Glossary (Controllers)

A row | Ka row | Sa row | Ta row | Na row | Ha row | Ma row | Ya row | Ra row | Alphanumeric characters

A row

analog Signal	They are used for transmission signal output and remote signal input, and include 4 to 20 mA current signals and 1 to 5 V voltage signals.
Anti-reset Windup	A function that determines the effective range of I action (integral action) to prevent excessive I action and over when performing PID control.
event	A function that judges whether an alarm should be issued when the measured value (PV) exceeds the condition for generating an alarm or when an abnormality occurs in the controller itself or control object.
engineering port	A communication connection part for connecting to a PC and setting parameter of the controller.
Auto	A function that computation and automatically sets PID constant suitable for the control target when performing PID control.
On-off servo type	control specifications of the output. It is also called positional proportionality. control Select when the target is a device such as a control motor or a regulating valve that can set the rotation angle freely.
On/Off control	control output is control in two ways: on (output 100%) and off (output 0%) (also called two-position control). When the measured value (PV) is smaller than the set value (SV), control output is turned on, and when the PV is larger than the SV, the output is turned off.
On-off pulse type	control output specifications. Also called time proportional type. Select this when the control object is an electromagnetic switch or other device that control the time ratio of the control output on and off.
over	A state in which control of a controller temporarily exceeds the set value (SV) by a large amount.
Open Collector	A transistor that operates in the same way as a contact. Only DC load can be used.

K row

External contact input (DI)	control Remote operation of the controller, such as starting, stopping, etc. Connect a contact such as a relay or switch to an external signal input terminal and turn it on or off to operation
External contact output (DO)	contact signal (a contact) is output depending on the operating status, such as when the controller starts or stops operating.
Reference contact compensation (RJ)	A function that enables measurements to be made without an external reference contact compensator when a thermocouple is connected to the input terminal.
reference operating condition	Installation conditions to satisfy accuracy ratings listed in the catalog etc.
reverse operation	An operation to reduce output as the measured value (PV) increases and approaches the set value (SV). Used to control heating furnaces, etc.
alarm	An alarm is issued when the measured value (PV) of the controller exceeds the alarm setting value.
Alarm deadband	A function that prevents alarms from being activated and reset frequently when the measured value (PV) repeatedly increases and decreases.
Gradient Settings	A function that changes the set value (SV) by a fixed value per unit time instead of immediately changing it to the new value when the SV is changed.

S row

Sampling Period	Input signal capture interval
shunt resistor	resistance that is connected between the (+) and (-) input terminal when using a 4 to 20 mA DC current input signal. Some models have a built-in shunt resistor.
output limiter	A function to set the upper or lower limit higher limit value that can be output at control output (MV).
Output change limiter	A function that limits the amount of change in the control output (MV).
Manual output operation	A function to manually set the magnitude of the control output (MV).
scaling Function	A function that converts the transmission signal (4 to 20 mA, 1 to 5 V) input from a sensor or device into an actual quantity (pressure, flow rate, humidity, etc.) and display instead of display it as a raw value.
step	Used for control in which the set value (SV) is changed over time in a program controller. The required time and the set value (SV) after the time has elapsed are set in step, and a control pattern is configuration by combining multiple step.
Control Period	The time required to change the output value of control output (MV).
direct operation	As the measured value (PV) increases and approaches the set value (SV), control output ratio also increases. Used to control refrigerators, etc.
Accuracy ratings	The precision with which the input signal is taken in and converted into a numerical value.
Setting Value (Setting Value)	control target value
contact	current The function of the device is to conduct or interrupt the relays and switches. contact The different operations that a contact, b contact, and c contact have are divided into a , b , and c , respectively. From JIS C0617-7 "Electrical Graphic Symbols"
sensor compensation	A function that adds a correction value to the measured value (PV) obtained from the input signal and display it.
operation terminal	A device that operates by receiving the control output from a controller. It refers to thyristor regulators, control valves, etc.
Measurements (Process Variable)	The value read from the input signal
Measurement range	Select the range of the input signal to be measured.

Ta row

Adjustment Method	control output specifications. Select the type that suits the control target. On-off pulse type, on-off servo type, SSR drive pulse type, current output type, and voltage output type are available.
Communication features	A function to connect to a PC and set parameter of the controller from the PC (high-order communication). A function to transmit set values (SV), measured values (PV), output values (MV), etc. to external devices (our controllers) (communication transmission).
Communication transmission	A function to transmit set values (SV), measured values (PV), output values (MV), etc. to external devices (our controllers). Used when operating multiple controllers under the same conditions.
resistance load	control target such as heater
Voltage Output Type	control output specifications. Used when the control object is a thyristor regulator or inverter, etc.
transmission signal output (transmission output)	It outputs analog signal of 4 to 20 mA or 1 to 5 V to transmission settings, measurements, etc. to other devices.
current Output	control output specifications. Used when the control object is a thyristor regulator or inverter, etc.

Na row

Input Signal	This refers to signals from thermocouples, resistance thermometer, DC current, DC voltage signals, etc.
Input capture cycle	The interval at which the input signal is measured and captured (= sampling period).

Ha row

Burnout	This function prevents control output from becoming unstable when the sensor connected to the input terminal is disconnection. The measured value (PV) is made to swing to higher limit or lower limit limit of the measurement range, and control output becomes preset value.
Pulse Period	The time for one cycle to switch control output on and off with on-off pulse output type and SSR drive pulse type.
Heater disconnection detection	A function to detect when an electric heater connected to a control output is disconnection (a separate CT must be installed).
universal power supply	Power specifications: Supports 100 to 240V.
universal input	The measurement range can be selected from thermocouple, resistance thermometer, DC voltage, and DC current.

Ma row

Multi-range	There are models that allow you to select the measurement range from thermocouple, DC voltage, DC current, and models that allow you to select resistance thermometer.
MOS Relay Output	A type of semiconductor relay that can handle both DC and AC load. It operates in the same way as contact.

Ya row

inductive load	control objects such as coils and relays

Ra row

remote /local switching	This function allows you to select whether various settings are made using external analog signals (remote) or by key operation (local).
remote Communication Input	A function to change the set value (SV) using analog signal from an external device.

Alphanumeric

±1digit	Digit refers to the minimum number of digits in the input range. For example, if the input range is selected as 0.0 to 600.0°C, ±1 digit is ±0.1°C.
2-position control	control is performed by turning on and off only (=on-off control).
NO contact	contact This is one of the operating schemes of the "". Normally, contact opens and current does not flow, but when an alarm occurs, contact closes and current flows.
MV (Manipulated Value)	The magnitude of operation amount
PID constant	control parameter for PID control. Sets the proportional band for P action, the integral time for I action, and the derivative time for D action.
PID control	control calculates and control control output so that the difference between the measured value (PV) and set value (SV) of the controlled object becomes zero. control that combines P (proportional), I (integral), and D (differential) actions. P action control the magnitude of operation variable in proportion to the magnitude of the deviation between the measured value (PV) and set value (SV). I action control the magnitude of the manipulated variable in proportion to the area of the deviation between the measured value (PV) and set value (SV). D action control the magnitude of operation operation in proportion to the amount of change in the deviation between the measured value (PV) and set value (SV).
PV (Process Variable)	The value obtained from the input signal from the sensor.
PV start	When program control starts, control begins with the set value (SV) being the same as the measured value (PV).
SSR drive pulse type	control output specifications. Select this when control target is an SSR (solid state relay).
S.V. (Setting Value)	The target value when performing control.
MODBUS	specifications for the communication protocol used when connecting and communicating with controllers and external devices. MODBUS is a registration trademark of Schneider Electric.

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