This IS215VCMIH2C is designed as a VME communication card in the GE Mark VI turbine control system and is critical to the proper function of the entire system.

The VCMI VME communication board allows the input/output (I/O) card to communicate with other I/O cards mounted on the VME backplane, I/O mounted in the expansion rack,

I/O backup protection modules, triple-redundant control modules, and the main processor module or main processor modules.

The IS215VCMIH2C card is also broadly referred to as the VMEbus master controller. This PCB connects the communication between the I/O boards and the controller.

It also acts as the communication interface to the system control network (IONet).

The IS215VCMIH2C has four built-in port connections placed on its front panel.

These include an RS-232C serial port, D-plug connector, and three IONet 10Base2 Ethernet ports.

Each IONet connector is associated with three LEDs labelled TX/RX/CD.

The board has additional LEDs labelled Status, Fail, Run and 1. 2. 4 and 8.

The former is located above the reset switch (button) and the latter is located directly below the serial port.

Each control module in a Mark VI system typically contains an IS215VCMIH2C, these unique VCMI cards are used to execute data through the control system’s application software in communication with the main processor module.

Due to the critical nature of the VCMI modules, it is recommended that additional spares are kept on the shelf to avoid machine downtime situations.