Two-point regulator
Last updated
Last updated
The principle of the two-point regulator is illustrated in Fig.
The function of two-point regulator.
Increasing the current value provided by "Actual-AIN" above the limit set by "Required-AIN", incremented by a positive hysteresis value labeled "Hysteresis +", triggers the digital output "Required-DOUT" to switch to "ON" (logical 1).
Decreasing the current value provided by "Actual-AIN" below the limit set by "Required-AIN", decremented by a negative hysteresis value labeled "Hysteresis -", causes the digital output "Required-DOUT" to switch to "OFF" (logical 0).
Select the "Device manager" > Add "New unit "> Select the central unit > Add "New unit">Select the "Regulators-Module".
Add “Regulators-Module”, with a fixed hexadecimal address value of “010051”. The system can store only one module of this type.
Then, add a "Two-Point-Regulator" (refer to Fig. a ). The system allows for a maximum of 256 regulators.
Enable-DIN: Digital input responsible for initiating regulator control by setting the device state to "ON" using the function call "Digital – On".
Actual-AIN: Analog input responsible for processing the current value of the selected quantity, such as temperature, provided by a function call like "Analog – copy" from a temperature input or controller.
Required-AIN: Analog input responsible for processing the required value of the selected quantity, such as temperature, provided by a function call like "Analog – copy" from a controller or system integer. The value stored in the system integer is divided by 100 during copying.
Interrupt-DIN: Digital input responsible for interrupting the regulator function by setting the device state to "OFF", thereby turning off the output "Required-DOUT".
Required-DOUT: Digital output connectable to an actuator, such as a relay.
Status-OUT: Output state generating actions further in the system:
"Status ON": Regulator is turned on.
"Status OFF": Regulator is turned off.
"Status error actual": Input "Actual-AIN" encountered an error.
"Status end error actual": Error of "Actual-AIN" disappeared.
"Status error required 1": Input "Required-AIN" encountered an error.
"Status end error required 1": Error of "Required-AIN" disappeared.
"Status interrupt": Regulator has been stopped by input "Interrupt-DIN".
"Status end interrupt": Regulator function has been restored after interrupting by input "Interrupt-DIN".
Address: Hexadecimal address of the unit related to the regulator – the value must not collide with any other existing one.
Name: Allows the user to define some description or the name of the unit.
The two-point regulator contains the following online parameters accessible by clicking on the sub-tab "Online parameters" and then clicking on the pencil icon in the top-right corner of the Device Manager (refer to Fig.):
Hysteresis -: Value represented as the range deducted from the current value of the measured quantity while the current value is decreasing. The value distinguishes a step of 0.01(i.e. 25.81, 25.82, etc.).
Hysteresis +: Value represented as the range added to the current value of the measured quantity while the current value is increasing. The value also distinguishes a step of 0.01(i.e. 25.81, 25.82, etc.).
Buttons "v" (green tick) or "x" (red cross) can be used to confirm or cancel the definition of "Online parameters".
