GE IS215 Series Modules | IS215VCMIH2C VME Communication Interface

Technical Dossier

Product Details And Specifications

GE IS215 Series: Comprehensive Module Range and Technical Overview

The GE IS215 series represents the core I/O and communication module family within GE's Mark VI Turbine Control System — one of the most widely deployed Distributed Control Systems (DCS) in global heavy industry. Installed across gas turbine power plants, combined-cycle facilities, nuclear auxiliary systems, petrochemical refineries, and offshore platforms, the IS215 platform has accumulated decades of field-proven reliability in environments demanding continuous uptime and deterministic control response.

The Mark VI system, of which IS215 modules form the backbone, is estimated to be active in thousands of installations worldwide. Its modular VMEbus architecture allows for granular replacement and maintenance without full system shutdown — a critical factor in industries where unplanned outages carry costs measured in millions per hour. The IS215VCMIH2C specifically serves as the VME Communication Interface, managing backplane data routing between the controller and I/O modules.

The Evolution of IS215 Architecture

The IS215 series was introduced alongside the Mark VI platform in the mid-1990s as GE Power's successor to the Mark V control system. The architecture is built on the VMEbus (Versa Module Europa) standard — a robust, backplane-based communication protocol originally developed for military and aerospace applications, later adopted widely in industrial control.

Early Generation (Mark VI, ~1995–2005): Initial IS215 modules used parallel VMEbus communication with dedicated I/O racks. Redundancy was achieved through triple-modular redundancy (TMR) configurations using three independent I/O packs voting on outputs. Modules such as the IS215VCMIH2A and IS215VCMIH2B were the primary communication interfaces in this era.

Mid Generation (Mark VI, ~2005–2015): Revised board revisions (Rev C, Rev D) introduced improved FPGA logic, enhanced EMI shielding, and extended temperature tolerance. The IS215VCMIH2C (this listing) belongs to this generation. Firmware compatibility was maintained across revisions, allowing mixed-revision installations in the same rack.

Modern Transition (Mark VIe, ~2012–present): GE introduced the Mark VIe platform with Ethernet-based I/O (IONET) replacing VMEbus for new installations. IS215 modules are not directly compatible with Mark VIe racks, creating a permanent installed base of legacy IS215 hardware requiring long-term spare parts support. GE has formally classified many IS215 modules as Last Time Buy (LTB) or End of Life (EOL), making third-party sourcing essential for continued operations.

IS215 Full Catalog & Functionalities (SKU List)

The following SKUs represent the primary module types within the IS215 series, organized by functional category. All models listed are confirmed components of the GE Mark VI / IS215 platform.

Communication & VME Interface Modules

IS215VCMIH2C: VME communication interface, Rev C, primary backplane data routing module for Mark VI racks.
IS215VCMIH2B: VME communication interface, Rev B, predecessor to H2C with identical form factor.
IS215VCMIH2A: VME communication interface, Rev A, earliest production revision, limited firmware support.
IS215VCMIH1B: Single-slot VME comm interface variant, used in compact Mark VI configurations.

Analog Input (AI) Modules

IS215AEPAH1A: Analog input module, 16-channel, 4–20 mA / 0–10 V, used for process variable monitoring.
IS215AEPAH1B: Analog input module, Rev B, enhanced noise rejection for high-EMI environments.
IS215AEAAH1A: Analog input module, thermocouple/RTD inputs, temperature measurement in turbine exhaust systems.

Digital Input (DI) Modules

IS215DTURH2A: Digital turbine control I/O module, handles discrete inputs from proximity probes and limit switches.
IS215DTURH2B: Digital turbine I/O, Rev B, expanded diagnostic LED indicators.
IS215DTBCH1A: Digital input terminal board interface, bridges field wiring to VME backplane.

Digital Output (DO) Modules

IS215UCVEH2A: Universal controller/output module, manages relay and discrete output signals to actuators.
IS215UCVEH2B: Universal controller/output, Rev B, improved output driver protection circuitry.

Power Supply Modules

IS215PSVIH1A: Power supply interface module, conditions and distributes 28 VDC to IS215 rack modules.
IS215PSVIH1B: Power supply interface, Rev B, added over-voltage protection relay.

CPU / Controller Modules

IS215UCVGH2A: Mark VI main controller module, executes turbine control logic and coordinates I/O voting.
IS215UCVGH2B: Main controller, Rev B, increased onboard RAM and faster scan cycle support.

Sourcing Hard-to-Find & Obsolete IS215 Parts

As GE has transitioned its installed base toward the Mark VIe platform, IS215 series modules have progressively moved through Last Time Buy (LTB) status into full End of Life (EOL) classification. OEM channel availability is effectively closed for most IS215 SKUs. Plants operating Mark VI systems — particularly those with 15–30 year operational horizons common in nuclear auxiliary, refinery, and baseload power applications — require a reliable third-party supply chain for these components.

DriveKNMS maintains a dedicated inventory of IS215 series modules sourced from decommissioned Mark VI systems, authorized surplus channels, and controlled refurbishment programs. Our procurement team actively tracks IS215 module availability across global industrial surplus markets, enabling us to fulfill both single-unit emergency replacements and bulk spare parts orders for planned maintenance outages.

For obsolete revisions (Rev A, Rev B) where firmware compatibility with existing systems is required, DriveKNMS provides revision-specific sourcing to prevent incompatibility issues during hot-swap replacements. All modules are supplied with full traceability documentation.

Quality Control for the IS215 Range

IS215 modules present specific testing challenges due to their VMEbus backplane communication architecture and multi-board assembly construction. Standard bench power-up testing is insufficient to validate communication interface modules such as the IS215VCMIH2C — functional verification requires active backplane communication simulation.

DriveKNMS applies the following test protocol to all IS215 modules prior to shipment:

Visual Inspection: Component-level inspection of PCB for corrosion, burnt components, cracked solder joints, and damaged connectors. IS215 modules are particularly susceptible to electrolytic capacitor degradation in high-temperature installations.
Backplane Communication Test: Modules are installed in a live Mark VI test rack and subjected to active VMEbus communication cycles. Data integrity across all backplane slots is verified against GE baseline specifications.
I/O Channel Verification: For I/O modules, all input and output channels are individually stimulated and measured. Channel-to-channel isolation is tested to confirm no cross-talk or leakage.
Firmware Version Confirmation: Onboard firmware revision is read and documented. Customers are notified of firmware version prior to shipment to confirm compatibility with their existing system configuration.
Burn-In Cycle: Modules are operated under load for a minimum of 24 hours to screen for early-life component failures before shipment.