SPECIFICATIONS
Part No.: IS200VSCAH2AAB
Manufacturer: General Electric
Country of Manufacture: United States of America (USA)
Number of Serial Ports 6 per board
Size:10.25 in. x 0.78 x 7.375 in
Product Type: Serial Communication Input/Output Board
Availability: In Stock
Series: Mark VI
Functional Description
IS200VSCAH2AAB is an Serial Communication Input/Output Board developed by GE. It is a part of the Mark VI control system. The Serial Communications Board serves as a vital component in the system's communication infrastructure, enabling interactions with external devices through various serial communication protocols such as RS-232C, RS422, and RS485.
Associated DIN-Rail Mounted Serial Communications Terminal Board
The DSCB, mounted on a DIN rail, acts as the interface between the VSCA and external devices. The wiring between the VSCA and DSCB is facilitated through the J6 and J7 front panel connectors, each utilizing a 37-pin D shell connector with group shielded twisted pair wiring.
Connection Details:
- Parallel Connectivity: The J6 and J7 front panel connectors are parallel connected, ensuring efficient and reliable data transfer. This parallel connection uses 37-pin D shell connectors, enhancing the connectivity between the board and the DSCB.
- External Device Connectivity:Connectivity between the terminal board and external devices is established through Euro-Block. This connection employs screw terminations and twisted shielded pair AWG18 wiring, providing a secure and organized interface for various external devices.
- Ground Connection: The terminal board includes two screws designated for SCOM (ground). These screws must be connected to a robust shield ground, ensuring proper grounding and minimizing the risk of electrical interference.
Communication Distance and Baud Rates:
- RS422 and RS485: The DSCB can interface with external devices up to distances of 1000 ft for RS422 and RS485 communication protocols. The supported baud rates for these protocols can reach up to 375 kbps, catering to high-speed communication requirements.
- RS-232C: For RS-232C, the communication distance is limited to 50 ft or 2500 pF of cable capacitance, inclusive of the cable from the module to the DSCB. This protocol is suitable for shorter-distance communication applications.
- Modem Support and Long-Distance Communication: The DSCB supports short haul modems, allowing for extended communication distances beyond the specified cable lengths for RS422, RS485, and RS-232C.
Physical interfaces
- Physical Interface to Electric Drives: The physical interface to electric drives plays a crucial role in facilitating seamless communication and power exchange. The system's architecture is depicted in the provided figure, illustrating the connectivity and components involved.
- Honeywell Transducer Interface using DSCB (Refer to GEU-100046): For details regarding the interface with Honeywell transducers utilizing the DSCB, the specific guidelines and technical information can be found in the documentation titled GEU-100046. This documentation provides comprehensive insights into the integration of Honeywell transducers with the DSCB, ensuring accurate and efficient communication.
- Power Interface to Honeywell Transducers using DPWA (Refer to GEU-100098): For information related to the power interface to Honeywell transducers utilizing DPWA, it is recommended to refer to the documentation titled GEU-100098. This documentation outlines the power interface specifics, ensuring that the Honeywell transducers receive the necessary power supply for optimal performance.
- Special Connections for RS485 Applications: In scenarios where RS485 applications involve the VSCA and DSCB located somewhere in the middle of the transmission path, special considerations must be taken into account. The potential length of the connection introduces substantial stub length, which can impact signal quality.
- Parallel Wiring of Two DSCB Boards: To address the challenges associated with stub length in RS485 applications, the VSCA supports the connection of two DSCB boards effectively wired in parallel. This configuration allows RS485 signals to enter one DSCB, pass through the VSCA equipped with the RS485 transceiver, and exit through the opposite DSCB. By adopting this approach, the stub length of the RS485 path is minimized, ensuring improved signal quality and integrity.
- Optimizing RS485 Signal Path: The parallel wiring of two DSCB boards not only minimizes stub length but also optimizes the RS485 signal path. This configuration helps maintain the reliability and stability of RS485 communication, even when dealing with longer transmission distances between the VSCA and DSCB.
The WOC team is always available to help you with your Mark VI requirements. For more information, please contact WOC.
Frequently Asked Questions
What is IS200VSCAH2AAB?
It is an Serial Communication Input/Output Board developed by GE under the Mark VI series.
How does the board handle communication issues on its ports?
The board monitors each port for communication problems. If it detects issues such as no response, bad data, or a non-functional port, it sets a diagnostic fault. This fault, known as L3DIAG VSCA, covers the entire board and can be individually latched and reset using the RESET DIA signal.
What information is stored in the ID device of terminal and I/O boards?
Each terminal and I/O board has its own ID device containing crucial details such as the serial number, board type, revision number, and JA1 connector information. Mismatch during interrogation triggers a hardware incompatibility fault.
How are diagnostic signals managed in the system?
Diagnostic signals, including communication faults and hardware incompatibility, can be individually latched for detailed analysis. These signals are reset using the RESET DIA signal once the issues are addressed.
What happens when there is a hardware incompatibility in the ID interrogation process?
In case of a hardware incompatibility due to a mismatch during ID interrogation, a fault is created. This fault promptly alerts the system to address any inconsistencies in hardware configuration, ensuring optimal performance.
