Typical Encoder Timing Diagram - Allen-Bradley 1746-HSTP1 User Manual

Typical Encoder Timing
Diagram
Figure 2.6 Encoder input equivalent circuit
HI
210
LO
210
A typical encoder timing diagram is shown below. For actual
connections, consult your encoder manufacturer's timing diagram. For
all encoder types, if the direction (phasing) of the feedback is
backwards, correct this condition by reversing the channel A and
channel B connections.
1 Cycle
90'
Channel A
B
Z
Optional
A
B
Z
Wire CH B, CH A, and CH Z to CH B LO, CH A LO, and CH Z LO,
respectively on the terminal block.
STEP 3
Channel A is high at least part
of marker interval. Connect to
CH A. HI" of termination point
CCW rotation viewing shaft
Publication 999-121 - December 1999
2-7
Installation and Wiring
Hi
Lo
STEP 1
High marker interval.
Connect to + encoder
marker.
STEP 2
B is high for at least
part of marker interval.
Connect to CH B. HI"