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2.
It then sequentially poles the I2C bus of each slot to determine if that slot is occupied
o
If that slot responds to the I2C, the inventory for that slot has the module type added, the alarm for this slot is active
o
If that slot does not respond, the inventory for that slot is marked as empty, the alarm for this slot is masked (inactive)
3.
Unintelligent module slots
don’t have I2C bus connections they have their alarm status checked to determine presence.
o
If that slot has a okay status, the alarm for this slot is active
o
If that slot has an active alarm, the alarm for this slot is masked (inactive)
NOTE: Unintelligent slots default to alarm active when unfitted
4.
Only active alarms are reported
After power up the module will also run periodic inventory updates to check if new modules are added
2.4.2
User configuration DIP switches, load resistors SW5
This function is provided to ensure that when redundant power supplies are used, there is enough current for both power supplies to be
active. The module can provide a maximum load of 12 watts load, this load can be switched in 3 watt steps
Load
0 / 3 / 6 / 9/ 12 watts switched
Control
via switch selection, using four DIP switches, see section 2.4
Setting*
(3U rack only) 1 or 2 modules fitted all four switches ON
(3U rack only) 3 or 4 modules fitted three switches ON
(3U rack only) 5 or 6 modules fitted two switches ON
(3U rack only) 7 or 8 modules fitted one switch ON
(3U rack only) 9 or more modules fitted, set all to OFF
(1U rack only) set all switches OFF
* These calculations assume the lowest possible power consumption to meet the minimum load specification, a more accurate calculation
can be made by using the modules datasheets or handbooks.
Note: There is no minimum load requirement for a 1U rack, in this case all load resistors should be OFF
SW5
Name
OFF
ON
Position 1
Load 1
Load resistor OFF
Load resistor ON
Position 2
Load 2
Load resistor OFF
Load resistor ON
Position 3
Load 3
Load resistor OFF
Load resistor ON
Position 4
Load 4
Load resistor OFF
Load resistor ON
The
ViaLiteHD
Summary alarm module module may have hot surfaces when operating under full load. Suitable precaution should be taken
when handling this device, see safety instructions