Siemens BACnet ATEC Owner's Manual page 28

Chapter 3 – Point Database
Descriptor Address
FLOW
CTL FLOW MIN
CTL FLOW MAX
CTL TEMP
CLG LOOPOUT
HTG LOOPOUT
AVG HEAT OUT
STAGE MAX
STAGE FAN
STAGE MIN
DMPR STATUS
SWITCH LIMIT
SWITCH TIME
STAGE COUNT
VALVE COUNT
STAGE TIME
28
Siemens Industry, Inc.
125-5050, Rev. AA
Application
1
except
{75} All 2597
2
except
{76} All 2597
2
except
{77} All 2597
{78} All except 2597
except
{79} All 2597
except
{80} All 2560, 2597
{81} 2562, 2564, 2566
2
82 2562, 2564, 2566
83 2565, 2567
83 2562, 2564, 2566
{84} 2560, 2561, 2562,
2
2563
except
85 All
2560, 2561, 2597
except
86 All
2560, 2561, 2597
88 2562, 2564, 2566
88 2563
89 2562, 2564, 2566
Description
Indicates the amount of air currently passing the air velocity
sensor. The value is calculated as a percentage based on
where the value of AIR VOLUME is in the range between 0
and CTL FLOW MAX.
The active minimum flow used as a limit for the flow control
loop. This value is the same as CLG FLOW MIN if the
controller is in cooling mode, or is the same as HTG FLOW
MIN if the controller is in heating mode, unless it is overridden.
The active maximum flow used as a limit for the flow control
loop. This value is the same as CLG FLOW MAX if the
controller is in cooling mode, or is the same as HTG FLOW
MAX if the controller is in heating mode unless, it is
overridden.
The temperature used as input for the temperature control
loops. This value is the same as the value in ROOM TEMP
and RM TEMP OFFSET unless it is overridden.
The cooling temperature control loop output value in percent.
The heating temperature control loop output value in percent.
This point is used to determine what stages of electric heat
are used for a given loop output value. The ranges for the
value are determined by the number of stages used: 0 to 100
for 1 stage of electric heat, 0 to 200 for 2 stages of electric
heat, and 0 to 300 for 3 stages of electric heat.
With electric heat, this value is equal to: HTG LOOPOUT ×
STAGE COUNT.
The value, in percent, which the heating loop must exceed for
the electric heat to be ON for the full duty cycle (STAGE
TIME).
The valve must be opened greater than this value before the
fan will turn ON.
The value, in percent, which the heating loop must go below
for the electric heat to be OFF for the full duty cycle (STAGE
TIME).
This point is used only when CAL MODULE set to YES. It
readjusts the damper position if the command value is not
equal to the actual position of the damper. CAL indicates that
the damper is operating normally. RECAL indicates that the
damper position was adjusted (recalibrated) by 25% because
the desired airflow was not obtainable under its current status.
The active temperature control loop output must be less than
this value to switch between cooling mode and heating mode.
Actual switchover depends on SWITCH DBAND being
exceeded and is subject to SWITCH TIME being expired.
The time, in minutes, before the heat/cool mode can change
over when the other parameters are appropriate.
The number of electric heating stages used by the application.
DOs associated with unused stages may be used as spare
DOs.
The number of heating valves available.
The cycle time in minutes for the electric reheat stages. For
example, if there are three stages of electric heat and STAGE
TIME = 10 minutes, STAGE COUNT = 3, and AVG HEAT
OUT = 150% then, Stage 1 is ON for 10 minutes (100% of the
time), Stage 2 is ON for 5 minutes (50% of 10 minutes) and
BACnet ATEC Owner's Manaul
4/20/2010