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Low side outputs protection diode

Guillaume Fournier 6 years ago in Expansion modules / XC2x • updated by Gustav Widén (System support) 6 years ago • 1

Hello,

I need to drive relays on low side outputs on the XC-23 and MD4-5.  Do I need to use relays with included coil protection diodes or if the outputs of these modules are already internally protected ?

Thanks,

Guillaume

GOOD, I'M SATISFIED
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Answered
Gustav Widén (System support) 6 years ago

The low-side switches do have protection that will cut the switching transient, but this is not designed for repetitive operation. 

You should use a diode at the coil to avoid the transient. 

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