Fuji Electric NQ2P Series Modules: NQ2P20R-14

Technical Dossier

Product Details And Specifications

Fuji Electric NQ2P Series: Comprehensive Module Range and Technical Overview

The Fuji Electric NQ2P series is a compact, high-performance programmable controller platform deployed extensively across global heavy industry sectors including petrochemical refineries, chemical processing plants, power generation facilities, and discrete manufacturing lines. The NQ2P architecture is characterized by its modular backplane design, high-speed CPU execution, and broad I/O expansion capability, making it a standard-specification controller in mid-scale automation projects throughout Asia-Pacific, the Middle East, and Europe. Its installed base spans legacy systems commissioned in the 1990s through to units still in active production support, creating sustained demand for both new and refurbished spare parts.

The Evolution of NQ2P Architecture

The NQ2P series was introduced by Fuji Electric as a successor to the earlier NQ series compact PLCs, targeting applications requiring higher I/O density and improved network integration. Early NQ2P units operated on a proprietary backplane bus with fixed I/O configurations. Subsequent hardware revisions introduced modular expansion racks, enabling engineers to scale from 14-point base units up to 256+ I/O points through cascaded expansion modules. Communication capabilities evolved from RS-232C and RS-485 serial interfaces to include Ethernet TCP/IP adapters and Profibus-DP connectivity, allowing NQ2P controllers to integrate into modern SCADA and DCS architectures without full system replacement. The NQ2P20R-14 specifically represents the relay-output variant of the 20-point base unit, a configuration widely specified in motor control and solenoid valve applications due to its mixed AC/DC load switching capability. As the NQ2P series has entered its mature lifecycle phase, Fuji Electric has transitioned new project specifications toward the NX series and SPH series platforms; however, the NQ2P remains in active maintenance support across thousands of installed sites globally.

NQ2P Full Catalog & Functionalities (SKU List)

The following SKUs represent verified, commonly stocked models within the Fuji Electric NQ2P series. Models are classified by functional category.

CPU / Base Units

• NQ2P20R-14: 20-point base unit, 14 DI / 6 relay DO, built-in RS-232C port
• NQ2P20T-14: 20-point base unit, 14 DI / 6 transistor DO (sink), high-speed pulse output
• NQ2P20S-14: 20-point base unit, 14 DI / 6 transistor DO (source), NPN/PNP selectable
• NQ2P28R-14: 28-point base unit, 16 DI / 12 relay DO, expanded relay output capacity
• NQ2P28T-14: 28-point base unit, 16 DI / 12 transistor DO, pulse train output capable
• NQ2P36R-14: 36-point base unit, 20 DI / 16 relay DO, mid-range I/O density
• NQ2P36T-14: 36-point base unit, 20 DI / 16 transistor DO, suitable for servo interface

Digital Input (DI) Expansion Modules

• NQ-X16D: 16-point DC digital input expansion module, 24VDC sink/source
• NQ-X32D: 32-point DC digital input expansion module, high-density I/O expansion
• NQ-X8D: 8-point DC digital input module, compact slot-mount design

Digital Output (DO) Expansion Modules

• NQ-Y16R: 16-point relay output expansion module, 250VAC / 2A per point
• NQ-Y16T: 16-point transistor output expansion module, 24VDC / 0.5A per point
• NQ-Y32T: 32-point transistor output expansion module, high-density DO expansion

Analog Modules

• NQ-A4U: 4-channel analog input module, 0–10V / 4–20mA selectable per channel
• NQ-A2V: 2-channel analog output module, 0–10V voltage output, 12-bit resolution
• NQ-A4I: 4-channel analog input module, current input 4–20mA, for process instrumentation

Communication Adapters

• NQ-CL1: RS-232C communication adapter, point-to-point serial link for HMI/SCADA
• NQ-CL2: RS-485 multi-drop communication adapter, Modbus RTU master/slave
• NQ-ET1: Ethernet TCP/IP communication module, Modbus TCP and FINS protocol support

Sourcing Hard-to-Find & Obsolete NQ2P Parts

As the NQ2P series has entered its mature and end-of-production lifecycle, OEM channel availability for specific SKUs — particularly low-volume relay output base units such as the NQ2P20R-14 and analog expansion modules — has become constrained. DriveKNMS maintains a dedicated inventory of NQ2P series modules sourced through authorized secondary market channels, including decommissioned plant equipment, certified refurbishment programs, and regional distributor excess stock. All units are catalogued by firmware revision and hardware lot code to ensure compatibility with existing installed backplane configurations. For end-users operating NQ2P-based systems beyond the OEM support window, DriveKNMS provides lifecycle extension services including cross-reference to compatible NX series migration paths, firmware version documentation, and long-term consignment stocking agreements. Customers requiring emergency replacement units can typically expect same-day quotation response for in-stock NQ2P SKUs.

Quality Control for the NQ2P Range

The NQ2P series employs a proprietary backplane communication bus between the CPU base unit and expansion modules. DriveKNMS applies a multi-stage inspection protocol specifically adapted to this architecture. Each NQ2P base unit undergoes power-on functional verification including CPU scan cycle confirmation, I/O point-by-point actuation testing (both relay contact resistance measurement for relay-output variants and transistor leakage current verification for transistor-output variants), and serial communication port loopback testing. Expansion modules are tested under simulated backplane load conditions using a dedicated NQ2P test rack to verify bus arbitration integrity. Analog modules are calibrated against traceable reference standards with full-range linearity verification across all channels. Units exhibiting any deviation from factory specification are quarantined and not offered for sale. Test records are retained and available upon request for quality-critical procurement processes.