User Manual

CM2N8896en / 26.02.01 Siemens Building Technologies
2/2 Landis & Staefa Division
In the VISONIK BPS, the I/O points have special parameters in which monitoring
functions are activated or certain limit values set.
BPS
etc.
LOL
FBERSTA
OH...
$015
0 .. 15 .......... ..... .....
>0
!!!
8896Z02
.....
HIL
<1
I/O
Examples of these types of parameters, their functions, and possible reactions are:
Parameter Functions / possible reactions
Feedback
FB
Switching command points with feedback are monitored to see if the
feedback is received within the defined time. If this is not the case,
further switching may be blocked, a plant switched off, etc.
Limit value
HIL/LOL
If the limit values are exceeded at measurement or counter value
points, alarms may be triggered, safety functions started, plant
elements turned on or off, etc.
Operating
hours
OH...
For signaling points and switching command points, the operating
hours are cumulated with certain point states (OFF/ON, Stage 1, etc.).
When a limit value has been reached, reports on the operating hours,
maintenance messages, etc. can be triggered.
Fault state
ERSTA
ERSTA has a value of 0, if the I/O point is not faulty, and 1 ..15 if there
is a fault. The value provides information on the cause of the fault and
its priority.
ERSTA changes start reactions (if programmed).
Tasks are program units in the VISONIK BPS used to implement the various plant and
system functions. User-specific monitoring functions can be programmed in special
tasks such as peak demand limiting and power restoration.
The VISONIK BPS operating system monitors power restoration. The behavior of the
BPS itself is defined by parameters. The startup of the assigned plants can be
programmed in TSK 254. The sequence in the event of a power restoration (default) is:
1. All tasks are stopped after which TSK 254 is started.
2. TSK 254 starts the other tasks according to the programmed instructions, for
example those for step-by-step restart of the plants.
The superposed VISONIK DCS usually carries out the peak demand limiting function.
However, if necessary, the VISONIK BPS can monitor and control consumption of
electrical energy of the building services systems connected.
This takes place via the LSP peak demand limiting program whose tasks are
programmed according to the required functions.
The VISONIK BPS operating system and the plant operating program are continuously
subjected to internal system tests. This way, the correct functioning of hardware and
software and the I/O modules is constantly monitored.
Appropriate error messages are output when system faults occur. The operator is
warned and can take measures to maintain plant operation, for example, manually.
The monitoring functions are an integral part of the VISONIK BPS. Also refer to
function sheet N8895.
Also see sheet N8888 “BPS reports” for further information.
Functions
Point-specific
functions
Examples
Functions with tasks
Power restoration task
TSK 254
Peak demand limiting
System monitoring
Note
Additional information
 2001 Siemens Building Technologies Ltd.