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Characteristics when configuring
Observe the Control and regulate basics.
Control and regulate
In engineering, quantities can be both controlled and regulated.
When controlling, a quantity is manipulated without being able to compensate for outside influences.
When regulating, a quantity is maintained at a specific value in order to compensate for outside
influences.
In the following example, controlling means that the person can set the heat output at a fixed value. The
heater cannot compensate for the drop in room temperature when a window is opened.
In the example below, regulating means that the person can increase the heat output if the room
temperature drops to below 20 °C. If the room temperature rises above 20 °C, the heat output is
reduced.
Basic concepts of regulating
In the example, the current for the electric heating is the manipulated variable. The changeable
resistance is the actuator. The hand that operates the actuator is the control. The actual room
temperature is the controlled variable or the process value. The desired room temperature is the
command variable or the setpoint value. The electric heating is the control process. The thermometer is
the sensor. The temperature loss from opening the window is the disturbance variable.
So this means that the person measures the process value (room temperature) with the sensor
(thermometer), compares the process value (room temperature) with the command variable (desired
room temperature) and uses the actuator (changeable resistance) to manually regulate the manipulated
variable (heating current), in order to compensate for the disturbance variable (temperature drop from
opening the window). The person is therefore the controller.
Summary of Contents for ELC-12AC-R-N
Page 1: ...Applied to ELC PR series Ver 3 0 Programmable Relay User s Manual Rievtech Electronic Co Ltd...
Page 27: ...27 PR 14 and PR 18 series 1 PR 18 CPU 2 PR E extension PR 24 series...
Page 31: ...31 AC type digital inputs Analog Inputs DC 0 10V Analog inputs current Inputs 0 20mA...
Page 40: ...40...
Page 120: ...120 C Analog input value of CPU and extensions D Analog output value of CPU and extensions...
Page 121: ...121 E F digital flag status F AF analog flag value...
Page 122: ...122 G M status H AM value...
Page 221: ...221 7 Click Install button to install Program is being installed...
Page 250: ...250...
Page 256: ...256 You can read the parameters from the PLC...
Page 258: ...258...
Page 267: ...267 TCP Sever 192 168 0 227 port 8004 is ok TCP Sever 192 168 0 227 port 8005 is ok...
Page 268: ...268 TCP Sever 192 168 0 227 port 8006 is ok TCP Sever 192 168 0 227 port 8007 is ok...
Page 269: ...269 TCP Sever 192 168 0 227 port 8008 is ok TCP Sever 192 168 0 227 port 8009 is ok...
Page 290: ...290 Slave1 IP 192 168 0 101 TCP server port 8001 Slave2 IP 192 168 0 102 TCP server port 8002...
Page 317: ...317 Network settings You can view the network parameters in such table...
Page 331: ...331 B005 Read the I1 IA status from the slave1 to the F11 F20 of the master Setting as follows...
Page 332: ...332 B006 Read the I1 IA status from the slave2 to the F21 F30 of the master Setting as follows...
Page 346: ...346 7 4 2 The scheme of xLogic The circuit diagram of industry gate...
Page 353: ...353 7 6 2 The scheme of xLogic Components K1 main contactor...
Page 357: ...357 4 cursors Cursor key Type 1x MODBUS code 02 C1 C4 256 259 BIT R...
Page 392: ...392...