The relationship between the Present Value of an object and the physical state of the object is determined by the Polarity attribute.
The table below describes this relationship as defined by BACnet standards. Johnson Controls Polarity is always Normal. Johnson Controls N2 protocol does not support changes to the Polarity attribute.
|
Present Value |
Polarity |
Physical State of the Hardware Input |
Physical State of the Monitored Device |
|---|---|---|---|
|
Inactive |
Normal |
Off or Inactive |
not running |
|
Active |
Normal |
On or Active |
running |
|
Inactive |
Reverse |
On or Active |
not running |
|
Active |
Reverse |
Off or Inactive |
running |