DS4520B1SA - Processor R, S, T, C Module

SPECIFICATIONS

Part Number: DS4520B1SA
Manufacturer: General Electric
Series: Mark IV
Product Type: Processor R, S, T, C Module
Architecture: Triple Modular Redundant (TMR)
Communication Protocols: RS-232 / RS-485
Communication Interface: High-speed backplane
Processor Channels: R, S, T, C
Function: Monitoring, Control, Protection, Communication
Power Supply: 24V DC
Operating Temperature: 0°C – 70°C
Board Size: 15.7 cm High x 18.5 cm
Isolation Voltage: 1500 VAC
Repair: 3-7 Days
Weight: 2.00 lbs
Country of Origin: USA
Availability: In Stock

FUNCTIONAL DESCRIPTION:

DS4520B1SA is a Processor R, S, T, C Module manufactured and designed by General Electric as part of the Mark IV Series used in GE Speedtronic turbine control systems. It forms part of a Triple Modular Redundant (TMR) architecture, comprising three independent processors (R, S, T) and a communications processor (C) to enhance system reliability. The module performs critical tasks, including monitoring turbine parameters such as speed, temperature, and pressure, controlling operations to maintain optimal performance, providing protection by detecting and responding to faults, and facilitating communication between processors and external systems through RS-232 or RS-485 interfaces. Its modular design allows for easy maintenance, upgrades, and ensures continuous operation even if one processor fails, making it essential for the safe and efficient functioning of gas and steam turbines.

OPERATION:

The Processor R, S, T, C Module operates as the central computational unit in the GE Speedtronic control system, executing all turbine sequencing, protection, and monitoring functions. The module employs a Triple Modular Redundancy (TMR) design across the R, S, and T processors, with the C processor functioning as a comparator for validation and fault detection.
Input signals from turbine field sensors (speed pickups, temperature probes, pressure transducers, etc.) are digitized and transferred to the processor module through associated input cards.

• The R, S, and T processors execute identical control algorithms in parallel, ensuring consistent output across channels.
• Outputs from each processor are subjected to a majority-voting logic, where the correct signal is selected even if one processor path fails.
• The C channel continuously compares results from the three main processors to detect discrepancies and initiate fault isolation.
• Processed signals are transmitted via the system backplane to actuator and relay output modules, which control fuel systems, valves, protection relays, and auxiliary devices.
• Continuous self-diagnostics run in the background, monitoring processor health and system integrity to ensure uninterrupted turbine operation.

COMPATIBILITY:

The Processor R, S, T, C Module is engineered for seamless integration into GE Speedtronic turbine control platforms, specifically the Mark IV and Mark V series. Its architecture supports multi-channel redundancy and aligns with the communication protocols and backplane interfaces of these systems.
System Integration: Fully compatible with GE Speedtronic Mark IV / Mark V control systems, where it operates as the central processing unit.

• I/O Interface Support: Works with analog and digital input/output modules for sensor acquisition and actuator control.
• Board-Level Interoperability: Designed to interconnect with memory cards, exciter boards, communication processors, and sequencing modules within the same rack.
• Application Range: Suitable for gas turbines, steam turbines, and generator protection systems in both industrial and utility-scale environments.
• Form Factor: Conforms to the physical and electrical slot specifications of Speedtronic racks, ensuring direct replacement and backward compatibility.

World of Controls offers the largest stock of GE Speedtronic Gas Turbine control system replacement parts, including unused and rebuilt boards, all backed by a full warranty. We also provide expert repair services for faulty boards, restoring them to OEM standards to ensure reliable turbine operation. Our team of automation specialists is available 24/7 to support your OEM needs, provide technical guidance, and assist with any control system requirements. For pricing, availability, or technical assistance on parts and repairs, please contact us by phone or email.

REQUENTLY ASKED QUESTIONS:

What communication method is used between the processors and I/O cards?

The module communicates via the system backplane, using high-speed data transfer for input acquisition, control logic execution, and output signal distribution.

Can this module be used in both gas and steam turbines?

Yes, the Processor R, S, T, C Module is designed for both gas and steam turbine applications, ensuring compatibility across a wide range of industrial and power generation systems.

How does the module ensure output reliability during conflicting processor results?

A voting mechanism compares outputs from R, S, and T channels. The majority result is selected as the valid control output, while the C channel verifies consistency.