Rockwell Automation 1746-HSRV SLC Servo Control Module User Manual - Manual (Page 58)

Publication 1746-6.1.2 - July 2000
Wiring the SLC Servo Module 5-15
To operate the encoder, wire the encoder so that marker Z is true at
the same time that A and B channels are true. To wire the encoder for
consistent homing of the axis, do the following:
1. Obtain the encoder output timing diagram from the vendor’s
data sheets. A typical example is shown in Figure 5.12.
2. On the timing diagram, look at marker Z and its complement,
marker Z.
3. Determine which signal is low for most of the encoder
revolution and pulses high for the marker interval.
4. Wire the signal that was determined in Step 3 to CH Z.HI on the
termination panel.
5. Wire the other to CH Z.LO on the termination panel.
6. Look at channel B and its complement, channel B.
7. Wire CH B.HI on the termination panel to the signal that is high
for at least part of the marker interval. Depending on the
encoder manufacturer, it is possible that both channels meet this
requirement. If so, use either one.
8. Wire the complementary remaining phase to CH B.LO on the
termination panel.
9. Look at channel A and its complement channel A.
10. Wire the signal that is low for most of the encoder revolution
and pulses high for the marker interval to CH A.HI on the
termination panel.
11. Wire the complementary signal to CH A.LO on the termination
panel.
Typical Vendor Encoder Wiring
See your vendor’s encoder literature for the applicable timing
diagram.