The DUPLEX SMART-S controller is a compact control system with full redundancy for small tasks. The product series GA DUPLEX-S is designed with two identical sets of hardware components. Internally each of these components uses a redundant, fault-tolerant design. This allows quadruple redundant signal processing of all I/O signals, with mutual comparison between both systems. This redundancy significantly increases the systems’ processing reliability and availability. Even in the event of a component failure, the system safely continues to work and can be repaired during operation.