The ABB DSDX451 is a 32-channel digital b(DI)module designed for the ABB Advant OCS distributed control system.It acquires discrete status signals(e.g.,open/closed,on/off)from field devices such as limit switches,relay contacts,and push buttons.Typically operating with 24VDC b signals,the module features optical isolation between the field bs and the system bus,providing excellent noise immunity and protection for the control system.With a fast response time(<10ms)and built-in filtering to suppress contact bounce,the DSDX451 ensures reliable and accurate state monitoring.It is a key component for gathering operational and alarm status inbation in industrial applications,particularly in power generation plants utilizing the Advant OCS platb.