BACnet_BI

The Binary Input object type (WinCC OA datapoint type) defines a standardized object whose properties represent the externally visible characteristics of a binary input. A "binary input" is a physical device or hardware input that can be in only one of two distinct states. In this description, those states are referred to as ACTIVE and INACTIVE. A typical use of a binary input is to indicate whether a particular piece of mechanical equipment, such as a fan or pump, is running or idle. The state ACTIVE corresponds to the situation where the equipment is on or running, and INACTIVE corresponds to the situation where the equipment is off or idle (Polarity = NORMAL).

In some applications, it may happen that these logical states are reversed on the application-level (Polarity = REVERSE).

Datapoint Type Name

BACnet_BI

(Object/)Datapoint Type Structure

DP_Name.property

Datapoint Element (Property) Data Type Device-depending availability Description
Present_Value unsigned integer No

This property reflects the logical state of the Binary Input. The logical state of the Input can be either INACTIVE or ACTIVE. The relationship between the Present_Value and the physical state of the Input is determined by the Polarity property.

The possible states are summarized as follows:

Relation PSoD

PV = I

P = N

PSoI = OFF or I

 not running

PV = A

P = N

PSoI = ON or A

 running

PV = I

P = R

PSoI = ON or A

 not running

PV = A

P = R

PSoI = OFF or I

 running

PV = Present_Value

P = Polarity

PSoI = Physical State of Input

PSoD = Physical State of Device

A = ACTIVE

I = INACTIVE

N = NORMAL

R = REVERSE

Faceplate

Figure 1. Faceplate of "Simple_BI"

The state of Present_Value that is shown in the faceplate has the following meaning: green = ACTIVE (1) and gray = INACTIVE (0). When the hand mode is activated, the present state can be changed directly in the faceplate. For more details, see Value Input Panel.

Tabs

For more information on tabs, see Tabs.

Available Symbol Types

Name Usage $ Parameter Symbols
Simple_BI State display in terms of color (e.g. operating state, interruption or alert) DP
Mini_BI State display in terms of color (e.g. operating state, interruption or alert) DP
Flashlight_blue Flashing lamp (blue) DP
Flashlight_red Flashing lamp (red) DP
Flashlight_orange Flashing lamp (orange) DP
Fire_Detector Fire detector DP
Door_1 Door DP