Specifications

5– 3
5
5.ABSOLUTE POSITION DETECTION SYSTEM
Configuration
Note: 1. The A0J2CPU cannot be used.
2. For the availability of the units not listed above, consult Mitsubishi.
3. The absolute position detection program is not required for the FX-1GM,
FX(E)-20GM and FX-10GM.
2) Applicable general-purpose programmable controller units
General-purpose
programmable controller
Servo amplifier
Servo motor
Battery
CN1A
CN1B CN2
AD75
or the like
I/O
(4) Overview of absolute position detection data communication
1) System block diagram
As shown below, the encoder consists of not only the position controlling A, B and Z phase
signals but also a counter designed to detect a position within one revolution and a cumulative
revolution counter designed to detect the number of revolutions.
Whether the general-purpose programmable controller power is on or off, the absolute position
detection system keeps the absolute position of the machine detected and battery-backed.
Therefore, once the home position has been set during machine installation, dog type zeroing
is not needed thereafter at power-on, ensuring ease of recovery after a power failure or
fault.
Also, battery-backed by the super capacitor in the encoder, absolute position data can be
held if cable disconnection or cable breakage occurs within the specified time (data holding
time during battery replacement).
General-purpose programmable controller Servo amplifier
EEPROM memory
LSO
1XO
CPU
Positioning unit
I/O unit
Current position
Input
Output
Current
position
read
Pulse train
command
Zeroing data
Backup at
power off
Current
position
LS
Speed
detection
1X
Detection of
position within
one revolution
Speed control
Position control
1P/rev Cumulative revolution
counter
Within one-revolution counter
A, B, Z phase signals
Super capacitor
Servo motor
MR–BAT Battery
High-speed serial
(Encoder)
Positioning Unit
AD71 · AD71S2 · AD71S7
A1SD71S2 · A1SD71S7
AD75P · A1SD75P
I/O Unit
AX40 · 41 · 42
AY40 · 41 · 42
FX–1PG · FX–1GM
FX(E)–20GM · FX–10GM
FX2–32MT