User Manual

Siemens Building Technologies VISONIK DCS Functions and System Messages VVS18 CM2U8567E / 04.1999
Landis & Staefa Division Function PNT 2-223
2.24.4 Modifying parameters
By entering a parameter's abbreviated name, the user has direct access to the
corresponding parameter value, which can be modified within its range, depending on
the user's write privileges.
Data types
Every parameter is associated with a particular data type.
The VISONIK DCS supports the following data types:
•
Numerical parameters
•
Text parameters
•
Bitset parameters
•
Other data types
Example for CHPL: [ 80..132 ]
In this example, the DCS accepts numerical inputs in the range 80 to 132.
Example for MCOM: [ Off, On, Auto, Heating, Cooling, Comfort,,,,Night-V,
Emerg.Op, Frost, ExtFrost, InsFrost, Fire-1, Fire-0 ]
The DCS accepts both the text entries as shown above and the corresponding
numerical values described in the following.
These numerical values (ascending values starting from zero) correspond to the location
of the text within the defined range.
The following numerical values apply for the above example:
Off corresponds to the numerical value 0
On corresponds to the numerical value 1
Auto corresponds to the numerical value 2
Heating corresponds to the numerical value 3
.
Comfort corresponds to the numerical value 5
Night-V corresponds to the numerical value 9
.
Fire-0 corresponds to the numerical value 15
Unoccupied list positions (commas) must also be counted in order to determine the
corresponding numerical value of a text parameter (note the jump in values between
Comfort and Night-V in the above example).
PS and DCS COLBAS accept numerical values only.
The process station and COLBAS in the DCS do not accept text entries; the
corresponding numerical value must be entered in each case.
Numerical parameters
Text parameters
Important:
PS and DCS COLBAS