User Manual

CM2N8887en / 26.02.01 Siemens Building Technologies
2/4 Landis & Staefa Division
The following diagram shows a simplified program structure in the BPS.
TSK 255
TSK n (1 .. 199)
PROC X
10 .........................................
20 .........................................
.. .........................................
.. .........................................
... .........................................
PROC Y
10 ......................
20 ......................
... ......................
TSK n (200 .. 255)
TSK 203
Header
.......................................
Program part
Variable table
....................
Variable table
........................................
........................................
Procedures
8887Z02en
Tasks
The program elements shown above are:
Element Explanation
General
information on
the task
A task (TSK) is an independent program unit in a COLBAS program.
Tasks can be:
– Individually generated, edited, and deleted.
– Processed parallel and independently from one another, and
started and stopped by other tasks.
– Exchanged among each other and with the process data.
Each COLBAS task contains the following parts:
– Header with the general task specifications and the variable
declaration.
– Program part with the individual instructions.
– Variable table with the task variables (current values).
TSK 1..199 Tasks freely available for the plant operating program, whereby
certain task numbers are intended for certain tasks such as:
– TSK 5 for plant coordination.
– TSK 10, TSK 20, TSK 30, etc. for the individual plants.
– TSK 160 for outputting local fault messages.
TSK 200..255 Tasks reserved for: Data exchange and reports, time switch
programs and catalogs, telephony, POP card operation, COLBAS
procedures (TSK 255).
These tasks are not accessible, with few exceptions such as: Basic
tasks TSK 201 .. 203 to operate the BPS using COLBAS
instructions in immediate mode via TTY1 .. TTY3.
Procedure A COLBAS procedure is an independent program unit with its own
table of variables. The COLBAS procedure library contains
procedures for a large number of routine tasks such as:
– Fan control.
– Control of recirculated air dampers.
– Room temperature cascade control for temperature or humidity.
– Fault message printouts.
– etc.
Procedures must be called by the superposed task.
Program structure
Process and
instrumentation
diagram
Program elements