Three-point controller L/U

This function block implements a three-point controller.

Inputs
FU	Enable AU	Enable output AU. The output is enabled when 1 is present at the input. This input is optional; if the input is not connected, the output is automatically enabled.
FO	Enable AO	Enable output AO. The output is enabled when 1 is present at the input. This input is optional; if the input is not connected, the output is automatically enabled.
IW	Actual value	Actual value
SU	Setpoint lower	Setpoint lower. If the actual value falls below this limit value, output AU is switched on.
SO	Setpoint upper	Setpoint upper. If the actual value exceeds this limit value, output AO is switched on.
Outputs
AU	Manipulated variable lower	Description
AO	Manipulated variable upper
ST	Temperature fault
Parameters
	Control time	Control time in seconds. The setpoint / actual value comparison is only performed at this interval.
	Temperature monitoring minimum	Optional temperature monitoring. If the actual value falls below this limit, the output ST Temperature fault is set to 1 and the outputs are switched off. If both limit values are 0, the monitoring is not active.
	Temperature monitoring maximum	Optional temperature monitoring. If the actual value exceeds this limit, the output ST Temperature fault is set to 1 and the outputs are switched off. If both limit values are 0, the monitoring is not active.

Inputs