Omron OMNUC G5 R88M-K series User Manual page 223

Supportive Scales
The corresponding scale for each output type is as follows.
Pn323
set External encoder type
value
90 phase difference
0 output type
Serial communication type
1 (Incremental encoder
specifications)
Serial communication type
(Absolute encoder
2
specifications)
*1. These are the feedback speeds from the external encoder at which Servo Drive can respond.
Check the external encoder operation manual for its maximum output frequency.
*2. These are the directions that the Drive counts the pulse of external encoder of 90
output type.
Count-down direction
EXA
EXB
EXB is 90° ahead of EXA.
*3. For the external encoder connection direction, set the rotation direction so that count-up occurs when
the motor shaft is rotating in the CCW direction, and count-down occurs when the motor shaft is
rotating in the CW direction. If the connection direction cannot be selected due to installation
conditions, etc., the count direction can be reversed using External Feedback Pulse Direction
Switching (Pn326).
Precautions for Correct Use
 Take note that if Pn000 = 1, the encoder count direction becomes opposite to the count direction
used for monitoring the total external encoder feedback pulses, etc.
If Pn000 = 0, the count direction matches the count direction for monitoring.
 Even when the drive speed is within the specified range, an acceleration error occurs if the motor
shaft rotation speed exceeds the maximum speed.
 To check the installation direction, use the front panel monitor or the monitoring function of CX-
Drive and check the count directions of the external encoder total feedback pulses and the
encoder total feedback pulses. If they match, the connection is set up correctly.
OMNUC G5-Series AC Servo Drives Users Manual (Built-in MECHATROLINK-II communications type)
Corresponding scale examples
External encoder of phase-AB output type
*2*3
Sony Manufacturing Systems Corporation
SR75, SR85
*3
Mitutoyo Corporation
AT573, ST771A, ST773A
*3
Sony Manufacturing Systems Corporation
SR77, SR87
t1
t2
t1>0.25 μs
t2>1.0 μs
5-4 Full Closing Control
Count-up direction
t1
EXA
EXB
t2
EXB is 90° behind EXA.
t1>0.25 μs
t2>1.0 μs
Maximum input
1
frequency *
0 to 4 Mpps
(After quadruple
multiplier)
0 to 400 Mpps
0 to 400 Mpps

phase difference
5
5-12