GE IS220UCSAH1A TMR main controller module

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GE IS220UCSAH1A – What it is

IS220UCSAH1A is the “super-brain” of GE’s Mark VIe / Mark VIeS safety-rated control family—a Triple-Modular-Redundant (TMR) main-controller pack.
Located in the controller rack, it executes real-time control algorithms, protection logic and communication management for gas / steam turbines and delivers SIL 3 functional safety through three-way voting.

Key data

Highlights

1. Native TMR: three modules run and vote in parallel—single failure does not affect outputs

2. Deterministic: millisecond loop times for speed control, anti-surge, load sharing

3. On-line self-check: CPU, memory, comms and I/O continuously monitored; hot-swap keeps MTTR low

4. Multi-protocol: Modbus-TCP, EtherNet/IP, IEC 61850 built-in for easy DCS/SCADA/IT integration

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