Sensor/Actuator Box. SAI Active, Subbus, Complete Module. The trend from IP20 to IP67, or from control cabinets to cabinet-free machines, culminates in IP67 I/O slaves. With these plug & play solutions, the need to connect individual wires is completely eliminated. This results in significant time savings and eliminates errors that can occur when connecting individual conductors. Today, IP67 bus modules are the most modern and cost-effective solution for connecting sensors and actuators.