
B-63943EN/02 7.SERVO INTERFACE
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Time requirements
Requirements for the signals at the input pins of input connectors
JF101 to JF108. The signals for these connectors are differential
input signals with A and B phases. An important factor is time TD
from point A, when the potential difference between PCA and *PCA
exceeds 0.5V, to point B, when the potential difference between PCB
and *PCB becomes lower than 0.5V. The minimum value of TD is
0.15 µs. The period and pulse width of the signals must be long
enough to satisfy the above requirements.
Input voltage requirements
The voltage of the A and B phase signals must meet the following
requirements:
High level: 2.4 V or more
Low level: 0.8 V or less
Receiver circuit
-phase
signal
PCA
*PCA
110
560
5V
The same circuit is used for B-phase
signals (PCB and *PCB)
Rotation directions of a servo motor and separate rotary encoder
If a separate rotary encoder rotates in a direction opposite to the
direction of servo motor rotation when the servo motor is rotating, the
connection of the feedback cable from the separate rotary encoder
must be changed as follows:
(1) Exchange signal PCA with signal PCB.
(2) Exchange signal *PCA with signal *PCB.