Clay B.
Lifetime Supporting Member
Does anybody know why you would have a diode on a 24 vdc solenoid coil.
I am installing some sensors and a new DL-6 PLC on an existing peice of equipment and this diode blasted a couple of outputs before I found it. I reversed polarity going to these solenoids when I installed the new PLC (Old PLC sinking , new PLC sourcing outputs)and thats when the trouble started. Basically I shunted all of my current across this diode which in turn shorted out the output so when I turned this output off I still did not have any current. Once I saw the diode I realized what was going on. None of the solenoids use an indicating LED either.None of the other solenoids on the machine have a diode built into the plug.
It has been awhile since I sat thru an electronics class and I can not think of one good reason for this being here.
Thanks for any info or ideas
Clay
I am installing some sensors and a new DL-6 PLC on an existing peice of equipment and this diode blasted a couple of outputs before I found it. I reversed polarity going to these solenoids when I installed the new PLC (Old PLC sinking , new PLC sourcing outputs)and thats when the trouble started. Basically I shunted all of my current across this diode which in turn shorted out the output so when I turned this output off I still did not have any current. Once I saw the diode I realized what was going on. None of the solenoids use an indicating LED either.None of the other solenoids on the machine have a diode built into the plug.
It has been awhile since I sat thru an electronics class and I can not think of one good reason for this being here.
Thanks for any info or ideas
Clay