Core Functions

Analog signal termination and filtering

I/O signal distribution and routing

COREBUS bus connection and termination

4–20 mA output signal conversion

IONET signal transmission between control and I/O boards

Connector Configuration

COREBUS connectors: 2 × JAI / JAJ

Vertical pin cable connectors: 5

Vertical pin plug connectors: 2

Serial interface: 1 × 9-pin male connector

Terminal blocks: 2 × double-layer terminal blocks

Key Interfaces

JA: 4–20 mA output interface to the TCCA board

8PL: IONET interface to the STCA board

J28 / J29: Overspeed trip signal interfaces

Electrical Specifications

Power supply: +5 VDC, 6 A

Ground impedance: 75 Ω

Supported analog signals:

4–20 mA

0–10 V

Signal Transfer & Protection

Transfers 4–20 mA output signals from the TCCA board

Routes IONET signals from the STCA board

Incorporates MOVs and resistor networks for surge suppression and noise attenuation

Bus Architecture & Redundancy

JAI and JAJ connect directly to the COREBUS

Terminal resistors must be installed when COREBUS ports are unused

Supports dual-redundant and TMR (Triple Modular Redundancy) system architectures to enhance reliability and availability

Fault Location & Diagnostics

Onboard status indication enables rapid operational assessment

Standard current-limiting components assist in quick identification of wiring and signal faults

System Integration

Serves as the central signal hub of the core area (R5)

Interconnects control boards with I/O modules

Significantly simplifies system wiring, commissioning, and long-term maintenance