BRAD TCDEI-8D0P-DYU-G02 Digital Output Module

Technical Dossier

Product Details And Specifications

BRAD INFI-90 Series Technical Notes

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.

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.

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