12 - 15
MELSEC-Q
12 CONTROL SUB FUNCTIONS
Calculation example
(Conditions)
Movement amount per pulse
No. of pulses per rotation
Unit magnification
: 500 (µm/rev)
: 12000 (pulse/rev)
: 1
(Positioning results)
Command movement amount
Actual movement amount : 100mm
: 101mm
(Compensation amount)
AL' 5
×
103101
×
1035050 101
AP' =12000
×
101
×
103=12000 =240
Movement amount per pulse
No. of pulses per rotation
Unit magnification
: 101 (µm/rev)
: 240 (pulse/rev)
: 1
[Set in Pr.3 ]
[Set in Pr.2 ]
[Set in Pr.4 ]
(e) Set the post-compensation " Pr.2 No. of pulses per r otation (Ap')","Pr.3 Movement amount per rotation (Al')", and " Pr.4 Unitmagnification (Am')" in the parameters, and write them to the QD75.The set details are validated at the rising edg e (OFF ON) of thePLC READY signal (Y0).
Setting item Setting
value Setting details Pre-compensation
value
Pr.2 No. of pulses per
rotation Ap' Set the post-compensation value. Ap
Pr.3 Movement amount
per rotation Al' Set the post-compensation value. Al
Pr.4 Unit magnification Am ' Set the post-compensation value. Am
Refer to Section 5.2 "List of parameters" for setting details.