Phidgets Forums

Is there a way to stop the REL1101 relay module from turning off the relays when my application shuts down.

Also is there any way to default the relays to on when the system powers up?

No, we have intentionally designed Phidget22 to reset all devices to an OFF state when they are closed, and when they are re-opened.

You can read this form post that explains our reasoning.

Well that's the end of using the REL1101 for this project then.

Thanks for the response.

If your system needs the default state to be closed (on), you'll probably have to use a board with mechanical relays, and use the Normally Closed terminal blocks. This way your state in 'On' even if the Phidget is not powered or plugged in. If you need to use SSRs for some reason (longevity, PWM, etc.), you probably need to rethink your system.

-Patrick

At present the system is using two KTA323's for controlling power to subsystems.
As the project is a sustainable solar powered unmanned surface vessel we cannot afford the power used by coil relays.
The solid state relays would be ideal if they could maintain their on/off state while the process controlling them needed a restart or had a forced restart.

Thanks
Lloyd