June 2018
Legrand PDU User Guide 121
Managed vs Unmanaged Sensors/Actuators
To manually manage or unmanage/release a sensor or actuator, see Peripherals (on page 116).
Managed sensors/actuators:
Legrand PDU communicates with managed sensors/actuators and retrieves their data.
Managed sensors/actuators are always listed on the Peripheral Devices page no matter they are
physically connected or not.
They have an ID number as illustrated below.
They show one of the managed states. See Sensor/Actuator States (on page 121).
For managed
'numeric' sensors, their readings are retrieved and displayed. If any numeric sensor is
disconnected or its reading cannot be retrieved, it shows "unavailable" for its reading.
Unmanaged sensors/actuators:
Legrand PDU does NOT communicate with unmanaged sensors/actuators so their data is not retrieved.
Unmanaged sensors/actuators are listed only when they are physically connected to Legrand PDU.
They disappear when they are no longer connected.
They do not have an ID number.
They show the "unmanaged" state.
Sensor/Actuator States
An environmental sensor or actuator shows its real-time state after being managed.
Available sensor states depend on the sensor type -- numeric or state sensors. For example, a contact
closure sensor is a state sensor so it switches between three states only -- unavailable, alarmed and normal.
Sensors will be highlighted in yellow or red when they enter abnormal states. See Yellow- or
Red-Highlighted Sensors (on page 120).
An actuato
r'
s state is marked in red when it is turned on.
Managed sensor states:
In the following table, "R" represents any numeric sensor's reading. The symbol <= means "smaller than" or
"equal to."
State Description
normal
For numeric sensors, it means the
readings are within the normal range.
For state sensors, it means they enter the
normal state.
below lower critical "R" < Lower Critical threshold
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