Twilight Switch
The Twilight Switch basically a 2-point-controller, which is defined by a setpoint value and a hysteresis, as well as the control-direction. The switching values are located half a hysteresis above and below the Basic Switching Value, which can be adjusted by an offset: the switching value-shift. The Control direction (Switch on if...) lets the user decide, if the controller is turning its output to true exceeding the upper switch point, or reaching below the lower setpoint:
Settings
Parameters
- Basic Switching Value: Setpoint value of the twilight-switch. Can be adjusted by an offset, the Switching Value Shift, see Online-menu.
- Control Hysteresis: Switching-hysteresis around the Basic Switching Value, see diagrams above.
- Control direction: Behavior of the twilight-switch:
- Switch-on if Undershoot: the lamps are turned on when the measured value is below the lower switching-value.
- Switch-on if Overshoot: the lamps are turned on when the measured value exceeds the upper switching-value.
- Switch-on delay / Switch-off delay: An additional time-hysteresis can be defined by these parameters.
- Switch-on level: Light-level, when the twilight-switch turns the assigned lamps on.
- Toggle Mode: If you use the Toggle Mode via "On / Off command of the functional unit", the lamp / lamp group toggles between the resetting value of the functional unit and "off".
If you use the Toggle Mode via "On / Off command of the local value", the lamp / lamp group toggles between the resetting value(s) of the lamp(s) and "off". - Initialization Mode: This option lets the user decide, what the assigned lamps do, when the twilight-switch is started initially, and the measured value is within the hysteresis.
- Step Size of the Switching Value Shift command: Refers to the Online-menu, where the Switching Value Shift can be increased/decreased by step Up/Down-buttons. This defines the step size.
- Minimal / Maximal value of the Switching Value Shift: The max/min value of Switching Value Shift.
Sensors / Actuators
In this menu you can enter the lamp / lamp group and the weather station with the light sonsors.
Online
Commands
- Fade Up: This command will increase the light value of all assigned lamps by their entered fade-rate. The command will only work when the lamp is already turned on. Increasing the value above the maximum level is not possible.
- Fade Down: This command decreases the light value by the entered fade-rate but will not let a lamp turn off completely.
- On: Turns the assigned lamps either to the maximum or the Resetting Value, which depends on the fact, if the Resetting Mode is activated or not. The Resetting Mode can be activated for each lamp separately.
- Off: Turns the assigned lamps off. When the Resetting Mode is activated the light value prior to the off state will be stored.
- Call Maximum Control Value: Each lamp will be turned to its maximum level.
- Call Minimum Control Value: Each lamp will be turned to its minimum level.
- Off ↔ Resetting Value: The switching direction depends on the average value of the lamp (group). If the value is greater than 0 all lamps will be turned off. When the value is equal to 0 all lamps will be either turned to their Resetting Value or to their maximum value, when the Resetting Mode is not activated at the lamp.
- Off ↔ Max Control Value: The same as Off ↔ Resetting Value but all lamps will be toggled between off and their maximum value.
- Set Control Value Direct: The entered value will be taken over to the lamps, when the Apply-button is pressed. If the entered value is greater than the maximum value of one of the lamps, the lamp will be set to its maximum level. If it is lower than its minimum level, but not 0, the lamp will be set to its minimum level. Entering and applying a 0 will turn the lamps off.
- Set Switching Value Shift Direct: Field to enter the Switching Value Shift either directly in a textbox or stepping up and down with the entered step size (see Settings-menu). The value is, however, delimited by the maximum and minimum value in the settings-menu.
- Regulator Enable/Disable: Sets the twilight-switch in automatic/manual mode. When the PLC is started, the regulator is enabled.
All Input functions are only possible, when the regulator is disabled, except changing the Switching Value Shift and of course the control Enable/Disable-functions.
State
- Average Control Value: Average value of all active (non-erroneous) lamps.
- Actual Value: Measured light level.
- Switching Value Shift: Actual Switching Value Shift.
- Switching Value: Actual Switching Value resulting from the Basic Switching Value and the Switching Value Shift.
- Resetting Value: When the functional unit is turned off, the previous light level will be stored in this variable. If you have selected the entry "Toggle via On/Off command of the Functional Unit" as "Toggle Mode", the lamps in the functional unit are set to this value, when they are switched on with the command Off ↔ Resetting Value and the Resetting Mode of the lamp is deactivated.
State PLC Module
- Execution State: Shows if the module is running or stopped.
- Error: In case of an error, the error code and the error parameter are displayed in this box.
- Start/Stop: Starts/stops the module.