Toshiba ARND-3110 Modules 2N3A-3110-C CTR ARND-3110 Assembly Controller Board

Technical Dossier

Product Details And Specifications

Toshiba ARND-3110 Series Technical Notes

The Toshiba ARND-3110 series is a core component family within Toshiba's Unified Controller TOSDIC/TOSMAP distributed control system (DCS) platform, deployed extensively across global heavy industry sectors including petrochemical refineries, nuclear power generation facilities, pulp and paper mills, and steel production plants. The ARND-3110 architecture occupies a critical position in process automation infrastructure where long-term operational continuity, deterministic scan cycles, and high-density I/O integration are non-negotiable requirements. Installed base units across Asia-Pacific, the Middle East, and Europe continue to operate on this platform, creating sustained demand for verified spare parts and lifecycle extension support.

The Evolution of ARND-3110 Architecture

The ARND-3110 series was developed as part of Toshiba's second-generation TOSDIC DCS controller architecture, succeeding earlier ARND-2000 and ARND-2500 families. The platform introduced a modular backplane bus design that separated controller logic from I/O signal conditioning, enabling field replacement of individual modules without full system shutdown — a significant operational advantage in continuous-process industries.

Early ARND-3110 revisions used parallel bus communication between the CPU board and I/O sub-modules. Subsequent hardware revisions introduced serial backplane communication to reduce electromagnetic interference in high-noise industrial environments. The 2N3A-3110-C CTR ARND-3110 assembly controller board represents a mature revision of this architecture, integrating the control logic, watchdog timer circuitry, and backplane interface onto a single consolidated PCB assembly.

Compatibility considerations: ARND-3110 modules are not directly interchangeable with ARND-3200 or ARND-4000 series components due to differing backplane connector pinouts and firmware handshake protocols. Cross-series migration requires a full rack and firmware upgrade. For sites still operating ARND-3110 infrastructure, sourcing original-series spare parts remains the lowest-risk maintenance strategy.

ARND-3110 Full Catalog & Functionalities (SKU List)

Controller & CPU Modules

• 2N3A-3110-C CTR ARND-3110: Main assembly controller board; integrates CPU logic, backplane bus master, and watchdog timer for the ARND-3110 rack.
• 2N3A-3111-A CTR ARND-3110: Redundant controller board; hot-standby configuration for fault-tolerant process control loops.
• 2N3A-3112-B CTR ARND-3110: Enhanced CPU variant with expanded onboard SRAM for larger ladder logic programs.
• 2N3A-3113-C CTR ARND-3110: Controller board with integrated real-time clock module for time-stamped event logging.

Analog Input (AI) Modules

• 2N3A-3120-A AI ARND-3110: 8-channel analog input; 4–20 mA / 1–5 V DC; 12-bit resolution; HART pass-through capable.
• 2N3A-3121-B AI ARND-3110: 16-channel analog input; differential input configuration; 13-bit resolution with signal filtering.
• 2N3A-3122-A AI ARND-3110: Thermocouple input module; supports J, K, T, E, R, S, B type; cold junction compensation onboard.
• 2N3A-3123-C AI ARND-3110: RTD input module; PT100 / PT1000; 3-wire and 4-wire configurations; 0.1°C resolution.

Analog Output (AO) Modules

• 2N3A-3130-A AO ARND-3110: 4-channel analog output; 4–20 mA; 12-bit DAC; short-circuit protected outputs.
• 2N3A-3131-B AO ARND-3110: 8-channel analog output; voltage and current selectable per channel; isolated outputs.

Digital Input (DI) Modules

• 2N3A-3140-A DI ARND-3110: 32-channel digital input; 24 V DC; optically isolated; status LED per channel.
• 2N3A-3141-B DI ARND-3110: 16-channel digital input; 110/220 V AC compatible; surge-protected input circuitry.
• 2N3A-3142-A DI ARND-3110: High-speed pulse input module; frequency counting up to 50 kHz; for flow and speed measurement.

Digital Output (DO) Modules

• 2N3A-3150-A DO ARND-3110: 32-channel digital output; 24 V DC transistor; 0.5 A per channel; short-circuit protection.
• 2N3A-3151-B DO ARND-3110: 16-channel relay output; SPDT contacts; 2 A / 250 V AC; for motor starter and valve control.

Communication & Network Modules

• 2N3A-3160-A COM ARND-3110: RS-232/RS-485 serial communication adapter; Modbus RTU master/slave; for third-party device integration.
• 2N3A-3161-B COM ARND-3110: Ethernet communication module; 10/100 Mbps; Modbus TCP; for SCADA and historian connectivity.
• 2N3A-3162-A COM ARND-3110: PROFIBUS DP slave adapter; for integration with Siemens and ABB field device networks.

Power Supply Modules

• 2N3A-3170-A PSU ARND-3110: 24 V DC rack power supply; 10 A output; redundant input from 100–240 V AC.
• 2N3A-3171-B PSU ARND-3110: Redundant power supply module; hot-swap capable; for N+1 power redundancy configurations.

Sourcing Hard-to-Find & Obsolete ARND-3110 Parts

The ARND-3110 series has entered the mature-to-end-of-life phase of its product lifecycle. Toshiba has transitioned active development to the TOSDIC-V and VNET/IP platform families. However, the installed base of ARND-3110 systems in long-lifecycle industries — nuclear, refining, and utilities — means that demand for original spare parts remains active and will continue for the foreseeable future.

Quality Control for the ARND-3110 Range

ARND-3110 modules present specific quality verification challenges due to their integrated backplane bus architecture and mixed analog/digital signal paths. DriveKNMS applies a structured test protocol to all ARND-3110 units prior to dispatch: