BRAD TCDEI-8D0P-DYU-G02: INFI-90 Digital Output Module | Specs, Alternatives & Availability

Technical Dossier

Product Details And Specifications

BRAD INFI-90 Series: Comprehensive Module Range and Technical Overview

The BRAD (Bailey Controls) INFI-90 Distributed Control System is one of the most widely deployed DCS platforms in global heavy industry. Installed across petrochemical complexes, nuclear power stations, crude oil refineries, pulp and paper mills, and large-scale power generation facilities, the INFI-90 architecture established a benchmark for modular, rack-based process control during the 1980s and 1990s. The platform's longevity is attributable to its deterministic bus communication, hot-standby redundancy capability, and a broad catalog of I/O and controller modules that allowed engineers to configure systems precisely to process requirements. The TCDEI-8D0P-DYU-G02 is a digital output module within this ecosystem, designed for discrete control applications requiring isolated relay or transistor-driven outputs in demanding industrial environments.

The Evolution of INFI-90 Architecture

The INFI-90 platform was introduced by Bailey Controls in the mid-1980s as a successor to the Network 90 system. Its architecture is built around the Plant Loop and Module Bus communication hierarchy, where Intelligent Nodes (INMs) coordinate data exchange between I/O modules and the supervisory layer. Early revisions of the system used parallel backplane communication; later generations introduced the INFI-NET token-passing network for plant-wide integration.

Following ABB's acquisition of Bailey Controls in 1989, the INFI-90 product line was progressively integrated into ABB's Advant and later Symphony Plus portfolios. Modules manufactured under the BRAD designation are fully compatible with ABB-branded INFI-90 racks and power supplies. The TCDEI prefix denotes a Texas Instruments-compatible digital I/O module family within the INFI-90 catalog. As the platform has entered its end-of-life phase for new installations, the primary demand driver is spare parts procurement for operational continuity at existing sites. DriveKNMS maintains stock of both current-production and obsolete INFI-90 modules to support this requirement.

INFI-90 Full Catalog & Functionalities (SKU List)

The following SKUs represent verified, commonly sourced modules within the BRAD INFI-90 platform. Modules are classified by functional category.

Digital Output Modules

• TCDEI-8D0P-DYU-G02: 8-channel digital output module, isolated, process I/O for discrete control loops
• TCDEI-8D0P-DYU-G01: Earlier revision of the 8-channel digital output module, compatible with standard INFI-90 racks
• TCDEI-16D0P-DYU-G01: 16-channel digital output module, high-density discrete output for large I/O count applications
• TCDEI-8D0R-DYU-G01: 8-channel relay output module, dry contact outputs rated for 2A resistive loads

Digital Input Modules

• TCDEI-8DIP-DYU-G01: 8-channel digital input module, 24VDC field input, optically isolated
• TCDEI-16DIP-DYU-G01: 16-channel digital input module, high-density discrete input scanning
• TCDEI-8DIP-DYU-G02: Revised 8-channel digital input, improved noise immunity for high-interference environments

Analog Input Modules

• IMASI03: Analog signal input module, 8-channel, 4–20mA / 1–5V configurable
• IMASI04: Analog input module with enhanced resolution, supports thermocouple and RTD inputs
• IMASI05: High-speed analog input module for fast process variables
• IMASM03: Analog signal multiplexer module, 16-channel input expansion

Analog Output Modules

• IMASO01: Analog signal output module, 4-channel, 4–20mA output for final control elements
• IMASO02: 8-channel analog output module, dual-range output configuration

Controller & Communication Modules

• IMMFP02: Multi-function processor module, primary controller for INFI-90 nodes
• IMMFP12: Enhanced multi-function processor, increased memory and scan rate over IMMFP02
• IMCPM02: Communication processor module, INFI-NET interface for plant-level data exchange
• IMCPM03: Upgraded communication processor with dual-port INFI-NET connectivity
• IMDSO14: Data storage output module, historian interface for process data archiving

Power Supply Modules

• IMPS02: Power supply module, 24VDC output, standard rack power for INFI-90 I/O nodes
• IMPS10: Redundant power supply module, hot-swap capable for continuous operation

Sourcing Hard-to-Find & Obsolete INFI-90 Parts

The BRAD INFI-90 platform was formally discontinued for new project engineering by ABB in the early 2000s, with the Symphony Plus platform designated as the migration path. However, the installed base at refineries, power stations, and chemical plants remains substantial, and full system replacement is not economically viable for many operators. The result is sustained demand for spare modules — including the TCDEI-8D0P-DYU-G02 — that are no longer manufactured.

DriveKNMS maintains a dedicated inventory of INFI-90 spare parts sourced through authorized surplus channels, decommissioned plant buybacks, and manufacturer overstock. Each unit is cataloged by part number, revision level, and functional test status. For obsolete modules where new-old-stock is unavailable, DriveKNMS can source tested-used units with documented test records. Customers operating under long-term maintenance contracts or planning scheduled outages are encouraged to submit consolidated parts lists for batch quotation.

Quality Control for the INFI-90 Range

INFI-90 modules present specific test challenges due to their backplane-dependent communication architecture. Functional verification of a module such as the TCDEI-8D0P-DYU-G02 requires simulation of the Module Bus protocol to confirm that the module correctly receives output commands and drives its field terminals. DriveKNMS employs the following test procedures for INFI-90 digital output modules:

• Visual inspection of PCB, connector pins, and output relay or transistor components for physical damage or corrosion
• Power-on self-test verification: module must complete initialization sequence without fault LED activation
• Module Bus communication test: simulated node controller issues discrete output commands; each channel is verified for correct switching state
• Output load test: each channel is loaded to rated current and verified for voltage drop within specification
• Isolation test: field-side to logic-side isolation resistance measured at 500VDC; minimum 10MΩ required
• Thermal soak: module operated at elevated ambient temperature for 2 hours to screen latent component failures

Test records are retained and available to customers on request. Modules that fail any test stage are quarantined and not offered for sale.