Metasys TC-9100 Series - Page 35

Technical Bulletin—TC-9100 Universal Controller 35
Algorithm 12: Equation 3
Output (OCM) = [K2 × (I1+K3) × (I2+K4) × (I3+K5) + A] × B
(If an input is not connected, the corresponding value
In will assume a
default value of 1.)
In all of the above equations, the variables
A and B are determined as
follows:
A=0 if Conditioning Logic Variable 1 = 0
A=K6 if Conditioning Logic Variable 1 = 1
B=1 if Conditioning Logic Variable 2 = 0
B=K7 if Conditioning Logic Variable 2 = 1
The “Conditioning Logic Variable” can be any one of the logic modes in
the controller:
•
Window Open
•
Occupancy
•
Air Quality/Override
•
Reverse Action
•
General Alarm
•
Low Limit
This feature allows the digital inputs (DI1 and DI2) to the controller (or
Low Limit mode) to have an influence on the operation of the controller.
For example, a set point may be increased or decreased depending on an
override or alarm condition, as detected by digital input DI1 or DI2.