Power-up state of DIO-96 lines

[DarrenC]

I am in the process of replacing a toggle-switch panel on a piece of high-tech manufacturing equipment with a DIO-96 and an ER-16 and ER-8.

I've noticed that the relays on the ER-8 and ER-16 will be in random states when powering up the PC that the DIO-96 is inside of. When I powered up the PC moments ago, every single relay is closed. This could have disasterous consequences to the manufacturing equipment, causing a robot arm to slam into a closed door on a chamber.

How can I ensure that every relay will be open on the ER-8/16 when I power up the host PC?

Thanks!
-darren

[Salvador_Santolucito]

The DIO-96 should power up with all of its lines in the high state. What revision of the board do you have (this info can be found in the board's serial or product number)?

For an application where safety is a concern, I would suggest passing the power to the ER-16 relays through a hard switch. Make sure the ER-16 is not powered before the computer comes on. This would prevent against a glitch that can cause an accident.

-Sal