GE IS220PPROH1A Protection Module: Mark VIe Series

Technical Dossier

Product Details And Specifications

GE IS220P Series Technical Notes

The GE IS220P series is a core component family within the Mark VIe Distributed Control System (DCS), GE's flagship turbine and plant control platform deployed across heavy industrial sectors including petrochemical refineries, nuclear power stations, combined-cycle gas turbine (CCGT) plants, and offshore oil and gas facilities. The Mark VIe platform, of which the IS220P series forms a critical I/O and protection layer, is installed on tens of thousands of gas turbines, steam turbines, and generators worldwide. The IS220PPROH1A specifically functions as a protection I/O module, interfacing with the PPRO protection processor to execute overspeed, flame detection, and emergency shutdown logic in real time. Its role in safety-critical loops makes it one of the most frequently maintained and replaced modules in the Mark VIe ecosystem.

The Evolution of IS220P Architecture

The IS220P series was introduced as part of GE's transition from the Mark VI (IS200 series) to the Mark VIe architecture in the early 2000s. The Mark VI platform used VME-bus backplane communication and required separate I/O terminal boards; the Mark VIe redesign consolidated I/O processing onto dedicated IS220P-series boards with integrated IONET Ethernet communication, eliminating single-point backplane failures. Early IS220P revisions (H1A, H1B) established the physical form factor — a 3U eurocard with a 96-pin DIN41612 connector — that has remained consistent across the product lifecycle, ensuring backward compatibility within the same I/O pack assembly. By the mid-2010s, GE transitioned newer installations toward the Mark VIeS (Safety) variant, which introduced IEC 61508 SIL 2 certification for select modules. The IS220P series entered a mature/sustaining lifecycle phase circa 2018; GE no longer actively markets these modules for new installations but continues to supply them as spare parts through its Parts & Repairs division. For operators running Mark VIe systems with 10–20-year maintenance horizons, sourcing IS220P modules from qualified third-party distributors is the standard long-term maintenance strategy.

IS220P Full Catalog & Functionalities (SKU List)

The following SKUs represent the verified IS220P series module range, classified by functional category. Each module is a discrete field-replaceable unit (FRU) within the Mark VIe I/O pack assembly.

Protection & Safety I/O

• IS220PPROH1A: Protection I/O module; interfaces with PPRO processor for overspeed and ESD logic.
• IS220PPROH1B: Revised protection I/O module; improved EMI shielding over H1A revision.
• IS220PPROS1A: SIL-rated protection I/O module for Mark VIeS safety system configurations.

Analog Input Modules

• IS220PAICH1A: 16-channel analog input module; 4–20 mA / 0–10 V configurable per channel.
• IS220PAICH1B: Revised analog input module; extended common-mode rejection ratio.
• IS220PTCCH1A: Thermocouple input module; supports J, K, T, E, R, S, B type thermocouples.
• IS220PRTDH1A: RTD input module; 2-, 3-, and 4-wire PT100/PT1000 configurations.

Analog Output Modules

• IS220PAOAH1A: 8-channel analog output module; 4–20 mA current loop output.
• IS220PAOAH1B: Revised analog output; added output open-circuit detection.

Digital Input Modules

• IS220PDIAH1A: 24-channel digital input module; 24 VDC / 125 VDC selectable input voltage.
• IS220PDIAH1B: Revised digital input module; enhanced surge protection on all channels.
• IS220PVIBH1A: Vibration monitor input module; Bently Nevada-compatible proximity probe interface.

Digital Output Modules

• IS220PDOAH1A: 24-channel digital output module; solid-state relay outputs, 24 VDC.
• IS220PDOAH1B: Revised digital output; increased per-channel current rating to 500 mA.

Communication & Processor Modules

• IS220PSCAH1A: Serial communication adapter; RS-232/RS-485 interface for legacy device integration.
• IS220PHVAH1A: High-voltage analog input module; direct 0–300 V AC/DC measurement.
• IS220PTURH1A: Turbine speed input module; magnetic pickup and proximity probe inputs for speed sensing.