14 - 48
14. ABSOLUTE POSITION DETECTION SYSTEM
(2) Sequence program example
(a) Conditions
1) When the servo-on signal and power supply GND are shorted, the ABS data is transmitted at power-
on of the servo amplifier or on the leading edge of the RUN signal after a PC reset operation (PC-
RESET). The ABS data is also transmitted when an alarm is reset or when an emergency stop is
reset.
2) An ABS checksum error is caused (Y3AON) if checksum inconsistency is found in transferred data.
3) The following time periods are measured. If the ON/OFF state does not change within the specified
time, the ABS communication error occurs change within the specified time, the ABS communication
error occurs (Y3A ON):
ON period of ABS transfer mode (Y31)
ON period of ABS request (Y32)
OFF period of reading to send ABS data (X22)
(b) Device list
X input contact
Y output contact
X20
ABS transmission data bit 0/Positioning completion Y30
Servo-on
X21 ABS
transmission data bit 1/zero speed
Y31 ABS
transfer mode
X22 ABS
transmission data ready/Torque limiting
Y32 ABS
request
X23
Servo alarm
Y33
Alarm reset
X24 Alarm
reset
X34
(Note 2)
Electromagnetic brake output
X25
Servo emergency stop
Y35
(Note 1)
Clear
X26 Servo-on
Y38 Servo
alarm
X27
Home position return start
Y39
ABS communication error
X28
Operation mode I
Y3A ABS
checksum
error
X29
Operation mode II
D register
M contact
D0
Number of retries
M0
End of error reset
D9
Home position address: Lower 16 bits
M10
Preparation completion
D10
Home position address: Upper 16 bits
M11
Servo-on request
D100 to D104 For special absolute value restoration instruction M12
Absolute position restoration command
T timer
M13
Absolute value restoration memory
T0
Retry wait timer
M14
Error flag output
T10
(Note 1)
Clear (CR) ON timer
M15
Sum check NG
M16
Retry
flag
M17
Retry flag reset request
M20
(Note 1)
Clear (CR) ON timer request
M21
(Note 1)
Data set type home position return request
M100 to M101 For special absolute value restoration instruction
C counter
C0
Retry
counter
Note 1. Required for data set type home position return.
2. Required for electromagnetic brake output.
Summary of Contents for MELSERVO MR-J3 A Series
Page 15: ...A 14 MEMO ...
Page 225: ...7 12 7 GENERAL GAIN ADJUSTMENT MEMO ...
Page 241: ...8 16 8 SPECIAL ADJUSTMENT FUNCTIONS MEMO ...
Page 251: ...9 10 9 TROUBLESHOOTING MEMO ...
Page 263: ...10 12 10 OUTLINE DRAWINGS MEMO ...