SU371574A1 - • CONSOLIDATED |:) P? SCHM [x ;; hl ^ ISHG -'.- HA! - Google Patents

Description

one

The invention relates to the field of automated control systems and can be used in various areas of industry where there are a large number of objects to be monitored and it is required to ensure rapid collection and processing of information.

The known devices for interfacing computers with two-position sensors are based, as a rule, on the principle of ambient control and contain complex switching equipment that is not reliable enough and requires systematic maintenance and adjustment. The speed of these devices and the number of points they control is limited. Switching equipment has to operate continuously, so all objects must be interrogated periodically regardless of whether a controlled event has occurred on them or not. This leads to a large redundancy of the collected information and, as a result, requires additional equipment to select useful information from its general flow so that the redundant information is not sent to the computer.

The purpose of the invention is to reduce the amount of equipment of a device that interfaces a computer with

sensors, increasing reliability and eliminating redundant information.

This is achieved by the fact that two-position sensors, through the block of forming the necessary short duration of the pulses, the group coding block and the matching block are connected to the output register and the OR circuit, and then through the output buses to the computing machine whose control bus is connected to the output register.

The drawing shows a block diagram of a device for interfacing a computer with on-off pulse sensors.

The device comprises a pulse shaping unit 1, the purpose of which is to generate a pulse of sufficiently short duration at the moment the sensor responds;

group coding unit 2 for receiving a message from a single code pulse and increasing the power of the transmitted signal; block 3 matching, providing a consistent connection of the group coding unit 2 with the circuit "OR 4 and with the output register 5. The circuit" OR is used to generate a pulse, signaling to the computer about the recording of the next message in the output register 5. Output

a register is provided for storing the received message code and issuing it to the computer on its command.

The proposed device works as follows.

At the moment of the controlled event overlapping, the corresponding sensor is triggered and by block 1 an impulse of sufficiently short duration is formed. The impulse arrives at the bulk block 2, where it is converted into a message code consisting of an object code (object number) and a message sign code (monitored parameter). The signal, amplified by power, passes the matching unit 3, is fed to the input of the "OR 4" circuit and is written to the output register 5.

The OR circuit generates a pulse that signals the computer to write the next message to the output register. Based on the received impulse, the computational masses rewrite the contents of the output register into its operative memory.

The operation of the proposed device is based on the following principles.

There is an event at the facility (sensor worked) - there is information, there is no event (the sensor has not changed its state) - there is no information.

At the time of the occurrence of the event (sensor triggering), the device generates i-pulses of short duration.

Observance of the first principle allows eliminating redundant information and simplifying equipment. The implementation of the second principle is necessary so that the allowable time interval between any two neighboring events is within the limits excluding the mutual overlapping of neighboring events more often than is possible for a reliable assessment of the controlled process.

Subject invention

A device for interfacing a computational device with on-off pulse sensors containing an output register,

characterized in that, in order to reduce the amount of equipment, increase reliability and eliminate redundant information, it contains a pulse shaping unit, a group encoding unit, a matching unit and an OR circuit, where the pulse shaping unit is connected to the information input of the device and through the group encoding unit, a matching unit, an OR circuit and an output register to the device outputs, and an output register connected to the control input of the device.

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