24V MD4 with 12V relay on LS DOUT

Chuck Emmons 3 weeks ago in Master modules / MD4 updated by Gustav Widén (System support) 2 weeks ago 1

Can a 12V relay be driven by the LS DOUT of an MD4 supplied with 24V without protection or diagnostic issues?


Thank you Gustav.  You always have a knowledgeable answer.  

Satisfaction mark by Chuck Emmons 2 weeks ago

Yes, the MD4 Digital out low side makes a connection to ground, so for activating the coil it does not matter if the coil is supplied from an external 12 or 24 V. 

MD4 Digital out low side has open load detection when the DOUT is off that looks at the voltage. If there is no voltage on the pin when the output is off, this indicates open load. This works both in 12 and 24 V applications.