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Siemens Standard application AHU CE1P3977en_02
Building Technologies Detail pages: Inputs and outputs 01.02.2010
6.5.3 Special information
• Read: Levels 6, 4 and 2.
• Write: Read only.
Parameter Range Function
BACnet present
Value
Depends on hardware. Present value on BACnet. Value is frozen for an
alarm.
Value selector
– Hardware
– Comm
– Average
– Minimum
– Maximum.
– PreferedHW
– PrefComm
Displays valid input value for the application:
– Value on hardware input.
– Value from communications.
– Average from values on the hardware input and
communications. An alarm is triggered when one of
the two values are invalid (if enabled).
– Lowest value from the values on hardware input
and from communications. Alarm triggers (if en-
abled), if one of the two values is invalid.
– Highest value from the values on hardware input
and from communications. Alarm triggers (if en-
abled), if one of the two values is invalid.
– Value on hardware input has priority. The value
from communications assumed if invalid. Alarm
triggers (if enabled), if both values are invalid.
– Value from communications has priority. The value
from hardware input assumed if invalid. Alarm trig-
gers (if enabled), if both values are invalid.
Value HW Depends on hardware. Present value for hardware.
Value comm Depends on hardware. Present value from communications.
Reliability HW Depends on hardware. Present reliability of hardware value.
Reliability comm Depends on hardware. Present reliability of value from communications.
Disable OffNormal
– Passive
– Active
The OffNormal alarm is disabled. Example: A value
greater than the high limit does not trigger an alarm:
– Alarm is triggered.
– Alarm is not triggered.
ToOffNormal Day of week, dd.mm.yyyy
hh:mm:ss
Date and time the last off normal alarm occurred.
ToFault Day of week, dd.mm.yyyy
hh:mm:ss
Data and time last fault alarm (Reliability <> 0) oc-
curred.
ToNormal Day of week, dd.mm.yyyy
hh:mm:ss
Date and time last alarm was reset.
Access level
Parameter
Basis Document Siemens Climatix Control System
BDCX.100820.01GB
Page 105
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