IS230PCAAH1B combined core analysis Mark VI
The GE IS230PCAAH1B is a Core Analog (PCAA) I/O module engineered for the Speedtronic Mark VIe distributed control platform. As the central analog signal-processing component in a Mark VIe I/O pack, it acquires thermocouple, 4–20 mA, LVDT, seismic vibration, and pulse-rate inputs while delivering servo drive outputs for fuel valve and actuator control. The module operates within the Mark VIe network hierarchy, communicating with controllers over dual IONet Ethernet ports and supporting simplex, dual, and triple modular redundant (TMR) configurations.
Product Overview
In the Mark VIe architecture, I/O modules sit at the lowest tier of a layered Ethernet hierarchy. Field signals terminate at terminal boards, pass through I/O packs like the PCAA, and reach the controller over IONet—a dedicated 100 MB full-duplex network designed for deterministic I/O communication. The controller then exchanges data with HMIs and plant-level systems through higher layers such as Unit Data Highway (UDH) and Plant Data Highway (PDH).
The IS230PCAAH1B serves as the analog processing center within this structure. It is not a field-replaceable sub-component at the board level: the module integrates application I/O boards, a processor board, and terminal board connectivity into a single replaceable assembly.
Key Specifications
Parameter Value
Series Mark VIe
Module Type: Core Analog I/O (PCAA)
Analog Inputs: 25 isolated channels
Supported Input Signals: Thermocouple, 4–20 mA, 0–10 VDC, LVDT excitation, seismic/vibration, pulse frequency
Accuracy (0–10 VDC) ±0.50%
LVDT Excitation Monitor Accuracy ±1.00%
Servo Driver Output Accuracy ±3.50%
Communication: Dual RJ45 IONet Ethernet ports
Power Supply 28 VDC ±5%
Operating Temperature −30°C to +65°C
Dimensions 33.02 cm H × 17.8 cm W
Compatible Terminal Boards: TCAS, TCAT
Redundancy Support: Simplex, Dual, TMR
Functional Capabilities
Unified Analog Acquisition. A single PCAA module consolidates signal types that would otherwise require multiple dedicated cards. Thermocouples for exhaust and bearing temperature monitoring, 4–20 mA loops for pressure and flow transmitters, LVDT inputs for valve position feedback, seismic sensors for vibration protection, and pulse-rate signals for speed measurement all route through the same module. This density reduces cabinet footprint and spare-part inventory complexity.
Signal Fan-Out with TCAT. The companion TCAT terminal board enables signal distribution from a single set of field sensors to one, two, or three PCAA modules. In TMR configurations, three PCAA modules process identical input signals in parallel, with the controller performing voting to reject a single module fault without triggering a spurious trip. The PCAA also supports direct field wiring through its own terminals for signals that do not require fan-out.
Servo and Excitation Outputs. Beyond input acquisition, the module provides LVDT excitation and servo coil drive outputs for fuel valves, inlet guide vanes, and other actuated components. Dedicated accuracy specifications apply to each output class: ±1.00% for LVDT excitation monitoring and ±3.50% for servo driver outputs.
IONet Communication. Dual RJ45 ports connect the module to the Mark VIe IONet backbone. In dual-connected configurations, ENET1 typically ties to the R controller network while ENET2 serves the S network. The module negotiates communication over either port, and a single IONet connection is sufficient for simplex operation. IONet itself is a 100 MB full-duplex Ethernet network with IEEE 1588 time synchronization, supporting deterministic I/O cycles.
Application Context
The IS230PCAAH1B is deployed across gas turbine, steam turbine, and combined-cycle control cabinets where comprehensive analog monitoring and servo control are required. Typical installations include:
Combustion and exhaust monitoring: thermocouple inputs for exhaust spread and blade path temperature
Fuel control: LVDT feedback and servo outputs for gas control valves and IGV positioning
Protection systems: seismic vibration inputs and speed signals routed into trip logic
Balance-of-plant: 4–20 mA loops for auxiliary pressure, flow, and level transmitters
Because the module supports simplex through TMR configurations with the same hardware, it is equally applicable to non-critical auxiliary loops and to critical protection circuits requiring triple redundancy.
