The GE IS420VCMIH2B, also cataloged as the IS200VCMI VME Communications Interface Module, operates as a dedicated hardware component for master backplane orchestration and inter-module data routing within GE Speedtronic Mark VI central control racks. Slot-mounted in position one of the main card rack, it executes deterministic data distribution across I/O boards, protection modules, and redundant IONet communications loops via front-panel DIN connectors.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | IS200VCMIH2B |
| Brand | General Electric (GE) |
| Series | Speedtronic Mark VI |
| Product Type | VME Communications Interface (VCMI) |
| Dimensions | Standard VME Rack Mount |
| Power Consumption | Rack backplane powered (125 VDC system architecture) |
| Connectors | 3x IONet DIN connectors, 1x 9-pin D-sub serial port, 2x VME backplane connectors |
| Onboard ICs | 2x Field Programmable Gate Arrays (FPGAs), 3x Signal Transformers |
Backplane Bus Communication Velocity and System Diagnostics
The IS200VCMIH2B serves as the bus master for the VME card rack, controlling backplane bus communication velocity and data synchronization across peripheral I/O cards. Board hardware includes an integrated 150 ms watchdog timer that initiates a processor stall routine to assert the SYSFAIL line and illuminate the red fault LED upon logic failure. Onboard FPGA components manage frame alignment and packet transmission protocols over the IONet1, IONet2, and IONet3 communication channels, maintaining firmware flash compatibility across redundant controller topologies.
Frequently Asked Questions
Q: What function does the 150 ms watchdog timer perform on the IS200VCMIH2B?
A: The watchdog timer monitors processor execution state; if a logic stall exceeds 150 ms, the board generates a SYSFAIL signal and activates the front-panel red LED.
Q: In which rack location must the IS200VCMIH2B module be installed?
A: The module must be inserted specifically into slot one of the Mark VI Central Control Module rack to function as the VME backplane bus master.
Q: What front-panel physical interfaces are available for network and diagnostic connections?
A: The faceplate features three DIN connectors for IONet channels (IONet1 through IONet3), one 9-pin male serial connector, one manual reset switch, and diagnostic status LEDs.
Field Installation Guidelines
- Confirm that 125 VDC control power to the Mark VI enclosure is isolated and verified zero-energy before handling the module.
- Put on a grounded electrostatic discharge (ESD) wrist strap prior to removing the IS200VCMIH2B from its protective packaging.
- Align the circuit board edges with the card guide rails for slot one in the Central Control Module rack.
- Push the board firmly into the rack until the dual rear VME pin connectors fully seat into the backplane receptacles.
- Tighten the top and bottom retaining screws on the front faceplate to ensure mechanical stability and chassis ground continuity.
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