Initial Zero Return - Mitsubishi FX3G Series User Manual

FX /FX /FX PLC User's Manual - Positioning Control Edition
3G 3U 3UC
Built-in Positioning Functions
- When using the FX
then write the read-out ABS data into the current value register of the FX
using the DTO instruction or directly specify the buffer memory (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
-1PG(-E) or FX
2N 2N
complete" flag, refer to
Subsection 4.7.4.
Example for MR-J2- A
CR 8
SG 10
7 Absolute Position Detection System (Absolute Current Value Read)-ABS
-10PG, read out the ABS data from the data register first, and
Servo-ON
ABS data transfer
mode
"Send data ready"
signal
"ABS data request"
signal
ABS(bit 1)
ABS(bit 0)
7.4 Initial Zero Return
-1PG(-E) or FX -10PG
2N 2N
to be written to.
D
2
SON
ABSM
TLC Amplifier output
ABSR
PLC output
ZSP Amplifier output
DO1 Amplifier output
Current position data (32 bits)
+ check data (6 bits)
B - 107
A
B
Apx.