The system measures the process, compares it to a setpoint, and then manipulates the output in the direction which should move the process toward the setpoint.
A control system with an architecture very similar to that of a DCS, with self contained power supplies, distributed inputs and outputs, and a controller module, all connected on high speed digital communication network.
A control system where the individual functions that make up a control system are distributed among a number of physical pieces of equipment that are connected by a high-speed digital communication network._____ refers to a control system usually of a manufacturing system, process or any kind of dynamic system, in which the controller elements are not central in location (like the brain) but are distributed throughout the system with each component sub-system controlled by one or more controllers. The entire system of controllers is connected by networks for communication and monitoring.)
An electric controller that has DC electric current as the output. Controller which is simpler to operate and has fewer variables that need setting.
Needed with flow control processes with fail closed final control elements for the controller.
(solenoid valve/ on/off) Acting directly, as one part upon another, without the intervention of other working parts.
Controller that produces an output that provides only an on/off signal to the final element of the process, also called a two position controller.
A controller that uses a microprocessor technology and special programming to perform that controller functions.
A configuration method that consists of two vertical rails, the left one being the source and the right one being the end, and sequential rungs of logic between the two.
___________is a set of devices used to manage, command, direct or regulate the behavior of other devices or systems.
A control strategy is where a nonlinear gain can be applied to a nonlinear process.
________ systems are communication networks designed to connect multiple operating units over mass distances to controllers, field gas sensors, leak detectors, sensors, remote video equipment etc.
_____________ diagrams generally show contacts and relays in their normal Position.
PLC's are principally involved in monitoring emergency shutdowns?
What types of input signals can a PLC read?
A PLC can be field programmed by the user?
A PLC can run its own error checking and self diagnostics?
A thermostat would be an example of a ____________acting system.
Which controller action ignores the valve action?
Fail open final control elements need what kind of control action for the controller?
What controller action takes the valve action into account?
What Controller is simpler and continuous to operate?
What kind of controller has a DC electric current as the output?
A DCS does requires an operating system?
One feature of a DCS is the computer sends signals directly to final control elements?
The main purpose of adaptive control is to handle situations where loads, inertia's, and other forces acting on the system change drastically?
An example of an adaptive controller is a commercial/ industrial food cooking process where maintaining the exact cooking temperature is essential to consistently producing a high quality product?
A control strategy where a nonlinear gain can be applied to a nonlinear process is called?
On/off is a control scheme that would result in a pump being started and stopped due to different levels in the tank.
Another name for a two position controller is?
An example of an on/off controller is your basic home thermostat; the furnace is either running or isn't?
Most computers require Digital information?
The type of control where analog controllers are assisted by a computer is called _______ control.
If a process is direct digitally controlled, there is no need for an operator?
cascade control system
A control system that is composed of two control loops with two controllers where one is the slave to the other is called?
A scheme were one control valve responds to the lower half of a controller output range and another control valve responds to the upper half is called?
What type of control method is used to provide the control of one flow based upon the measurement of two flows?
Another name for a feedforward control system is?
Another name for a feedback control system is?
What type of control system sends a signal to the final control element but does not verify the results of that control action?
The controller is connected to a process in an arrangement such that any change in the process is measured and used to adjust action by the controller is called what?
A feedback control system is a closed loop
A feedforward control system is a closed loop
Some of these valves include the Bay Scallop, oyster, butter clam, and the common mussel.