产品描述SSS series solid state I/O module provide a connection between power lines and computer interface systems. Input modules sense the presence of either an ac or dc voltage, and will send a TTL signal back to the computer. They provide feedback to the computer, giving the system information it can act upon. Output modules receive TTL signals from the computer interface, and will switch ac or dc power lines on or off. These modules can be used for control systems, turning motors, actuators, etc. on or off.