SU947828A1 - Programmable controller - Google Patents

Description

The invention relates to automation, and more specifically to software control of electromechanical equipment.

Programmable controllers are now widely used to control electromechanical equipment in industry. One of the most important tasks in the development of programmable controllers is to ensure their reliability and noise immunity.

A universal control device with programmable logic is known. This device consists of the following main functional units: input block, control block, output block. The principle of operation of the device consists in the sequential interrogation of input signals, their logical processing and the issuance of signals to output devices, which provide storage of the signal until the next work cycle 1.

The main disadvantage of this device is its low reliability, since due to the influence of interference on the input channels or on the control unit in any device operation cycle, false

p Shi about turning on or off the actuators.

Of the known programmable controllers, the closest in technical essence to the proposed is a programmable controller, which contains input blocks, a processor and output blocks.

The controller runs the next cycle.

The first is: polling all input blocks, when information about the state of the controlled object is entered into the processor; second: making a decision about transferring the managed object to a new one (state based on the information received and in accordance with the program stored in the processor's memory; actuators are switched by decision. The main function performed by a programmable controller is the control of objects whose operation algorithm is described by Boolean equations of the form

Claims (2)

1. Universal control devices with program logic, ULL. TRUDY VNIIR, Cheboksary, 1978. 2. Lytkin K.I., Levin D.A. A programmable command device for controlling machines and automatic lines — Machine tools and tools, 197 No. 9. p., 8–11 (prototype).