User Manual

Siemens Building Technologies CM2N8884E / 10.1999
Landis & Staefa Division 3/6
The VISONIK BPS communicates with the building services systems by means of the
process bus, short P-bus:
T
T
8884Z03E
I/O modules
P-Bus
BPS
I/O modules
The communication elements and functions on the process level are:
Element Description/Function
P-bus The P-bus is a proprietary data bus of Landis & Staefa. It has been
designed as a control cabinet bus and, in its standard version (max. 50
m), consists of a 3-pin round cable.
This bus connects the VISONIK BPS with the I/O modules.
The VISONIK BPS per default has a P-bus connection at terminal block I
(excepting station type PRV2.00).
I/O modules The I/O modules are connected to the building services systems by
means of field wiring. They convert the VISONIK BPS's uniform signal to
the various signals for the plant components and vice versa.
The VISONIK PBS cyclically transfers the data via the P-bus.
Further information on the P-bus as well as process level communications is available
in the following documents:
Document no. Title
CM2N8301E Building Process Station, overview
CM2N8022E Process bus, data sheet
The following table provides an overview of the VISONIK BPS communication
interfaces:
Port Interface Connection for….
COM1 TTY1/V.24 Modem or local operation (main interface)
TTY2/V.24 Printer or local operation (secondary interface)
BLN SDLC ring
COM2 FLN/MONOGYR FLN bus or MONOGYR bus
Tool TTY3/V.24 PC with VISOTOOL Editor (via tool adapter)
Third-party system couplings are made via an interface on COM1, whereby the
interface can be configured to TTY1 or TTY2. The VISONIK BPS then serves as a CFE
device (
C
ommunication
F
ront
E
nd). Communication occurs by imaging the data points
of the third-party system as VISONIK data points. Each third-party system coupling is
an individual coupling. Below are two examples for third-party system couplings.
Process level
P-bus
Elements and
functions
Additional information
BPS interfaces
Third-party system
couplings