GE Mark VIe | IS420YDOAS1B | Discrete Output I/O Pack

The IS420YDOAS1B device is designed for General Electric’s Mark VIe Turbine Control System Series, a set of control systems used in wind, gas, and steam turbine automated drive assemblies. The Mark VIe series is known for being one of the last GE product lines to incorporate the company’s signature Speedtronic control system technology. It’s important to note that the IS420YDOAS1B is a revision of the original IS420YDOAS1 Discrete Output I/O Pack, offering updated features and performance.

Hardware Tips and Specifications

The Discrete Output I/O Pack IS420YDOAS1B provides electrical interfaces between up to two Ethernet input-output networks and a discrete output terminal board. The pack controls up to twelve relays and accepts feedback from the terminal board. Inputs are transmitted via dual Ethernet RJ45 connectors, along with a three-pin power input. Outputs are connected using a DC37 pin connector that links directly to the terminal board connectors.

For visual diagnostics, the IS420YDOAS1B pack is equipped with LED indicators on the front panel. Typically, the twelve LEDs will illuminate yellow to show that each output is energizing the corresponding relay. The BBPx processor LEDs also provide important diagnostic information. The ATTN LED is red or green and can either be solid or flashing. Specific patterns of the green ATTN LED include 2 Hz with 50% duty cycle and two 4 Hz pulses every four seconds, indicating the application is online and functioning correctly.

Common Diagnostic Alarms

The IS420YDOAS1B I/O pack may trigger a variety of diagnostic alarms during operation. For example, Alarm 5 indicates that the I/O pack is in remote I/O mode. Causes for this alarm may include hardware failure or an invalid module configuration. To resolve these issues, users may need to replace the I/O pack or module, or rebuild the system and reconfigure the I/O pack.

Additionally, the IS420YDOAS1B uses a special base printed circuit board (PCB) protective strategy, with a protective outer chassis around the internal circuitry for enhanced durability.

Technical Specifications