The 24 V sensor supply (L+, pin 1) on one IO-Link port is shorted or overloaded, so the controller has switched that port’s supply off. The sensor on that port has lost power.
| At a glance |
|
| Code |
610 |
| Shown as |
IO-Link Supply Short |
| Severity |
Warning |
| Category |
6xx — Hardware |
| Raised for |
Each port on its own — IO-Link Port A or IO-Link Port B |
| Clears |
Automatically, once the port’s supply has run for 3 seconds without overloading |
| LED |
Power light, amber slow blink; Health light shows the warning |
New in an upcoming firmware update. Earlier firmware does not raise this alarm.
- Waits a second. A brief overload — inrush when a sensor is plugged in or the port turns on — is handled by the port’s own current limit and is never cut. Only an overload that lasts 1 second counts.
- Cuts L+ on that port only. The other port keeps running. Cutting the shorted port stops the IO-Link chip overheating, which would otherwise take both ports down.
- Raises this alarm for that port, and shows amber slow blink on the Power light — see What the LEDs Mean.
- Tries again every 30 seconds. If the short is still there, the supply is cut again after another second. The alarm stays up through the retry, so it does not flicker on and off.
- Clears the alarm by itself once the supply has run for 3 seconds clean. The sensor then starts up again.
While the supply is cut, the port stays off even if its settings are changed or the port restarts, so nothing re-energizes the short.
The sensor on the port drops out, so expect a Device Disconnected (100) alarm for it too, and control modes that use it go to their safe state.
| Cause |
What to look for |
| Damaged sensor cable |
Crushed, cut, or chafed cable; water in an M12 connector. The most common cause. |
| Miswired cable |
L+ (pin 1, brown) wired to GND (pin 3, blue) in a field-wired connector. |
| Failed sensor |
The fault stays with the sensor when moved to another port. |
| Too much load on L+ |
Something besides the sensor powered from pin 1 — a relay coil, a second sensor, an indicator lamp. |
Before you start: see Safety. A sensor may be mounted on a tank or pipe that is under pressure or holds chemicals.
- Find the port. The alarm names it — IO-Link Port A or B.
- Unplug the sensor from that port. If the alarm clears within about 30 seconds, the port is fine: the fault is in the sensor or its cable.
- Plug the sensor in with a known-good cable. If it now works, replace the cable.
- If it still faults, try the sensor on the other port. A fault that moves with the sensor is the sensor.
- If the port faults with nothing plugged in, contact support: the fault is on the controller.
You can also turn L+ Power off on that port while you work — see Port power. A supply switched off on purpose is never treated as faulted.
- Not the same as a Power Fault (600). A 600 is the controller’s own input supply; this is the supply the controller gives one sensor. The Power light tells them apart: red fast blink for 600, amber slow blink for this alarm.
- While input power is low, this alarm is not raised or cleared — a sagging input can look like an overload. Fix a 600 first.
- The C/Q line has its own alarm. An overload on the data or output pin is IO-Link C/Q Overload (611).