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Count Method2 - Mitsubishi Electric RD77MS2 User Manual

Melsec iq-r simple motion module.
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Count method2

The following shows an operation outline of the home position return method "count method 2".
The "count method 2" method is effective when a "zero signal" cannot be received. (Note that compared to the "count method
1" method, using this method will result in more deviation in the stop position during machine home position return.)
Operation chart
Machine home position return start
(Positioning start signal)
Home position return request flag
([Md.31] Status: b3)
Home position return complete flag
([Md.31] Status: b4)
[Md.26] Axis operation status
[Md.34] Movement amount
Inconsistent
after near-point dog ON
[Md.20] Current feed value
Inconsistent
[Md.21] Machine feed value
1.
The machine home position return is started.
(The machine begins the acceleration designated in "[Pr.51] Home position return acceleration time selection", in the direction
designated in "[Pr.44] Home position return direction". It then moves at the "[Pr.46] Home position return speed" when the
acceleration is completed.)
2.
The machine begins decelerating when the near-point dog ON is detected.
3.
The machine decelerates to the "[Pr.47] Creep speed", and subsequently moves at that speed.
4.
The command from the Simple Motion module will stop and the machine home position return will be completed when
the machine moves the movement amount set in "[Pr.50] Setting for the movement amount after near-point dog ON"
from the near-point dog ON position.
Restrictions
When this method is used, a deviation will occur in the stop position (home position) compared to other home position return
methods because an error occurs in taking in the near-point dog ON. The error varies by the input type of "[Pr.118] DOG
signal selection".
The taking error by the input type is shown below.
10 [s] when setting "0: Simple Motion module"
The operation cycle when setting "1: Servo amplifier"
The operation cycle + scan time when setting "2: Buffer memory"
V
[Pr.46] Home position
return speed
Near-point dog
OFF
ON
OFF
ON
OFF
OFF
Standby Home position return
0
Value of the machine moved is stored
[Pr.50] Setting for the movement amount
after near-point dog ON
[Pr.47] Creep speed
t
[Md.34] Movement amount after near-point dog ON
Leave sufficient distance from
the home position to the near-point
ON
dog OFF.
ON
Standby
Value of *1
Home position address
2 HOME POSITION RETURN CONTROL
2.2 Machine Home Position Return
2
*1
39

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