Yokogawa NFD Series Modules NFDV161-P51 S2

Technical Dossier

Product Details And Specifications

Yokogawa NFD Series Technical Notes

The Evolution of NFD Series Architecture

The NFD module lineage originates from Yokogawa's CENTUM CS platform (introduced in the mid-1990s), where digital I/O was handled by discrete plug-in cards communicating over a proprietary ESB (Expanded Signal Bus). With the transition to CENTUM CS 3000 (released 1998), Yokogawa introduced the FIO bus-based architecture, and the NFD series was redesigned to operate as intelligent field I/O nodes with onboard diagnostics and HART pass-through capability on select models.

The CENTUM VP platform (released 2008) retained backward compatibility with the NFD module form factor, allowing existing CS 3000 installations to migrate to VP without replacing field wiring or I/O hardware — a critical design decision that extended the NFD series' installed base well into the 2020s. As of 2026, the NFD series is in the mature/end-of-active-production phase. Yokogawa has transitioned new projects to the CENTUM VP R6 platform with updated Vnet/IP-based I/O, but the NFD form factor remains the dominant installed base in brownfield sites. Long-term maintenance support, spare parts availability, and certified refurbished modules are the primary procurement requirement for this series.

NFD Series Full Catalog & Functionalities (SKU List)

Digital Input Modules

• NFDV161-P51 S2: 16-ch 24VDC digital input, FIO bus, isolated, standard density
• NFDV141-P51 S2: 16-ch 100/120VAC digital input, FIO bus, field-isolated
• NFDV151-P51 S2: 16-ch 200/240VAC digital input, FIO bus, field-isolated
• NFDV162-P51 S2: 32-ch 24VDC digital input, high-density, FIO bus
• NFDV163-P51 S2: 16-ch 24VDC digital input with SOE (Sequence of Events) logging

Digital Output Modules

• NFDV261-P51 S2: 16-ch 24VDC transistor digital output, FIO bus, sourcing type
• NFDV241-P51 S2: 16-ch relay contact digital output, 250VAC/30VDC rated
• NFDV262-P51 S2: 32-ch 24VDC transistor digital output, high-density
• NFDV251-P51 S2: 16-ch 100/120VAC triac digital output, FIO bus
• NFDV263-P51 S2: 16-ch 24VDC digital output with pulse output capability

Analog Input Modules

• NFAI141-P51 S2: 8-ch 4–20mA analog input, HART-enabled, FIO bus
• NFAI143-P51 S2: 16-ch 4–20mA analog input, high-density, non-HART
• NFAI135-P51 S2: 8-ch thermocouple/mV analog input, multi-type
• NFAI136-P51 S2: 8-ch RTD/resistance analog input, 3-wire Pt100

Analog Output Modules

• NFAO141-P51 S2: 8-ch 4–20mA analog output, HART-enabled, FIO bus
• NFAO143-P51 S2: 16-ch 4–20mA analog output, high-density

Communication & Power

• NFCP701-P51 S2: FIO bus coupler / node controller for NFD I/O expansion
• NFPS701-P51 S2: 24VDC field power supply module for NFD node

Quality Control for the NFD Series Range

NFD series modules present specific test challenges due to their FIO bus communication protocol and onboard EEPROM configuration storage. DriveKNMS applies a multi-stage verification process: (1) Visual inspection for backplane connector wear, capacitor condition, and conformal coating integrity; (2) Powered bench test using a CENTUM VP R5/R6 test node to verify FIO bus enumeration and module self-diagnostics; (3) Channel-level functional test — each I/O channel is exercised at rated voltage/current to confirm signal acquisition or switching accuracy within Yokogawa's published tolerance bands; (4) HART communication verification on HART-capable analog modules using a calibrated HART communicator; (5) Final revision and firmware label check to confirm hardware revision compatibility with the target system software version. Modules that fail any stage are quarantined and not offered for sale.