Three point controller Hysteresis

This function block is used to implement a three-point controller. This controller has a setpoint with adjustable hysteresis instead of on/off limits.

Inputs
FU	Enable AU	Enable Output AU. The output is enabled when input 1 is present. This input is optional, if the input is not connected, the output is automatically released.
FO	Enable AO	Enable Output AO. The output is enabled when input 1 is present. This input is optional, if the input is not connected, the output is automatically enabled.
IW	Actual value	Actual value
SW	Setpoint	Setpoint. If the Actual value falls below the setpoint minus hysteresis, Output Bottom is switched on, if the Actual value exceeds the setpoint plus hysteresis, Output Top is switched on.
HY	Hysteresis	Hysteresis. Half of the hysteresis acts on the switching threshold at the top and half on the bottom.
Outputs
A1	Output	Output

Parameter
Regulation time		Regulation time in seconds. The target/actual comparison is only executed in this interval.
Temperature monitoring Minimum		Optional temperature monitoring. If the actual value falls below this limit, the output ST fault temperature is set to 1 and the outputs are switched off. If both limit values are 0, 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, monitoring is not active.

See also general parameters of all function blocks.