User Manual

CM2N8882en / 02.2000 Siemens Building Technologies
4/8 Landis & Staefa Division
Counting points are digital input information points. Any status changes directly result
from the processes in the building services system.
Counting points are also referred to as counter value points or counter input (CI) points.
Counting points have transmitters in the plant supplying a pulse sequence to the
automation station. In this regard, each pulse is proportional to a specific volume of a
physical variable or quantity.
In VISONIK, counter value modules acquire the pulses sent by the transmitter. They then
count the pulses and save them temporarily.
The VISONIK BPS cyclically polls the module for the counter status via the P-bus, adds
the value to the existing count and converts the pulses to the related physical variable
(e.g., 100 pulses = 1 kWh).
The maximum counter value of the BPS is 10
36
.
15
1
87
VISONIK BPS
2
Counter value module
bidirectional
data line
Counting points
in the plant
P-bus
Communication
partner
Preparation
Processing
8882Z04E
Depending on the programming, pulses may trigger the following functions in VISONIK:
Function Example
Reports Point status report
Alarming local and/or central Counter value limit violations
Acquisition of external synchronisation pulses Synchronisation of the measured period of
the maximum demand program is active
Switching of consumers on load
monitoring/peak load monitoring
Electricity and gas consumption: Rules
during the measured period/limitation on
reaching Emax.
Indication of counter status and
corresponding energy consumption
Within the measuring period: Daily
maximum today/ Daily maximum yesterday
Calculation using measured and/or other
counter values
Energy assessment tasks
Transfer of information to various
communication partners
See "Transfer of module point information",
page 7.
For applications using measured period synchronisation, an additional signalling module
is required as the input for the synchronisation pulse.
Counting points
Definition
Design
Counter value module
processing
Functions
Note