig. 4-5 (3).
in program fig. 4-6 (4).
Inputs
Immediate stop
Zero return command
Forward rotation positioning command
Reverse rotation positioning command
Stop command
Near-point signal (DOG)
Servo ready
Learning to Use the FX Family for Positioning Control
, FX , FX , FX FX
1S 1N 3G 3GC,
Reverse rotation limit 2
(Servo amplifier side)
Servo motor
Reverse
rotation
Y000
Y002
Y004
Y010
—
—
—
FX and FX PLCs
3GE, 3S 3U(C)
Forward rotation limit 2
(Servo amplifier side)
Forward
rotation
Outputs
Pulse train output
CLEAR signal
Rotation direction signal
CLEAR signal
—
—
—
413010da.eps
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