User Manual

CM2N8882en / 02.2000 Siemens Building Technologies
2/8 Landis & Staefa Division
Signalling points are digital input information points. Any status changes directly result
from the processes in the building services system.
Signalling points are also referred to as digital input (DI) points.
On the building services system side, the signalling points correspond to the contacts of
field devices such as thermostats, flow monitors, level monitors, etc. They supply the
binary input information 0 or 1 to the automation station.
The signals from the signalling points, i.e., the status changes of the contacts are
recorded in VISONIK by the signalling modules. The VISONIK BPS cyclically polls the
signalling modules via the P-bus and processes the information in accordance with the
associated program.
1
2
VISONIK BPS
8882Z02E
bidirectional
data line
Signalling points
in the plant
P-bus
Communication
partner
Preparation
Processing
Si
g
nallin
g
module
Depending on the programming, information contained in the signalling points may
trigger the following functions in VISONIK:
Function Example
Reports Single point report "Frost alarm"
Automatic calling Any fault messages
Status change counting Fault statistics or analysis
Status time counting Operating hours count
Logical links to several signalling points Process controls
Start or stop COLBAS tasks Programmed in reaction task (TSK253),
caused by a signalling point status
change
Transfer of information to various
communication partners
See "Transfer of module point
information", page 7.
Signalling points
Definition
Design
Signalling module
processing
Functions