GE IS215VCMIH2C
GE IS215VCMIH2C
GE IS215VCMIH2C
GE IS215VCMIH2C
GE IS215VCMIH2C

GE VCMI-H2C (IS215VCMIH2C) | VME Bus Master Controller – Field Service Notes

  • Model: VCMI-H2C (IS215VCMIH2C / IS215VCMIH2CC)
  • Alt. P/N: IS215VCMIH2CA, IS215VCMIH2CC
  • Product Series: GE Speedtronic Mark VI / VIe Turbine Control
  • Hardware Type: 6U VME Bus Master Controller & IONet Interface
  • Key Feature: 3×IONet (10BASE2) ports + dual-port memory for rack-level arbitration
  • Primary Field Use: Slot 1 VME master; manages IONet traffic & I/O rack ID assignment
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Part number: VCMI-H2C
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Description

Hard-Numbers: Technical Specifications

  • Processor: 32-bit TI TMS320C32 DSP (IS200) / 32-bit RISC (IS215)
  • Memory: 128KB dual-port RAM (VME ↔ IONet buffer)
  • VME Interface: VMEbus Rev C.1, master/slave, block transfer capable
  • IONet Ports: 3×BNC 10BASE2 (coax), 10Mbps, redundant ring support
  • Serial Port: 1×RS-232, 9.6k–38.4k baud, D-sub9
  • Parallel Port: 1×8-bit bidirectional EPP (IEEE 1284)
  • Operating Temp: -30°C to +65°C (C-coated: -40°C to +70°C)
  • Power Draw: 4.5A @ +5VDC (22.5W typical)
  • Form Factor: 6U Eurocard (17.8×33.0cm), single-slot
  • Protection: Conformal coated (acrylic) for humidity/corrosion resistance
  • Diagnostics: 4×front-panel LEDs (PWR, RUN, FAULT, IONET)
GE IS215VCMIH2C

GE IS215VCMIH2C

The Real-World Problem It Solves

Mark VI racks without a VCMI can’t arbitrate VME bus traffic or bridge IONet to local I/O. Uncontrolled bus masters cause collisions; unmanaged IONet rings drop turbine data or lose rack ID mapping.

Where you’ll typically find it:

  • Slot 1 of every Mark VI/VIe control rack (gas/steam turbine)
  • Offshore platform turbine control cabinets (coastal corrosion zones)
  • Combined-cycle power plant DCS I/O racks (IONet ring hubs)

Bottom line: It’s the mandatory VME master + IONet hub that keeps Mark VI racks synchronized, data flowing, and IDs assigned.

 

Hardware Architecture & Under-the-Hood Logic

This is the rack’s “traffic cop”: fixed slot-1 VME master, IONet ring manager, and I/O rack ID keeper. No user-configurable CPU—dedicated DSP/RISC for real-time arbitration.

  1. Backplane VME interface claims bus mastership; resolves slave conflicts with hardware arbitration.
  2. Dual-port RAM buffers data between VME bus and 3×IONet ports; prevents overflow during bursts.
  3. IONet controller manages 10Mbps token-passing ring; re-routes traffic on cable break.
  4. Onboard EEPROM stores rack ID, node addresses, and arbitration parameters; no jumpers needed.
  5. Watchdog timer (hardware) resets board if IONet/VME traffic stalls >100ms; triggers FAULT LED.

 

Field Service Pitfalls: What Rookies Get Wrong

Incorrect IONet TerminationTechs forget 50Ω terminators on unused BNC ports or daisy-chain coax without proper taps. IONet signal reflections cause intermittent data drops and ring splits.

  • Field Rule: Terminate all unused IONet BNCs with 50Ω; use only T-connectors for taps—no direct splices.

Slot Misplacement & Bus ConflictRookies install VCMI-H2C in slots 2–16 or mix with other VME masters. Multiple masters trigger bus errors, watchdog resets, and turbine trip faults.

  • Quick Fix: VCMI-H2C only in slot 1; set VME master jumpers to “slot 1” (factory default).

Coating Damage During ProbingTechs scrape conformal coating probing backplane pins or test points. Exposed traces corrode in humid plant air; leads to intermittent VME/IONet faults.

  • Field Rule: Use insulated fine-tip probes; seal scratches with matching acrylic coating post-service.
GE IS215VCMIH2C

GE IS215VCMIH2C

Commercial Availability & Pricing Note

Please note: The listed price is for reference only and is not binding. Final pricing and terms are subject to negotiation based on current market conditions and availability.

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