Digital Inputs
Digital Inputs Overview
Radonix control boards’ digital inputs are labeled I[nn], where nn is a positive integer indicating the input number. These inputs are opto-isolated (≈3 kΩ impedance) for low-noise operation.
Figures 5 & 6 show the internal wiring for NPN (sink/low-active) and PNP (source/high-active) modes, respectively:
Figure 5 – NPN vs. PNP input wiring
Configuration lives under:
Setting → System → InPort[nn]
Each input has three settings:
- Enabled: enable/disable the input
- Link: assign to a pin or function
- NC:
True= normally-closed,False= normally-open
Common Link Options
| Function | Type | Link syntax |
|---|---|---|
| Home sensor | Pin | HomePin,[Axis] |
| Positive limit sensor | Pin | LimitPin,[Axis] |
| Negative limit sensor | Pin | LimitPin,[-Axis] |
| Surface-detect sensor | — | SurfaceDetectorPin |
| Trigger surface detect (e.g. Z axis) | — | SurfaceDetector,Z |
| Emergency stop | Function | Emergency |
Table 2 – Input link options
Best practice: use normally-closed (NC) switches for safety (NC=True).
Industry terms:
- NPN = Sink = Low-Active
- PNP = Source = High-Active
Wiring Examples
Figure 7 – NPN (sink) wiring
Figure 8 – PNP (source) wiring
Updated 4 days ago