Mitsubishi Electric FX3S Series User Manual page 163

FX /FX /FX
3S 3G 3GC
Built-in Positioning Functions
- When using the FX
out ABS data into the current value register of the FX
instruction.
When using the FX
write the read-out ABS data into the current value register (value converted into pulse) of the FX
or FX
(U\G) for
1. Detection of absolute position
1) If the DABS (FNC155) instruction turns ON, the
PLC will activate the servo-ON output and the
ABS transfer mode output.
2) 32+6-bit data communication will be performed
while mutually checking the data sending/
receiving condition using the "send data ready"
signal and the "ABS data request" signal.
3) The 2-bit line (line for ABS bit 0 and bit 1) will be
used for data transmission.
4) At the completion of ABS data reading, the
"Instruction execution complete" flag (M8029)
will turn on.
 For details on the "Instruction execution
7.4 Initial Zero Return
When your system is established, even if your servo motor is equipped with an absolute position detection
function, it is necessary to perform zero return at least once to send the CLEAR signal to the servo motor.
Use one of the following methods for the initial zero return:
1) Execute DSZR (FNC150) with DOG search zero return instruction or ZRN (FNC156) zero return
instruction using the CLEAR signal function to complete zero return.
2) Carry out zero return for the machine using the position adjustment method in the jogging operation mode
or manual operation mode, and then input the CLEAR signal.
To input the CLEAR signal, use the output of the PLC or the external switch shown in the following figure.
CLEAR
signal
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/FX /FX PLC User's Manual - Positioning Control Edition
3U 3UC
-1PG(-E), read out the ABS data to the data register first, and then write the read-
2N
-1PG or FX
3U
-10PG using instructions such as the DTO instruction or directly specify the buffer memory
2N
D to be written to.
2
complete" flag, refer to
Example for MR-J2A
CR 8
SG 10
search engine
2N
-10PG, either read out the ABS data to the data register first and
2N
Example for MR-J3
Servo-ON
ABS data transfer
mode
"Send data ready"
signal
"ABS data request"
signal
ABS(bit1)
ABS(bit0)
Subsection 4.7.4.
7 Absolute Position Detection System (Absolute Current Value Read) - ABS Instruction
-1PG(-E) using instructions such as the DTO
□
A
SON
ABSM
ABST
ABSR
ABS B1
ABS B0
Current position data (32 bits)
+ check data (6 bits)
7.4 Initial Zero Return
A
-1PG
3U
B
Apx.
Amplifier output
PLC output
Amplifier output
Amplifier output
B - 119