1. Product Overview

2. Key Hardware Features

• Board Type: RST Milliamp Analog I/O Termination Board (TBQC), compatible with Mark V standard cabinet slots, supports Simplex and TMR triple‑modular redundancy architectures, suitable for LM series turbine RST control systems and interfaces with TCQA control boards.

• Interface Configuration: Equipped with 2 large terminal blocks (83 signal terminals per block, total 166 channels), 3 × 40‑pin connectors, 3 × 34‑pin connectors, 15 configuration jumpers (BJ1‑BJ15), dedicated TEST port for connecting field sensors, actuators and upper‑level TCQA control boards, realizing centralized access and expansion of milliamp analog signals.

• Signal Processing: Onboard isolation, filtering, current‑limiting and level‑matching circuits provide 2500Vrms electrical isolation to suppress industrial electromagnetic interference and eliminate ground loops, ensuring accuracy and stability of 4‑20mA/20‑200mA and LVDT/R position signals.

• Electrical & Environmental: 24VDC power supply; operating temperature -40°C to +85°C, industrial‑grade wide‑temperature design; PCB with conformal coating, anti‑vibration, corrosion‑resistant and EMI‑resistant for harsh power plant environments.

• Diagnosis & Maintenance: Integrated dedicated TEST port for on‑site channel testing and fault troubleshooting; 15 jumpers (BJ1‑BJ15) for connecting milliamp input channels 1‑15 to DCOM; modular design for easy installation, replacement and maintenance.

3. Core Functions

1. Milliamp Analog I/O Terminal Expansion: Expands 4‑20mA and 20‑200mA analog I/O channels of Mark V/RST systems, connects LVDT/R displacement/position sensors and process instruments to meet multi‑parameter monitoring requirements of turbine displacement, position, pressure and flow.

2. Signal Isolation & Conditioning: Performs electrical isolation, filtering, impedance matching and amplitude scaling on field milliamp analog signals and LVDT signals, eliminates field interference, improves signal accuracy, ensures reliable data transmission to TCQA control board for A/D conversion and control calculation.

3. Reliable Signal Transmission: As a terminal interface, transmits conditioned milliamp signals to upper‑level TCQA control boards, receives control commands and outputs to actuators to realize closed‑loop control; compatible with TMR redundancy architecture to avoid single‑point failures.

4. Field Wiring & Configuration: Large‑capacity terminal blocks standardize field cabling; jumpers enable flexible signal channel configuration; TEST port supports online detection of channel, power and signal status, quickly locates faults and reduces downtime.

5. Redundancy Compatibility: Supports Mark V TMR triple‑modular redundancy configuration to enhance system reliability, ensure continuous unit operation and prevent unplanned shutdowns.

4. Applications

• Power Industry: Milliamp analog I/O termination and LVDT position signal access for Mark V/RST control systems of LM series gas turbines and steam turbines in combined‑cycle and gas‑fired power plants.

• Industrial Sector: Analog signal acquisition and control terminals for heavy‑duty power units and industrial drive equipment in petroleum, chemical and metallurgical industries.

• Scenarios: Analog channel expansion, spare parts replacement, unit overhaul, control system upgrade and retrofitting of old units for Mark V systems.