110 
5.9 Full closed-loop input 
The full closed-loop system is a system which is installed on the moving machine by the external 
position detection device (such as encoder, grating ruler, etc.) to detect the position of the control object 
and  feedback the  machine position  information to  the servo  unit  in real time.  The full  closed-loop 
control mode can ensure that the external machinery has no deviation and improve the control accuracy. 
At present, the full closed-loop function supports all control modes. 
Electronic 
gear ratio
Position 
loop 
controller
Speed loop 
controller
Position 
command
Speed command
Current 
loop 
controller
Motor
machine
Motor 
encoder
External 
encoder
+
P9-01.0
Speed 
calculation
-
+
-
Mechanical side 
external grating 
scale frequency 
division
compare
P9-04-P9-07
Excessive 
deviation alarm
P9-02
 
When the full closed-loop is opened, the external grating ruler position feedback is used; when the 
full closed-loop speed feedback is opened, the external grating ruler speed feedback is used. When the 
full closed-loop mode is on, the control mode can be switched (P0-01 and P0-02). 
5.9.1 Full closed-loop input specification 
DS5F  series  servo  hardware  version  3131  (not  included)  and  later  supports  the  function  of  full 
closed-loop input. 
Full closed loop input 
phase A 
Full closed loop input 
phase B 
Full closed loop input 
phase Z 
Grating scale signal 
ground