[SWI_2P] On/off switch with adjustable switch-on and switch-off point

Function block SWI_2P generates a binary output signal based on a comparison of the input signal and the switch-on and switch-off point.

SWI_2P generates a binary output signal based on a comparison of the input signal and the switch-on and switch-off point.

Functioning

SWI_2P generates the binary output signal [Out] based on a comparison of the input signal [In] and the switch-on point [SwiOnPt] and the switch-off point [SwiOffPt].

Enabling and disabling the function

The function can be enabled/disabled via [EnFnct].

Direction of control action

The relative mutual position of the switch-on point [SwiOnPt] and the switch-off point [SwiOffPt] defines the direction of control action.

Direct

Reverse

Pins

Input	Description	Data type	Default value Value range
EnFnct	Enable function Enables the function.	Boolean	1
EnFnct	0 - The function is disabled. 1 - The function is enabled.
In	Input	Real	0.0
SwiOnPt	Switch-on point	Real	0.0
SwiOnPt	The direction of control action is direct if [SwiOnPt] ≥ [SwiOffPt]. The direction of control action is reverse if [SwiOnPt] < [SwiOffPt].
SwiOffPt	Switch-off point	Real	0.0
SwiOffPt	The direction of control action is direct if [SwiOnPt] ≥ [SwiOffPt]. The direction of control action is reverse if [SwiOnPt] < [SwiOffPt].

Output	Description	Data type	Default value Value range
Out	Output	Boolean	0
Out	0 - No 1 - Yes

Application

Heating and cooling control to disable (add or remove) components.
Execution of switching functions with known and settable switch-on and switch-off point.

If a setpoint with any settable position relative to the switch-on and switch-off point for two-position switches/controllers is a known or adjustable variable, SWI_2PH is used.

Process response

SWI_2P is processed starting with the first process cycle using the values pending at the inputs. If value [In] is between the switch-on and switch-off point during start-up, the output is set to [Out] = Off.