GE Speedtronic MKVI Modules IS200EMIOH1A

Technical Dossier

Product Details And Specifications

GE Speedtronic MKVI Series Technical Notes

The Evolution of Speedtronic MKVI Architecture

GE's Speedtronic turbine control lineage spans six generations. The MKI through MKIV systems used analog and relay-based logic. The MKV (introduced early 1990s) was the first fully digital platform, using VME-bus architecture and proprietary I/O boards. The MKVI (introduced late 1990s, widely deployed 2000–2015) replaced VME with a dedicated IONet Ethernet-based I/O network, enabling distributed I/O placement closer to field devices. Key architectural advances include triple-redundant processor voting (TMR – Triple Modular Redundancy), hot-swappable I/O modules, and integrated diagnostics via the HMI ToolboxST software suite.

Compatibility note: MKVI boards are not backward-compatible with MKV racks. The MKVI-e (enhanced) variant introduced around 2008 added expanded memory and faster scan rates but retained the same physical form factor and IONet protocol, allowing mixed deployment in some configurations. As of 2020, GE has transitioned new installations to the Mark VIe platform. The MKVI is now in its extended lifecycle phase, with OEM support limited. Third-party suppliers such as DriveKNMS provide the primary sourcing channel for replacement modules.

Speedtronic MKVI Full Catalog & Functionalities (SKU List)

Processor & Controller Modules

• IS200EPDMG1A: Dual-redundant processor module, primary control core for MKVI TMR systems.
• IS200EPDMG1B: Revised processor module with expanded flash memory, drop-in replacement for G1A.
• IS200EPSMG1A: Power supply module for processor rack, 28VDC regulated output.

Main I/O Modules

• IS200EMIOH1A: Main I/O board; interfaces analog/digital field signals to IONet bus; central hub for MKVI I/O rack.
• IS200EMIOH2A: Revised main I/O board with enhanced EMI shielding and extended temperature tolerance.
• IS200EAIAH1A: Analog input module; 16-channel, 4–20mA/0–10V configurable, 12-bit resolution.
• IS200EAIAH1B: Analog input module, revised calibration firmware, compatible with AIAH1A racks.
• IS200EAOAH1A: Analog output module; 8-channel, 4–20mA output for valve positioners and actuators.
• IS200EDCFH1A: Digital contact input module; 32-channel, 24VDC wet contact sensing.
• IS200EDCFH1B: Digital contact input module, extended voltage range 24–125VDC.
• IS200EDOEH1A: Digital output module; 16-channel relay output, 2A per channel, Form C contacts.

Communication & Network Modules

• IS200ENETG1A: IONet Ethernet communication adapter; primary network interface for MKVI I/O racks.
• IS200ENETG1B: Dual-port IONet adapter with redundant network path support.
• IS200EPDMG2A: Modbus/TCP gateway module for legacy DCS integration.

Speed & Vibration Modules

• IS200ESVOH1A: Speed and vibration I/O module; 8-channel magnetic pickup and proximity probe inputs.
• IS200ESVOH1B: Enhanced speed/vibration module with onboard signal conditioning for Bently Nevada probes.

Power Supply Modules

• IS200EPSMG2A: Redundant power supply module, dual-input 120/240VAC, 28VDC/10A output.
• IS200EPSMG3A: High-capacity power supply for expanded I/O racks, 28VDC/20A output.