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Control units VCS
List and Description of Basic Data Points
Connection to the Master System (BacNet Standard)
BACnet/IP (BMS)
e VCS control unit enables integration of the centralized
BMS (Building Management System) using the BACnet/IP
communication standard. Using a suitably integrated mas-
ter system, it is possible to control the air-handling device's
operating state.
Generally
BACnet is a standard communication protocol for Building
Automation and Control Networks developed by ASHRAE
(American Society of Heating, Refrigerating and Air-condition-
ing Engineers). e main goal was to create a protocol which
enables the integration of systems from different manufactur-
ers intended for building automation. For detailed information
on the BACnet protocol, refer to the following websites:
www.bacnet.org
www.bacnetinternational.net
BACnet/IP Protocol
ere are several variants of the BACnet protocol. e VCS
control system uses BACnet/IP for the Ethernet network.
The BACnet communication protocol works using the
Master/Slave principle. e Server function is used for VCS
unit system communication with the master system. is
means that the VCS control unit behaves like a Server in the
communication.
Protocol settings can be performed using one of the follow-
ing controllers: HMI, DM, TM or Web. Switching on and off,
restart and other settings of the BACnet server can be carried
out through the web page (calling the address set in the VCS
control unit). For detailed information on the BACnet/IP Stand-
ard (EDE file and others) settings and application, refer to the
Siemens BACnet/IP Communication Module documentation
available on the REMAK website.
e following table includes a list of basic data points which
can be used for this communication and their description.
e list includes specifications of variables for different VCS
control system variants.
For example, if the VCS control system (air-handling device)
has not been equipped with gas heating, it will not be possible
to use these variables. e final functionality, monitoring and
control options will be dependent on the integrator used to
ensure connection to the master BMS system.
Data point name Meaning
Device Device
Diagnostic Diagnostics
SystemClock System time
AirQuality Air quality
RoomTmp Room temperature
RmUTmp1 HMI-SG1
RmUTmp2 HMI-SG2
ValidRoomTmp Temperature in the room aer control
ReturnAirTmp Outlet air temperature
SupplyTmp Inlet air temperature
OutTmp Outdoor temperature
HtgFrstTmp Return water temperature (water heater)
ExhaustTmp Outlet air temperature aer the heat exchanger
PreElHtgTmp Temperature, electric pre-heating
PreWtrHtgTmp Return water temperature (water pre-heating)
BrnrFlueTmp Flue gas temperature
RoomHum Air humidity in the room - relative
SupplyHum Inlet air humidity - relative
OutHum Outdoor air humidity - relative
RmHumAbs Absolute air humidity in the room
SplyHumAbs Absolute inlet air humidity
OutHumAbs Absolute outdoor air humidity
RmEnth e room - enthalpy
OutEnth Outdoor enthalpy
ActOpMode Current state of the device
ActFanStep Current state of the fans
OpModeAutoManSt.Swtch Manual mode (control)
OpModeAutoManStTmp.Swtch Manual mode (control)
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