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ZT 7102 Chassis Management Module
Sensor Types
Technical Product Specification 65
10.0 Sensor Types
The CMM provides access to and can log events from different IPMI sensor types. These sensors
can be threshold based sensors or discrete sensors, depending on the type of reading and events
they generate. For more information on sensors and sensor types, refer to the Intelligent Platform
Management Interface Specification v1.5.
10.1 Threshold-Based Sensors
Threshold based sensors are sensors that generate or change an event status based on comparing a
current value to a threshold value for a given hardware monitor device. Examples of threshold
based sensors are temperature, voltage, and fan tachometer sensors.
10.1.1 Threshold-Based Sensor Events
Threshold-based sensors generate events when a current value for a device becomes greater than or
less than a given threshold value. The IPMI specification defines six thresholds that can be
assigned to a given sensor. The sensor will generate an event when its current reading goes above
or below any of these thresholds. The severity of the event generated depends on which threshold is
crossed. These six thresholds and their associated event severity are as follows:
Upper non-recoverable---> Critical Event
Upper critical--->Major Event
Upper non-critical--->Minor Event
Lower non-critical--->Minor Event
Lower critical--->Major Event
Lower non-recoverable--->Critical Event
10.2 Discrete Sensors
Discrete sensors are sensors that have a predefined set of states. An examples of a discrete sensor
would be board presence, where a board is either present or not present.
10.2.1 Discrete Sensor Events
Discrete sensors can generate events on state changes. The severity of the event is determined by
the CMM. Discrete sensor events for the CMM are located in the next section, Chapter 11.0,
“Health Event Strings”.