Description
This rack-mounted hardware component processes digital inputs and manages relay outputs within the Mark VI turbine control system, interfacing field signals with the central control processors via the VME backplane.
Commercial and Supply Chain Status
- Condition: New Original (New Surplus) or Refurbished (Fully Cleaned, Tested, and Certified)
- Warranty: 12-Month Industrial Component Warranty
- Availability: In Stock / Available as an Exchange or Direct Sale Unit
- Lead Time: Ships within 1 to 2 business days from order confirmation
- Pricing: Price subject to hardware lifecycle availability and market demand; contact us for a firm quote.
Technical Specifications
| Parameter | Value |
| Product Line | Mark VI Speedtronic Turbine Control System |
| Board Model Number | IS200VCRCH1B |
| Slot Compatibility | Installs into a standard 13-slot or 21-slot VME control rack |
| Primary Function | Discrete/Digital Input and Output Processing |
| Backplane Interface | VMEbus Standard compliance (A24/D16 or A32/D32 data paths) |
| I/O Interface Connections | Front-panel high-density cable connectors linked to terminal boards |
| Input De-bounce Filtering | Hardware-based configurable digital filter constants |
| Diagnostic Capabilities | Logic-state tracking, open circuit, and short circuit monitoring |
| Operating Temperature | 0 to +60 °C (+32 to +140 °F) inside the control enclosure |
| Conformal Coating | Standard industrial protection against particulate deposition |
Architecture and Backplane Integration
The IS200VCRCH1B is a core component of the Mark VI VME rack architecture. It functions as an intelligent interface board that unloads processing overhead from the primary control engine (such as the VCMI or UCVP boards) by handling raw digital filtering and relay feedback sequencing locally.
Data Path and Signaling
- Front Panel Connectors: The board receives raw field inputs via shielded, high-density ribbon cables that connect directly to external passive terminal boards (e.g., TBCI or TRLY).
- VMEbus Communication: Once inputs are filtered and digitized, the board places the state data onto the VME backplane. The main control processors query these states at the start of each control frame (typically a 10 ms or 40 ms frame rate).
- Output Commands: When the application logic demands a relay trip or closure, the command is transmitted via the VMEbus to the IS200VCRCH1B, which then energizes the corresponding driver line to actuate the terminal board interposing relays.
Suffix Layout Verification (H1B)
- H1: Designates the specific mechanical form factor and base electronic component layout (standard single-slot VME board width).
- B: Denotes a factory revision level. Revision “B” typically includes component-level optimizations to improve thermal dissipation and noise immunity over the original baseline revision board.
Engineering Insights: Installation and Lifecycle Maintenance
Electrostatic Discharge (ESD) Protection
⚠️ CRITICAL HANDLING NOTE: The IS200VCRCH1B contains highly sensitive CMOS-based programmable logic arrays and micro-controllers that can be permanently degraded by static electricity. Always wear a grounded ESD wrist strap before removing the board from its anti-static packaging or inserting it into the VME chassis.
Cold-Swap System Constraint
Unlike the later Mark VIe distributed I/O packs, the Mark VI VME boards do not support hot-swapping under load.
- Procedure: The VME rack power supply unit must be completely powered down before removing or inserting the IS200VCRCH1B module. Pulling a board while the VME backplane is energized can cause transient data line corruption, potentially locking up neighboring critical boards or causing an unplanned total system trip.
Seating and In-Rack Alignment
When replacing the board, ensure it slides cleanly along the upper and lower plastic card guides within the rack. Push the board firmly into the backplane until the top and bottom injector/ejector handles are completely locked. Tighten the front panel retention screws to ensure a continuous chassis ground connection.
Frequently Asked Questions
Q: Can the IS200VCRCH1B be directly interchanged with an IS200VCRCH1A board? A: In most firmware configurations, the “B” revision is backward compatible with the “A” variant, acting as a functional drop-in replacement. However, verify your system topology and Toolbox configuration settings to ensure that any physical differences or timing updates introduced in the “B” revision are supported by your project’s runtime software layout.
Q: What do the front panel diagnostic LEDs indicate during normal operation? A: The board typically features standard status LEDs on its faceplate. A solid Run/OK green LED indicates that the onboard microcontroller has passed its internal initialization scripts and is actively communicating across the VMEbus. A Fault or Status amber/red LED indicates an diagnostic trip, such as an internal memory corruption error or a loss of sub-rail power.
Q: Does this board contain the active interposing relays for field devices? A: No. The IS200VCRCH1B contains only the low-power solid-state driver circuits and opto-isolators. The actual high-current interposing relays or terminal screw connection paths reside on the external terminal blocks located elsewhere inside the low-voltage bay cabinet.
