pibot_cnc_laser_series:v577_carrier:connect_limit_switches:start
4.1 Connect Limit Switches
Dry-contact switches, 5 V sensors, and industrial 12-24 V sensors
Power off before wiring. Every input header is Signal / GND / SW-VCC. Never put an external voltage directly on the Signal pin. Set the item 5 SW-VCC jumper before connecting powered sensors.
Input Map in the Test YAML
| Terminal | Assigned function | Terminal | Assigned function |
|---|---|---|---|
| GPIO.42 | X limit - | GPIO.41 | X limit + |
| GPIO.40 | Y limit - | GPIO.39 | Y limit + |
| GPIO.38/48 | Z limit - | GPIO.37 | A limit - |
| GPIO.36 | B limit - | GPIO.10 | C limit - |
| GPIO.47 | Probe | GPIO.3 | Toolsetter |
A. Standard Mechanical Switch
- Leave SW-VCC at the default 5 V.
- Connect the switch between Signal and GND; SW-VCC is not needed for a dry contact.
- Use the normally-closed contact where practical so a broken wire can be detected.
- Set the YAML pin polarity (
:lowor no modifier) to match the chosen contact, then verify with$limits.
B. Three-wire 5 V Sensor
Set SW-VCC to 5 V. Connect sensor VCC to SW-VCC, sensor GND to GND, and sensor output to Signal. Confirm the output is compatible with a 5 V input before power-on.
C. Three-wire 12-24 V Sensor
Set SW-VCC to Vmot-Main, and power the board from the same 12-24 V required by the sensor. Connect VCC / GND / output to the matching three pins. VIN Main and SW-VCC must never exceed 24 V.
PNP and NPN sensors produce opposite active states. Change the YAML pin inversion only after checking the idle and triggered state in $limits.
D. Mixed Sensor Voltages
SW-VCC is one global selection for all ten input headers. It cannot provide 5 V on one header and 24 V on another at the same time. For a mixed system, power the second sensor group from a separate suitable supply, join signal ground only where the equipment design permits, and leave those sensors' SW-VCC pins unconnected. If unsure, use isolated interface modules.
Acceptance check: each input is inactive at rest, changes state only when its switch is operated, and returns cleanly when released. Complete the bench test in section 2.5 before connecting the machine.
pibot_cnc_laser_series/v577_carrier/connect_limit_switches/start.txt · Last modified: by 127.0.0.1