SU732844A1 - Computer and pulse sensors interface - Google Patents

Description

The invention relates to the field of computer technology and can be used in automated process control systems.

Known devices And for collecting ⁵ information from discrete sensors, containing a comparison device, a device for storing sensor codes, a recording device, a device for storing changes in the state of sensors, a communication device, registers and a device for generating a sensor address and performing the functions of pairing many sensors with a computer (VN) .

The disadvantages of these devices are their complexity and low reliability.

The closest in technical essence to the invention is a device ^ 2] for interfacing with pulsed BM _Μ GOVERNMENTAL sensors, comprising forming unit sensor signal, which input group is a group of input devices and a group of outputs connected to respective inputs of a coding unit coupled to the input output input matching unit, the first output of which is connected through an OR element to the control output of the device, and the second output to the input of the output register, the control input and output of which are respectively -retarded control input and output devices.

The lack of reliability of this device is due to the impossibility of its automatic verification.

The aim of the invention is to increase the reliability of the device.

This goal is achieved by the fact that the proposed device has a control sequence generation unit including an OR input element, an integrator, a pulse generator, a timer, a switch and two groups of elements I. The output of the coding block is connected to the input of an OR element, the output of which is connected via an integrator with the input of the generator

732844 4 pulses, the output connected to the inputs of the switch, time relay and the first group of elements I. The output of the switch is connected to the control inputs of the first and second groups of elements And? ₅ connected outputs to the corresponding control inputs of the coding block. The output of the time relay is connected to the input of the second group of elements I.

The drawing shows a structural 10 diagram of the device.

It contains a sensor signal generation unit 1, an encoding unit 2, an input matching unit 3, an OR element 4,

S output register 5, block 6 forming the reference sequence comprising input OR gate 7, an integrator 8, a pulse generator 9, a first group of AND gates 10, 11 relay time, a second group of elements 12 and ²⁰ and com- Mutator 13.

The device operates as follows.

When one of the sensors is triggered, a pulse of arbitrary amplitude and duration arrives at the corresponding input of block 1. On its basis, block 1 generates a pulse of a strictly specified amplitude and duration, after which it issues it to the corresponding input of block 2, which this pulse uses to form a parallel code for the transmitted message, which represents the address of the triggered sensor. From the output of block 2, a message code is sent via a common communication channel ^{35. to the} input of block 3 and on to the OR element 4 and register 5. The OR element 4, on the basis of the received parallel message code, generates an impulse that signals to the VM that the next message has arrived in register 5 Having received this signal, the VM overwrites the contents of register 5 in its RAM and puts it in a zero state. Block 6 measures the intensity of the message flow at the output of block 2 and, at pseudorandom time intervals, generates a sequence of two pulses applied to the control inputs of block 2. These pulses, following through the main circuits of the device in the VM, provide sporadic verification of these circuits using the VM.

Block 6 works as follows. The OR element 7 generates single ones; the pulses when each code appears on the output of block 2 and outputs them to the integrator 8. Depending on the frequency of arrival of single imgulses at the input of the integrator 8, the voltage at its output changes, which controls the generator 9, which determines the rhythm of the health check device circuits. The higher the intensity of the message flow through the device, the greater the voltage at the output of the integrator 8, and therefore, the lower the frequency of the generator 9. A feature of this generator is the significant instability of the generation of pulses separated by pseudorandom time intervals. The pulses from the output of the generator 9 are fed to the inputs of the group of elements And 10, turnip 11. and the switch 13. At the commands of the switch 13, the corresponding elements And the groups of elements 10 and 12 are opened. some dummy address, and the second pulse arriving after a delay on the relay 11 to the second input of block 2, indicates the control mode.

Thus, in the proposed device provides automatic monitoring of health, which increases the reliability of its work.

Claims (1)

1. USSR Author's Certificate No. 377759, cl. Q 06 F 3/04, 1970. 2, USSR Author's Certificate No. 371574, cl. Q 06 F 3/04, 197О (prototype).