IS200VSCAH2ABA - Serial Communication I/O Board

SPECIFICATIONS:

Part Number: IS200VSCAH2ABA
Manufacturer: General Electric
Series: Mark VI
Number of Channels: 24
Inputs: 125 V dc, 15A
Product Type: Serial Communication I/O Board
Output Fuses 12 fuses: 250 Volt, 15 A
Temperature Operating: -30 to +65 C
Microprocessor: Intel Celeron 300 MHz
Size: 26.04 cm high x 1.99 cm wide
Repair: 3-7 Day
Availability: In Stock
Weight: 2 lbs
Country of Origin: United States
Manual: GEH-6421V

FUNCTIONAL DESCRIPTION:

IS200VSCAH2ABA is a DC Power Distribution Board Manufactured and designed by General Electric as part of the Mark VI Series used in GE Speedtronic Gas Turbine Control Systems. The Serial Communication Input/Output (VSCA) board provides I/O interfaces for external devices using RS-232C, RS-422, and RS-485 serial communications. Currently, the IS200VSCAH2A version is available. The DSCB terminal board connects to external devices, which include intelligent pressure sensors such as smart Honeywell® pressure transducers and Kollmorgen electric drives. VSCA connects to the DSCB terminal board(s) through the J6 and J7 front panel connectors. These are parallel connected using 37-pin D shell connectors with group-shielded twisted pair wiring. For RS-422 and RS-485, DSCB can interface with external devices at distances up to 1000 ft, at baud rates up to 375 kbps. RS-232C's distance is only 50 ft or 2500 pF of cable capacitance (including the cable from VSCA to the DSCB). It supports short-haul modems for longer distances.

OPERATION:

The VSCA is a single slot board with six serial communication ports. Each port can be independently configurable as an RS-232C, RS-485, or RS-422 interface, using a three-position group jumper (berg array). Both RS-232C and R-S422 support full duplex. The line drivers on VSCA include appropriate termination resistors with configurable jumpers to accommodate multi-drop line networks. RS-422 and RS-485 outputs have tri-state capability. I/O goes to a high impedance condition when powered down. They do not cause significant disturbance when powered down/up (less than 10 ms) on a party line. The open wire condition on a receiver is biased to a high state.

• RS-232C supports: RXD, TXD, DTR/RTS, GND, CTS (five-wire)
• RS-422 supports: TX+, TX-, RX+, RX-, GND
• RS-485 supports: TX/RX+, TX/RX-, GND

DATA FLOW FROM VSCA TO CONTROLLER:

The data flow from VSCA to the UCV_ controller is of two types: fixed I/O and Modbus® I/O. Fixed I/O is associated with the smart pressure transducers and the Kollmorgen electric drive data. This data processes completely, every frame, as with conventional I/O. The required frame rate is 100 Hz. These signals are mapped into signal space, using the .tre file, have individual health bits, use system limit checking, and have offset/gain scaling.

Modbus I/O is associated with the Modbus ports. Because of the quantity of these signals, they are not completely processed in every frame. Instead, they are packetized and transferred to the UCV_ processor over the IONet through a special service. This accommodates up to 2400 bytes at 4 Hz, 9600 bytes at 1 Hz, or combinations thereof. This I/O is known as second-class I/O, where coherency is at the signal level only, not at the device or board level. Health bits are assigned at the device level, the UCV_ expands (fully populate) for all signals, and system limit checking is not performed.

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FREQUENTLY ASKED QUESTIONS:

What is a Serial Communication I/O Board?

A Serial Communication I/O Board is a hardware component used in industrial systems to facilitate communication between a controller and external devices via serial communication protocols such as RS-232, RS-422, and RS-485.

How do these boards support the common serial communication protocols?

Serial Communication I/O Boards typically support RS-232C, RS-422, and RS-485 protocols, enabling communication over different distances and configurations.

What is the maximum communication distance supported by RS-422 and RS-485 on these boards?

RS-422 and RS-485 can generally support communication over distances up to 1000 feet, depending on the baud rate and quality of the cable used.