Point Database
Siemens Building Technologies, Inc.
17
3
Point Database
Chapter 3 presents a description of the Fume Hood Controller point database including point
descriptors, point addresses, and a listing of applications in which each point is found.
Address Descriptor
Description
01
CTLR ADDRESS
Identifies the controller on the FLN trunk. Valid values: 0 through 98.
02
APPLICATION
The identification number of the Application running in the controller.
05
LOW ALM
This point displays an ON or OFF status. When the exhaust flow goes below the
value specified at LOW ALM LMT for the time specified in ALARM TIME, the
point goes into an alarm state (ON); the red LED is illuminated, the alarm
sounds, and the message “
FLOW LOW
” displays at the ODP.
06
HIGH ALM
This point displays an ON or OFF status. When the exhaust flow goes above the
value specified at HI ALM LMT for the item specified in ALARM TIME, the point
goes into an alarm state (ON); the red LED is illuminated, the alarm sounds, and
the message “
FLOW HI
“ displays at the ODP.
07
EMER ALM
This point displays an ON or OFF status that indicates if the EMERGENCY
PURGE button on the ODP has been pressed. When the operator presses the
EMERGENCY PURGE button, the point is ON, the red LED is illuminated, the
alarm sounds, and
EEE
and
EMERGENCY MODE
display at the ODP. If pressed
again, then the point is OFF. This point can be commanded by a field panel.
08
GEN FAILURE
Indicates a hardware failure (e.g., the pressure sensor) with an ON or OFF
status. The red LED is illuminated; the alarm sounds, and
FFF
and
GENERAL
FAILURE
display at the ODP.
10
HI ALM LMT
The value above FLOW STPT, in percent, at which the red LED and audible
alarm are activated on the ODP. This point is the setpoint for HIGH ALM. Valid
values: 100 through 255%.
11
HI WARN LMT
The value above FLOW STPT, in percent, at which the yellow LED is illuminated
on the ODP. Valid values: 100 through 255%.
12
LOW WARN LMT
The value below FLOW STPT, in percent, at which the yellow LED is illuminated
on the ODP. Valid values: 0 through 100%.
13
LOW ALM LMT
The value below FLOW STPT, in percent, at which the red LED and audible
alarm are activated on the ODP. This point is the setpoint for LOW ALM. Valid
values: 0 through 100%.
14
EMER TIMER
When EMER ALM is set to ON, the time set for EMER TIMER is used as the
length of time the EXH FLOW is commanded to full flow (the exhaust flow control
device is full open). After the time in EMER TIMER times out, the EXH FLOW is
controlled to the value set in EMER STPT. Valid values: 0 through 32, 767
seconds.
