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You are here: Pinetek Networks Knowledge Base » IOL HAT Knowledge Base » Frequently asked questions about the IOL HAT » Q: I attached an IO-Link solenoid to the IOL HAT, but on switching, the communication fails
iol-hat:faq:solenoids

Errors like this one appear before failure: 

[16:37:36 ERROR] PL: Got status error, REG_Status=0x00

A: The solenoid is causing transients on L+

Some solenoids do not have a proper free-wheeling diode which causes spikes on L+.

To solve this, do these steps either singly or in combination:

  • Use the parameter -b (e.g. -b 2) to increase the blanking time. This makes the error detection more tolerant to voltage surges.
  • Connect a capacitor in parallel to L+ and GND (e.g. 10µF). This will buffer the spikes.
  • If possible, connect a free-wheeling diode to the coil.
iol-hat/faq/solenoids.txt · Last modified: by anla