SU1751720A1 - Device for monitoring multichannel object - Google Patents

Abstract

SUMMARY OF THE INVENTION: The device contains an input register 1. an element OR 9, a driver of 11 pulses, a generator of 12 pulses, an AND 10 element, an indicator 14 of an object's state, n control channels, each of them contains a block of 2 control actions matching, a block of 3 matching signals reactions, elements EXCLUSIVE OR 4, 5, elements AND 6-8. trigger 13 error, the indicator 15 channel state of the object. 1 il.

Description

Operation Object

4 sya

four

eight

The invention relates to automation and computing, in particular to software control of process equipment, and can be used to interface control systems with control objects.

A device is known to interface programmable control systems with control objects (relays, electromagnets, etc.), in which information about the state of individual control objects can be obtained only programmatically through the development of diagnostic programs.

The disadvantages of this device are due to the low diagnostic properties, the significant costs of the software for checking the status of control objects.

The closest to the proposed technical entity is an interface device in which information about the state of each control channel is obtained in hardware with the detection of non-switching and non-switching-off faults of the control object. At the same time, the different blinking frequency of the object channel indicator allows It is necessary to install a damaged channel and a type of fault. The resulting information enhances the diagnostic capabilities of the device while reducing software costs.

The disadvantages of the known device are the visual determination of the indicator blinking frequency and, consequently, the type of malfunction, which is due to subjective factors, and the fact that restoring the diagnostic capabilities of the interface device after fixing the malfunction in the channel (or several channels at the same time) is possible only after elimination malfunction and reset device.

The purpose of the invention is to increase the reliability of control results.

The drawing shows the functional diagram of the device.

The device contains an input register 1, blocks 2 matching control actions, blocks 3 coordinating responses, elements EXCLUSIVE OR 4 and 5, elements AND 6-8, element OR 9, element AND 10, driver 11 pulse, pulse generator 12, trigger 13 errors, the indicator 14 of the object state and the indicators 15 of the channel status of the object.

The device works as follows.

The programmable control system influences the installation and informational inputs on the state of a particular output of register 1, while the single state of a particular output of input register 1 corresponds to the command

to switch on the associated with this discharge through the block 2 of the control actions of the channel of the control object matching.

Simultaneously, the signal to turn on is fed to the input element EXCLUSIVE

0 OR 4. If the control object is turned on, the signal about the on state through the sensor of the control object and the response matching unit 3 is sent to the second input of the EXCLUSIVE element

5 or 4.

The equality of the signals at the inputs of the element EXCLUSIVE OR 4 results in a zero value of its output signal. Thanks to this, at the input of the element AND 6 and,

0 therefore, a zero signal is present at the input and output of the element OR 9 at which the pulse shaper 11 is not triggered. In this case, the zero level at the forward output of the trigger 13 error through

5 element AND 8 translates the element EXCLUSIVE OR 5 into a state in which the output signal of the latter corresponds to the output level of block 3, and therefore, when the control object is on

0 a single signal at the output of block 3 of the response response activates the indicator 15 of the object channel state,

In the event that the information on the inclusion of the object is not received (non-inclusion

5 object due to faults in the actuating element of the control object, in communication lines with a programmable control system, sensor malfunction of the control object or other communication), at the end of the block 3 coordination of responses and input element EXCLUSIVE OR 4 signal value is zero, which causes the appearance at the output of the EXCLUSIVE OR 4 element of a single signal, which through the elements AND b, OR 9 start the pulse shaper 11 with a pulse duration of 0.1-0.3 s. The generated pulse through the element And 7 is supplied to the synchronous input of the trigger 13 error,

0 recorded at the falling edge of the error signal that is currently at the information input of the trigger 13 error.

The established zero signal at the inverse output of the latter through the element I b blocks the restarting of the pulse former 11 and simultaneously prevents the passage of the pulses to the synchronous input of the trigger 13 error of the given channel through the element 7.

A latch on elements 6 and 7 of each control channel allows the recorded error signal to be stored in error trigger 13 in the event of subsequent failures in other control channels.

In addition, the zero signal at the inverse output of the trigger 13 error causes the zero output element And 10, which starts the generator 12 pulses, forming a sequence of pulses with a frequency of 0.5-1 Hz with a duty cycle 2. The started generator 12 pulses generates a flashing signal on the indicator 14 the state of the object, indicating a malfunction in the device.

The single output signal at the forward output of the error trigger 13 permits the passage of generator pulses 12 through the element AND 8 to the input of the EXCLUSIVE OR element 5, at another input of which there is a zero signal from the output of the control actions matching unit 3. As a result, at the output of the EXCLUSIVE OR 5 element, a periodic signal takes place corresponding to the signal at the output of the generator 12 pulses. Thus, when the control object is not turned on, the indication of the flashing type of the object state indicator 14 and the object channel state indicator 15 takes place. The periodic operation of the indicators coincides in phase and is determined by the frequency of the generator 12 pulses.

After elimination of the malfunction, the interface device is reset to the initial state by applying a signal Resetting to trigger 13 error.

If the control object is not disabled, i.e. when zeroing the corresponding output of the input register 1 and saving a single signal from block 3 of the coordination of responses, the device works in the same way. In this case, the indication of the faulty channel by the indicator 15 of the channel of the object is made by a flashing type counter-phase indicator 14 of the object due to inversion of the generator 12 pulses by the EXCLUSIVE OR element 5. The inverse operation mode of the latter is realized due to the presence of a single signal at the output of the response matching unit 3 .

Thus, by the flashing phase of the indicators, it is possible to unambiguously identify the faulty channel and the nature of the malfunction, which ensures high diagnostic functions of the device for detecting and searching for malfunctions.

Claims (1)

Invention Formula A device for controlling a multichannel object, containing an input register, the OR element, the pulse shaper, the pulse generator and, by the number of object channels, the control channels, each of which contains an indicator of the object channel state, an error trigger, the first element AND, the first and second elements EXCLUSIVE OR, as well as blocks for coordinating control actions and responses, the output and input of each of which are respectively the information output and the input of the control channel, which serve to connect to the input and output of the corresponding object channel, and in each control channel the input of the control actions matching block is the trigger input of this channel and is connected to the output of the corresponding bit of the input register; the first input of the first element EXCLUSIVE OR is connected to way out block matching the response, and the output - with the information input of the error trigger, the output of the second element is EXCLUSIVE OR connected to the input of the channel state indicator of the object transmitted the control channel, and the first input to the output of the first element I, connected by the first input 9m to the output of the pulse generator, characterized in that, in order to increase the reliability of the control results, the element And the state indicator of the object are entered into the device, and in each control channel - the second and third elements And, and the output element And is connected to the inverse input of the generator lock impulses connected by the output to the input of the object state indicator, and the output of the element OR is connected to the input of the pulse former, and in each control channel the start input of the channel is connected to the second input of the first element EXCLUSIVE OR, the output of which is connected to the first input of the second element I connected by the output with the corresponding input element OR m second input with inverse the error trigger output, with the corresponding input of the element And and the first input of the third element And, the second input of which is connected to the output of the pulse former, and the output to the clock input of the error trigger connected by the direct output to the second input of the first element And, and the output of the matching unit response reactions connected to the second input of the second element EXCLUSIVE OR.