Yokogawa NFAI143-S50 S1: CENTUM VP Analog Input Module

Technical Dossier

Product Details And Specifications

Yokogawa NFAI Series Technical Notes

The Yokogawa NFAI series of analog input modules occupies a critical position in the global heavy-industry installed base. Deployed across petrochemical complexes, nuclear power stations, LNG terminals, and crude oil refineries, these modules serve as the primary signal acquisition layer within Yokogawa's CENTUM VP and CENTUM CS 3000 Distributed Control Systems (DCS). Their architecture conforms to Yokogawa's Field Control Station (FCS) backplane standard, enabling direct integration with Vnet/IP and ESB bus topologies without signal conditioning intermediaries. Installations spanning Southeast Asia, the Middle East, and Europe rely on NFAI modules for continuous 4–20 mA and voltage signal acquisition in SIL-rated and non-SIL process loops. The NFAI143-S50 S1 specifically provides 16-channel isolated analog input with HART pass-through capability, making it a standard specification item in greenfield and brownfield DCS projects.

NFAI Series Full Catalog & Functionalities (SKU List)

The following SKUs represent verified, commonly deployed modules within the Yokogawa NFAI and closely related CENTUM VP I/O series. Modules are classified by function:

Analog Input Modules

• NFAI143-S50 S1: 16-ch isolated analog input, 4–20 mA / 1–5 V, HART pass-through, ESB bus
• NFAI143-S00 S1: 16-ch isolated analog input, 4–20 mA / 1–5 V, no HART, ESB bus
• NFAI135-S50 S1: 8-ch isolated analog input with HART, high-density FCS slot
• NFAI135-S00 S1: 8-ch isolated analog input, no HART, standard FCS slot
• NFAI841-S50 S1: 16-ch analog input, Vnet/IP node, HART-enabled, CENTUM VP R4+
• NFAI841-S00 S1: 16-ch analog input, Vnet/IP node, no HART, CENTUM VP

Analog Output Modules

• NFAO145-S50 S1: 8-ch isolated analog output, 4–20 mA, HART pass-through, ESB bus
• NFAO145-S00 S1: 8-ch isolated analog output, 4–20 mA, no HART, ESB bus
• NFAO843-S50 S1: 8-ch analog output, Vnet/IP, HART-enabled, CENTUM VP

Digital Input Modules

• NFDI141-S00 S1: 32-ch digital input, 24 VDC, dry contact, ESB bus
• NFDI841-S00 S1: 32-ch digital input, Vnet/IP node, CENTUM VP
• NFDI143-S00 S1: 16-ch digital input, 24 VDC, isolated, high-density

Digital Output Modules

• NFDO141-S00 S1: 16-ch digital output, 24 VDC, transistor, ESB bus
• NFDO843-S00 S1: 16-ch digital output, Vnet/IP node, CENTUM VP

Communication & CPU Modules

• NFCP701-S00 S1: Field Control Unit (FCU) processor, CENTUM CS 3000 / VP compatible
• NFCP702-S00 S1: Enhanced FCU processor, dual-redundant configuration support
• NFBU100-S00 S1: ESB bus unit, backplane interface for NFAI/NFAO/NFDI/NFDO modules