DG4S error line question.

[Derek]

I'm really having a hard time getting my arms around this. I have 2 HDBB2 boards with 5 DG4S drives. The current setup works perfectly in that If a drive faults it faults the other 4 drives and estops the system. I want to add a relay to the system to have an external event fault the drives. In the DG4S manual it says "if any of the drive has an internal fault, it pulls the error line low indicating the fault and stopping all other drives.". So it looks to me like the drive when it faults is taking the 0 volt from pin 3 on the RJ45 and applying it to pin 6 and this pulls the pin6 "low". This in turn pulls all the other drives low and the HDBB2 signals the controller to estop.

If this is correct then if I connect my relay to 3 and 6 on the HDBB2 RJ45 plug and when the relay closes it will act like a drive has faulted.

Am I on the right track. Logic circuits scare me as it's so easy to let the magic smoke out:)

Thanks
Derek