FnIO S-Series Modular Remote I/O Block (NA-9188 Fieldbus Coupler Base)

The Crevis FnIO S-Series is a modular remote I/O system in which a fieldbus coupler connects a row of I/O modules to a PLC network. NA-prefixed Crevis products are couplers, and NA-9188 is the coupler base in this entry; the fieldbus protocol was not confirmed. The coupler handles master communication and supplies system power to modules through an internal bus. Digital, analog and temperature modules plug side by side on DIN rail, with spring-clamp wiring and LED diagnostics.