Connection To The Master System (Lonworks Standard) - Remak VCS Installation And Operating Instructions Manual

Connection to the Master System (LonWorks Standard)

LonWorks Network
The VCS control unit enables integration of the centralized BMS (Building
Management System) using the LonWorks communication bus. Using
the suitably integrated system, it is possible to control the air-handling
device operating state. For a specific description of the variables to be
used for the integration, refer to the section "Description of Pre-defined
Variables in the LONWorks Network". The final functionality, monitoring
and control options will be dependant on the integrator used to ensure
connection to the master BMS system.
Network Interface
Connection to the network is ensured by a galvanically sepa-
rated FTT-10A transceiver. This Free Topology Transceiver has
been designed for the LonWorks network with a TP/FT-10 type
transmission channel. This transmission channel uses a free
topology network, a twisted pair and baud rate of 78 kbps.
Applicable network topologies to be used
along with the FTT-10A transceiver:
• Free topology
(including the star and circular topology)
– Free topology
• Bus topology
– Line (Bus) topology
Each device in the LonWorks network is identified by a unique neuron ID
identifier. The unique neuron ID identifier assigned by the manufacturer
can always be found on the Climatix controller which is a part of the
VCS control unit.
For more information on the LonWorks Standard refer to:
www.echelon.com
www.lonmark.org
Data Point Settings for Application of
Some Network Input Variables
Using the controllers along with the VCS control system, it is possible
to make changes in the assignment of the functions to some network
input variables (SNVT).
For some input variables like outdoor temperature and fire alarm (exter-
nal failure), it is necessary to select if the value is to be used from the
communication or from the application in the Controller Menu. Thus it can
be determined if the outdoor temperature sensor is connected directly
to the VCS control unit or its temperature reading is sent through the
communication (LonWorks).
Description of Pre-defined
Variables in the LonWorks Network
This section includes description of SNVT variables (Standard Network
Variable Types) according to assigned REMAK data points. The list below
includes specifications of variables for all the VCS control system vari-
ants. For example, if the VCS control system (air-handling device) was
not equipped with gas heating it is not possible to use these variables.
Input Variables
Network Variable:
Description:
70
nviTemps
Req. heating temperature (Comfort)
Req. cooling temperature (Comfort)
Req. heating temperature (Economy)
Req. cooling temperature (Economy)
Minimum supply air temperature
Maximum supply air temperature
Object: SNVT_temp_Setpt
Remark: Structured Variable
Network Variable: nviTemp01
Description: Not used
Object: SNVT_temp_p
Network Variable: nviTemp02
Description: Outdoor temperature
Object: SNVT_temp_p
Network Variable: nviAHum00
Description: Humidification Reference Value
Object: SNVT_abs_humid
Remark: For absolute and relative
Network Variable: nviAHum01
Description: Dehumidification Reference Value
Object: SNVT_abs_humid
Remark: For absolute and relative
Network Variable: nviPpm00
Description: Air quality Reference Value
Object: SNVT_count
Network Variable: nviPress_Flow00
Description: Not used
Object: SNVT_count
Network Variable: nviPress_Flow01
Description: Not used
Object: SNVT_count
Network Variable: nviPress_Flow02
Description: Not used
Object: SNVT_count
Network Variable: nviPress_Flow03
Description: Not used
Object: SNVT_count
Network Variable: nviPress_Flow04
Description: Not used
Object: SNVT_count
Network Variable: nviPress_Flow05
Description: Not used
Object: SNVT_count
Network Variable: nviResetAlarm
Description: Failure reset
Object: SNVT_switch
Values:
0
1
>1
State: 0:
Normal
Reset
Not defined
Inactive