User Manual

CM2N8884E / 10.1999 Siemens Building Technologies
2/6 Landis & Staefa Division
The VISONIK BPS on the management level communicates via the Building Level
Network (BLN):
BPS
EKL-XPRV1
DCS
BPS
Insight
8884Z02E
Management station
The following elements are involved in the Building Level Network:
Element Description
Management
station
The management station in its simplest build contains a Data and
Communication Server (DCS) with Insight for graphical display and
operation, and a printer for alarms and reports.
BLN (SDLC) In VISONIK, the Building Level Network (BLN) is an SDLC ring. SDLC
stands for "Synchronous Data Link Control“ and denotes the type of
data transfer protocol.
Data transfer is event-oriented. As a result, process values of a BPS
can be made available to other stations and processed.
A maximum of 32 process stations can be connected to an SDLC ring
with DCS (BPS, PRV, EKL-X).
COM1 Communication card COM1 is used for connecting the VISONIK BPS
to the Building Level Network (order separately).
The Building Level Network assumes the following two functions:
•
Data exchange between the management station and the individual process stations
(BPS, PRV, EKL-X)
•
Data exchange between the individual process stations
The process stations on the same SDLC ring can exchange data without a superposed
DCS (peer-to-peer communication). In this case, the BPS with the smallest address
assumes the task of communication master. This ensures data exchange between the
process stations.
Refer to the following documents for more information on the SDLC ring:
Document no. Title
CM2N8301E Building Process Station, overview
CM2N8311E Communication cards COM1, data sheet
CM2T8336E Information on the SDLC ring (expert document)
Management level
Building Level
Network
Involved elements
BLN functions
Vice master function
Additional information