DS200DENCF1ACG - Program Read-Only Memory Set

SPECIFICATIONS

Part Number: DS200DENCF1ACG
Manufacturer: General Electric
Series: Mark V
Product type: Program Read-Only Memory Set
Availability: In Stock
Country of Manufacture: United States (USA)

Functional Description

DS200DENCF1ACG is a Program Read-Only Memory Set designed and developed by GE. It is a part of Mark V control system. The Mark V system represents a significant technological leap in the realm of turbine automation. It is the culmination of decades of continuous learning and refinement in the field of automation, drawing from over 40 years of invaluable experience. A notable aspect is that during this period, more than 80% of the evolution has been attributed to the pioneering and widespread use of electronic control technology. This digital implementation of automation techniques builds upon a rich history of innovation and adaptability. It embodies the collective wisdom gained through years of successfully managing turbines, adapting to evolving needs, and harnessing the capabilities of electronic control systems.

Mark V control system Features

• The Mark V TMR control system employs a remarkable technology known as software-implemented fault tolerance (SIFT) to ensure the reliable operation of the control processors. This technology is a cornerstone of its robustness and fault-tolerant design.
• In the SIFT framework, each control processor within a TMR (triple modular redundant) control panel independently assesses control and protection functions based on separate inputs. The three control processors within the system individually vote on the inputs used to make these determinations. The key aspect of this approach is that if one control processor fails to correctly interpret an input, its erroneous value is essentially "out-voted" by the consensus of the other processors.
• To illustrate this, let's consider an example: A logic signal, which can represent either a logic "0" or a logic "1," comes from a pressure switch that monitors lube oil pressure. This signal is communicated to each of the three redundant processors within the TMR control panel through individual I/O communication networks (IONETs). Each processor interprets the signal independently, creating a pre-voted value. These pre-voted values are then communicated to the other two processors via a single data exchange communication network (DENET). Subsequently, each processor conducts a two-out-of-three "vote" on the logic signal's value and uses the majority-voted value in its control and protection algorithms and sequencing. This collective decision-making process ensures that a failure in one processor does not lead to a turbine trip signal being generated. In the event of a voting mismatch, a diagnostic alarm is reported.
• SIFT's significance lies in its ability to tolerate multiple failures without causing an unnecessary turbine trip. For instance, one control processor might determine that a turbine trip should be initiated based on low lube oil pressure, while another control processor might, due to a faulty thermocouple input, erroneously suggest a turbine trip based on high exhaust temperature. Without SIFT, these conflicting inputs could lead to a turbine shutdown. However, SIFT enables the control processors to use the collectively voted values of the inputs, preventing an unwarranted trip.
• Furthermore, the Mark V System features a useful function known as Control Lockout. This feature essentially puts the primary operator interface into a "view-only" mode, unless control capability is explicitly enabled with the correct password. It adds an extra layer of control and security, ensuring that only authorized personnel can make critical changes to the system.

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FREQUENTLY ASKED QUESTIONS

What is DS200DENCF1ACG?
It is a Program Read-Only Memory Set designed and developed by GE

What is SIFT, and why is it significant in the Mark V Control System?
SIFT is essential for ensuring the reliable operation of the control processors. It is a cornerstone of the system's robust and fault-tolerant design.

How does SIFT work in the Mark V Control System's framework?
In the framework, each control processor within a Triple Modular Redundant (TMR) control panel independently assesses control and protection functions based on separate inputs. These processors individually vote on the inputs used to make these determinations, ensuring consensus. If one processor fails to interpret an input correctly, its value is out-voted by the other processors.

What makes SIFT significant in terms of system reliability?
It is highly valuable because it can tolerate multiple failures without initiating a turbine trip. For instance, if one control processor recommends a turbine trip due to low lube oil pressure while another suggests a trip based on high exhaust temperature (due to a faulty thermocouple input), SIFT allows the control processors to use the collectively voted values, thus preventing an unnecessary trip.