SPECIFICATIONS
Part Number: DS200GASQF1CJD
Manufacturer: General Electric
Series: Mark V
Product type: GE Software EPROM Set
Availability: In Stock
Country of Manufacture: United States (USA)
Functional Description
DS200GASQF1CJD is a Software EPROM Set designed and developed by GE. It is a part of the Mark V control system. Extracting data from an EPROM involves a process of accessing specific memory locations by decoding the address provided at the EPROM's address pins. Once the address is decoded, it enables the connection to the output buffers, facilitating the retrieval of stored data from the memory cells.
Features
- Unlike the read process, the programming of an EPROM is non-reversible electrically. Once data is programmed into the EPROM, it cannot be electrically reversed or altered without a specific erasure procedure. The programming of EPROM cells involves applying higher-than-normal voltage levels to the cells, which changes the electrical charge within the memory cells. This alteration of charge within the cells effectively stores the data.
- However, to erase data from an EPROM, a different approach is needed. Ultraviolet (UV) light is employed as a means of erasing the stored information. When exposed to strong UV light, the photons in the light cause ionization within the oxide layers covering the memory cells. This ionization process allows the charge stored in the cells to dissipate gradually. As the charge dissipates, the previously programmed data is effectively erased or reset from the EPROM's memory cells.
- This erasure by ultraviolet light is a crucial characteristic of EPROMs, enabling the reusability of the memory cells. After the data is erased, the EPROM becomes ready to be reprogrammed with new data using the programming procedure, providing a cycle of programming, erasing, and reprogramming that makes EPROMs particularly useful in various applications requiring reusability and data update capabilities.
Mark V Contact and Solenoid Outputs
- The contact and solenoid outputs within the Mark V system are exclusively facilitated through plug-in type magnetic relays, without the utilization of solid-state outputs. These magnetic relays are specifically designed to control the status of contacts, offering a reliable and versatile approach to manage output functions.
- All contacts associated with these relays adhere to a form C configuration, which includes three wires: one normally open contact, one normally closed contact, and a common center conductor. This configuration provides flexibility in controlling electrical circuits, allowing for the opening and closing of connections based on system requirements.
- In a Triple Modular Redundancy (TMR) system setup, the three controllers-R, S, and T autonomously determine the status of the contact outputs. Each controller independently evaluates the system conditions and contributes to determining the status of the outputs. The final output status is determined via a two-out-of-three voting mechanism, which occurs at the relay driver level.
- The relay driver compares the output statuses provided by the three controllers. If there is a consensus among the controllers, where at least two out of the three agree on the output status, the relay driver implements this agreed-upon status for the contact output. However, in scenarios where there is a discrepancy among the controllers and they do not reach a consensus regarding the output status, a diagnostic alarm is generated and annunciated. This alarm serves as an indication that the controllers are not in agreement, prompting further investigation or corrective action to resolve the discrepancy and ensure proper functioning of the contact outputs.
- This two-out-of-three voting mechanism, along with the diagnostic alarm, enhances the reliability and fault-tolerance of the system by enabling effective monitoring and validation of contact output statuses, thereby ensuring accurate and consistent control in critical operations.
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FREQUENTLY ASKED QUESTIONS
What is DS200GASQF1CJD?
It is a GE Software EPROM Set designed and developed by GE
What type of outputs does the Mark V system use for contacts and solenoids?
The Mark V system employs plug-in magnetic relays exclusively for controlling contact and solenoid outputs. It doesn't utilize solid-state outputs, relying solely on these relays designed for reliable output management.
What is the configuration of the contacts associated with these relays?
All contacts in the system follow a form C configuration, comprising three wires- one normally open contact, one normally closed contact, and a common center conductor. This setup offers versatile control over electrical circuits based on system needs.
How is contact output status determined in the system?
In a Triple Modular Redundancy (TMR) setup, three controllers -R, S, and T autonomously assess system conditions to determine contact output status. A two-out-of-three voting mechanism at the relay driver level compares the controllers' output statuses. If a consensus is reached among at least two controllers, that status is implemented. A diagnostic alarm alerts discrepancies among controllers.
