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Siemens Building Technologies CM2N8894E 10.1999

Landis & Staefa Division 1/4

894

VISONIK

BPS control functions

Function sheet

From the onset of building automation, controllers have been an integral part of

the application functions. Earlier, individual devices were used; today, software

blocks are often used in automation stations. This function sheet describes the

structure of these blocks in the VISONIK BPS and the various control functions.

The following illustration shows supply air control with a fixed setpoint. In the VISONIK

BPS, the conventional controller has been replaced by two I/O modules (MW, STU)

and one controller block (RGB1):

.COU

.SPV

.PRV

.KREG

.KINT

= 13.3

= 27

= 26.1

= 4

= 0.25

26.1

13.3

Output

Input

STU

$ 053.AO

$ 020.AI

RGB1

Positioning

variable y

Setpoint w

Actual value x

8894Z01E

The controller blocks RGBn represent virtual data points in the BPS's process image.

Each of the max. 254 controller blocks contains the associated functions and process

variables in the form of software parameters. The table below contains a few examples

from the above illustration:

Designation Description

$ 020.AI

Analog input of address $020 (point type MW, measured value module)

$ 053.AO

Analog output of address $053 (point type STU, positioning command

module)

RGB1 .COU

Controller output variable/positioning variable; here: 13.3

.PRV

Control variable/actual value; here: 26.1

.SPV

Controller setpoint; here: 27

.KREG

Controller amplification (proportional amplification); here: 4

.KINT Integral portion (integral action); here: 0.25

Use

Explanations

(illustration)

Summary of content (4 pages)

PAGE 1
8 894 VISONIK® BPS control functions Function sheet From the onset of building automation, controllers have been an integral part of the application functions. Earlier, individual devices were used; today, software blocks are often used in automation stations. This function sheet describes the structure of these blocks in the VISONIK BPS and the various control functions. Use The following illustration shows supply air control with a fixed setpoint.
PAGE 2
Individual controller RGB The RGB controller block contains an individual controller with positioning output and various additional functions.
PAGE 3
Complex controllers SEQ and STR The VISONIK BPS has the following two complex controllers: SEQ sequence controller Sequence controllers SEQ allow for creating the following controls through combination with RGB controller blocks: − SEQ sequence controller − STR adaptive controller Sequence Cascade/sequence °C °C °C w x RGB x w RGB w RGB Features STR adaptive controller RGB 8894Z03 y RGB w x 8894Z04 Below is a list of the primary features of the two control types: Control Features Pr
PAGE 4
Overview of control functions Functions In the VISONIK BPS, the control functions can roughly be distinguished as follows: − Functions implemented in the BPS − Procedures loaded into the BPS via the plant operating program The following table provides a list of functions.