TST Thermostat Control Algorithm

The Thermostat Control Algorithm (TST) function block implements a simple ON/OFF type thermostat control algorithm. 

TST definition parameters

Parameter Description
Name Function block name, see common parameters
DYN dynamic option, see common parameters
/ Mixed inputs option, see common parameters
Input The measured value or (process value) that is to be controlled.
Set Point The target value (set point) that the control block is striving to attain.
Deadband On/Off If the error value is less than this value the control will not change its output. This can help prevent unnecessary cycling. There are two separate parameters which are applied depending on whether the output would be going ON or going OFF.
Hysteresis Specifies the accumulate time require before the output changes from off to on or on to off. This would eliminate relay chatter for noisy inputs for example. Optionally expressed in hours, minutes or seconds via radio buttons
/ Toggle button between Reverse and Direct mode (push to switch between modes):
- In Reverse mode, the TST responds when the input is below the set-point , heating application for example.
- In Direct mode, the TST responds when the input is above the set-point, cooling application for example.
This parameter can also be dynamically controlled by another block in the MBus_ioFlash program.
/ Normal/Invert output option, see common parameters