I am currently working on creating a tool issuance system. This consists of 20 lockers whose doors are controlled by solenoids. The solenoids are controlled using 3 DO modules and 1 RevPi CONNECT SE. This system is fed with a voltage of 24V and 10 A. But as soon as I start up the system, only the RevPi works and the power LED lights up green, and at the DO all 3 flash red at the power LED. I have configured the system several times in piCtory but it just does not get connected to the DO modules. Because when I run piTest -d it doesn't see any devices.
What should I do now?