Mitsubishi A1SD75M3 User Manual page 538

12 CONTROL AUXILIARY FUNCTIONS
[2] Control details
PLC READY signal [Y1D]
AD75 READY signal [X0]
Pr.59 Absolute position
restoration selection
Machine zero point return start
(Positioning start signal) [Y10,Y11,Y12]
Zero point return request flag
Md.40 Status: b3
Zero point return complete flag
Md.40 Status: b4
Md.35 Axis operation status
Absolute position restoration
Md.121
mode
The operation performed for absolute position restoration mode switching is described
below.
1) To switch the absolute position restoration mode, select the mode in
" Pr.59
zero point return.
The absolute position restoration mode is established when the zero
point return complete flag (
2) When power is switched from OFF to ON after execution of Step 1),
the system starts up in the mode established in Step 1) and restores
the absolute position.
The established absolute position restoration mode can be checked in the "
Absolute position restoration mode".
When the " Md.121 Absolute position restoration mode" is "1: Infinite length mode", the
AD75 automatically updates the absolute position of the zero point stored in the
FeRAM every time the machine moves the given distance* (servomotor shaft: 8142 to
8192 revolutions). This detects the absolute position for infinite length positioning
control. Every time the absolute position is automatically updated, the "
access count" is incremented by "2".
* The given distance is automatically determined by the setting of "
pulses per rotation".
OFF
ON
Standard mode
Fig. 12.34 Absolute position restoration mode switching operation
Absolute position restoration selection" and make a machine
Md.40
ON
OFF
Infinite length mode
ON
OFF
ON
OFF
OFF
Standing by In zero point return
Standard mode
12 - 66
MELSEC-A
Status: b4) turns ON.
Md.120
Pr.2
ON
Standing by
Infinite length mode
Md.121
FeRAM
No. of