Control Level

Control Level

 

any one of the relative gradations of sets of control elements in an integrated system, grouped and separated according to the hierarchical principle of control. The control elements of various levels are interconnected and strictly subordinated.

In hierarchical control systems, each subdivision, or subsystem, solves only problems of its own level; the original information for decision-making and developing control signals is transmitted from lower to higher levels, and the control information or signal is transmitted from higher to lower levels. In a digital computer, for example, the operation of the individual units, such as memories, printers, and the like, is coordinated according to the specific computer program by a central unit, in which one link is the computer’s control console (at the highest control level). Local controls (at the lowest control level) are commanded by the central control unit; they generate signals to execute individual operations according to their own operating algorithm, and the aggregate of these operations constitutes the computational process.

In automated production control systems, the automatic controllers that control actuating mechanisms and machine functions, together with the measuring transducers (sensors) that monitor the progress of the production process, constitute the lowest control level. Monitoring and measuring information from the sensors is fed to a dispatcher’s control panel or to a control computer (the highest level), which evaluates the accuracy with which operations are being executed and then generates commands to be fed to elements at the lowest control level. In more complex systems, such as automated control systems for an industry branch or an enterprise or integrated power grids, there may be three or more separate control levels.

The separation of control functions by control level in integrated systems makes it possible to restrict the range of problems solved by each subdivision, regulate the distribution of information among control elements, simplify accounting and reduce the number of documents required, and improve the quality of decisions made.

References in periodicals archive ?
Contract Awarded For:Chemicals sldl-c, sldl control level 1 para.2, letter d)
The ATP concentration increased significantly after both low and high temperature stress, but returned to the control level after 8 h of recovery.
A wide range of product types and sizes are eligible for certification, so customers can choose equipment at the right size and control level for their facilities' needs.
The control system of the motion module combines both tactical and executive control levels. The tactical control level directly interacts with the NCM via the NCM-MM interface and receives from it necessary data to execute motion instructions: information about the coordinates and orientation of the robot in initial and final positions, data on the local map (if available), etc.
Among the female workers the difference between MHLC and the mean score of external control level was found to be statistically significant(p<0.01) (Table 2).
1 each task is associated with a certain control level entailing the stakeholders, personnel, and coordination presented within that control level.
In the next generations the survival index is restored to the control level. The survival at the concentrations of 1/10, 1/30 and 1/60 of the [LC.sub.50] for 29-W, 29-R, 30-D compounds was maintained at a control level.
The application of CD by increasing water table control level to a suitable level could effectively reduce AV losses and irrigation water volumes from CI paddy fields.
The two-day conference aims at highlighting the role and importance of communications, the leadership and control level in enhancing traffic safety.
Proposed in this chapter is a concept of an advanced hierarchical control system particularly dealing with the structure of the strategic control level for the industrial robots able to deal with assembly as well as robotized machining.
The compact, single point ultrasonic controllers continuously monitor and control level in liquids, solids, or slurry applications for a wide range of industries.
switching and fault signals from the hazardous area are simultaneously transferred to the control level via a single output to maximize signal transmission integrity