GE Energy Mark* VIe Control Product Description

are not configurable, and are selected to be outside the normal operating range but 

inside the linear hardware operational range (before the hardware reaches saturation). 

Diagnostic messages for hardware limit checks and all other hardware diagnostics 

for the board can be accessed with the software maintenance tools. A composite 

diagnostic alarm state is provided in the database for each I/O pack, and a separate 

logic state is provided to indicate a high/low (hardware) limit fault of any analog 

input or the associated communications for that signal. 

Diagnostic and system (process) alarms are time-stamped in the controller(s) and 

transmitted to operator and maintenance stations. Communication links to a plantdistributed control system (DCS) can contain both the software (system) diagnostics 

and composite hardware diagnostics. 

Diagnostic LEDs are provided on I/O packs as previously shown for the Analog I/O 

pack. Standard LEDs indicate: power status, attention (abnormality detected), 

Ethernet link connected, and Ethernet link communicating. LEDs on discrete I/O 

packs also indicate the status of each point. All boards feature an electronic ID that 

contains the board name, revision, and a unique serial number. When power is 

applied to the I/O processor, it reads the ID of the terminal board, application board, 

and itself. It then uses this information for a start permissive, diagnostics, and system 

asset management. Since the terminal boards can be mounted remote at the 

equipment, local temperature sensors monitor the temperature at each I/O pack. 

Excessive temperature causes an alarm message. The alarm state and current 

temperature value are available for display and for use in the application software

Plant level control systems integrate the diagnostic data from the individual turbine 

and generator controls with the overall plant. This allows maintenance personnel to 

quickly identify the defective control node, switch, or station and locate the 

particular device needing service.

Network Diagnostics for:

z Operator Stations

z Maintenance Stations

z Engineers Stations

z Switches on:

- Plant Data Highway

- Unit Data Highway

- IONet

z Control Nodes

- Boards Within Nodes

- I/O Packs