Delta ASDA-A2 Series User Manual page 339

Chapter 8 Servo Parameters
C: Input polarity
Pulse
Logic
Type
AB
phase
pulse
Positive
0
Logic
CW +
CCW
pulse
Pulse
Logic
Type
Positive
0
Pulse +
Logic
Direction
Pulse
Logic
Type
Positive
0
Pulse +
Logic
Direction
In digital electronics, logic circuits are generally divided into two classes according to their
polarity - positive logic and negative logic. With reference to positive logic, logical 1 state
represents the high voltage level and logic 0 represents the low voltage level. With reference to
negative logic, logical 1 state represents the low voltage level and logic 0 state represents the
high voltage level.
Positive Logic Circuit
8-62
High-speed pulse and Low-speed pulse
Forward
Pulse Phase-Lead
(38)
Pulse
(29)
T2 T2 T2 T2 T2
(46)
Sign
(40)
High-speed pulse
Forward
Sign is high
Low-speed pulse
Forward
Sign is high
(43)
Pulse
(41)
T4 T5 T6 T5 T6
(36)
Sign
(37)
TH
T2 T3
TH
T5 T4
Negative Logic Circuit
ASDA-
Reverse
Pulse Phase-Lag
T2 T2 T2 T2 T2 T2
Reverse
Sign is low
Reverse
Sign is low
Revision September 2012
A2
TH