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EXCEL 10 FCU CONTROLLER LNS PLUG-INS USER GUIDE
47 EN2B-0285GE51 R0909
Table C3. Input Variables for Excel 10 FCU Controllers
NV name field name
engineering units:
English (metric) or states plus
range
digital
state
or
value
default comments
nviApplicMode SNVT_hvac_mode
HVAC_AUTO
HVAC_HEAT
HVAC_COOL
HVAC_OFF
HVAC_NUL
0
1
3
6
255
HVAC_AUTO
(if bound but fails to be
received or at application
restart)
This input variable coordinates the controller operation with the
main equipment controller. Depending upon the available supply
energy, the main equipment controller commands the Fan Coil
Unit controller to operate in heat mode only, cool mode only or
heat and cool mode if appropriate to the configuration.
HVAC_AUTO means that both heating and cooling equipment are
available, and the current mode is determined by the control
algorithm depending upon the room temperature and effective
setpoint. HVAC_AUTO is invalid for changeover applications.
When the Digital input is configured for Heat/Cool changeover
input, this input will always have priority over the network
nviApplicMode’s HVAC_HEAT or HVAC_COOL.
nviDlcShed BYTE
NORMAL
SETPOINT_SHIFT
0
1
0 (if bound but fails to be
received or at application
restart)
This input variable is from an energy management system. When
it is 0, the temperature control algorithm operates in a normal
mode. When it is 1, the effective setpoint will be shifted by the
amount defined in nciEmergyManag.si_dlc_setpt_bump. For
cooling the effective setpoint will be increased, for heating the
effective setpoint will be decreased always with regard to the frost
protection limit.
nviEmerg SNVT_hvac_emerg
EMERG_NORMAL
EMERG_PRESSURIZE
EMERG_DEPRESSURIZE
EMERG_PURGE
EMERG_SHUTDOWN
EMERG_NUL
0
1
2
3
4
255
EMERG_NORMAL
(at application restart)
This input variable is an emergency input from a device that
determines the correct action during a given emergency (such as
a fire).
• EMERG_NORMAL, EMERG_NUL: terminate EMERG_
commands and restores the control algorithm.
• EMERG_PRESSURIZE, EMERG_PURGE,
EMERG_SHUTDOWN: heat/cool outputs OFF, fan ON at
highest speed.
• EMERG_DEPRESSURIZE: heat/cool outputs OFF, fan OFF.
nviFanSpeedCmd value SNVT_switch
0 to 100%
100%
(at application restart)
This input variable allows control of the fan speed by another
node, such as another Fan Coil Unit Controller acting as a master
in a master/slave relationship.
nviFanSpeedCmd state SNVT_switch
OFF
ON
NUL
0
1
255
NUL
(at application restart)
See above.
nviInUse UWORD
0 to 65535
0 (if bound but fails to be
received), 65535 ( for 60s
at application restart)
This input variable is used by the engineering tool or other
supervisory node that it is "logged on" to the controller node. It
should be set every minute, or the controller will reset it after 60s
to automatically log off the supervisory node.