High/low (hardware) limit checking is provided for each analog input. These limits 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.

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