Mitsubishi Electric MELSEC-A/QnA Series Handbook page 262

7
POSITIONING MODULE REPLACEMENT
(2) Changed function from AD75M1/AD75M2/AD75M3
In case of using the following functions with AD75M, make sure that there is no operation problems
when converted to QD75M.
Changed functions
Software stroke limit function
Current value changing M code
function
Acceleration/deceleration speed
control
Stop process and restart after stop
positioning operation stop
READY signal (X0)
Manual pulse generator operation
Axis operation status
Continuous path control
Near pass
2-axis interpolation
• 2-axis linear interpolation
• 2-axis fixed-feed
• Circular interpolation
Step function
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1. The software stroke limit check of arc address is carried out only when a sub point is designated.
It is not carried out when a center point is designated.
2. The software stroke limit check during speed control is carried out in the following cases:
• When the software stroke limit is applied to the current feed value with
value is updated with
Pr.21
• When the software stroke limit is applied to the machine feed value
3. If an attempt is made to change the current value but the designated address is out of the
software stroke limit range, the attempt is considered as an error and the current value is not
changed.
4. Error code change
AD75M:
There are 3 types of errors for each upper and lower stroke limit. (error code 509 to 512)
QD75M:
Errors for the software stroke upper limit are integrated in to error code 507.
Errors for the lower limit are integrated in to error code 508.
Error codes 509 to 512 are deleted.
1. An error occurs when the designated new current value is out of the software stroke limit range.
2. The M code setting value is valid during the positioning data current value changing instruction.
Only two-word type (1 to 8388608ms) can be used as the setting value for the acceleration/
deceleration time.
1. "Peripheral side (emergency) stop" is deleted from the stop causes of Stop group 2 "sudden stop
selection".
"Test mode fault" in the stop causes of Stop group 3 "sudden stop selection" is changed to be in
the stop causes of Stop group 2 "sudden stop selection".
2. "Stop (QD75 peripheral)" is added to the stop causes of Stop group 3 "sudden stop selection".
3. Error code 100 (Peripheral device stop during operation) is deleted.
4. "Programmable controller CPU error occurrence" is added to the stop causes of Stop group 2
"Sudden stop selection".
OFF
ON
The No. of connectable manual pulse generator is changed from 1generator/1axis to 1generator/1
module.
"Step stopped" is changed to "Stopped" and "Step error occurring" is changed to "Error occurring".
• AD75M:
If the reference axis operates in reverse direction, the control is internally changed into the
continuous positioning control. (restart after deceleration stop)
• QD75M:
Even if the reference axis operates in reverse direction with interpolation, the control remains as
the continuous path control.
(In single-axis operation, the operation is the same as that of the AD75M.)
For the continuous path control, only the near pass function is available.
Positioning address pass is not conducted.
The interpolation target axis can be randomly set with a positioning identifier.
1. "Step stopped" is changed to "Stopped" and "Step error occurring" is changed to "Error occurring"
in the axis operations status parameters.
2. The restart command for step start information (02H) is deleted.
3. The step operation is restarted with the restart command.
Change description
AD75M
Normal (READY)
Not READY/WDT error
and the current feed
Pr.14
QD75M
Not READY/WDT error
Normal (READY)