Rockwell Automation 8520 9/Series Hardware TAB 5 - Manual (Page 108)

Section 5B
9/440HR CNC/Drive System
5B-34
Wiring a Probe for Falling Edge Configuration
Figure 5B.23 shows a typical wiring diagram compatible with most probe
designs configured to trigger on the falling edge of the probe signal.
Figure 5B.23
Typical Wiring of a Touch Probe Configured for Falling Edge Trigger
11309-I
3
2
1
9/440HR Wiring Board
470 ohm
5V common
1000 ohm
+5 V dc
4
Probe Contact
to encoder interface