SU1434419A1 - Information input device - Google Patents

Abstract

The invention relates to automation and computing and can be used to enter information from discrete sensors into control systems, working in real time. The purpose of the invention is to increase the reliability of the device. The device contains two shift registers 2, 3, the element INCR. 1 or 4, the element AND-NOT 5, the generator 6, the element 7, the counter 8. The register 2 performs the function of sequential switching of the input signals. Register 3 is a memory of the state of the sensors on the previous polling cycle. In the initial setup mode, registers 2 and 3 enter information about two consecutive states of sensors 1. In measuring mode, the EXCLUSIVE OR 4 element performs a bitwise comparison of the contents of shift registers 2 and 3. When a change in the state of any sensor is detected, further shift of the register information 2 and 3 is blocked and an interrupt request is issued to bus 12; tires 9 and 10 exhibit the number of the activated sensor and its status, respectively. After reading the information, the cyclic monitoring of the state of the sensors is resumed. 3 il. i O) 4i 00 CO

Description

The invention relates to automation and computing and can be used to enter information from discrete sensors into live control systems.

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

Figure 1 shows the functional diagram of the device; Fig. 2 is a diagram of the controlled generator; in Fig. 3, timing diagrams illustrating the operation of the controlled generator.

The device contains a block of 1 discrete sensors, shifting registers 2 and 3, the element EXCLUSIVE OR 4, the element AND-NOT 5, the generator of 6 pulses, the element AND 7, the binary counter 8, the address outputs 9 of the device, the information output 10 of the device 4 inputs ( bus) signals initial setup 11, the requirement of interruption 12 and the provision of interrupt 13 device

The device works as follows.

In the initial state, tires 11 and 13 contain potentials 1. Before starting the work on bus 11 of

management system enters the command

The initial setup is in the form of a pulse O. With a mouth, a potential 1 is formed at the output of the element NE-5, which is fed to the control input of the generator 6. If there are potentials 1 on the two control inputs, the generator 6 produces clock pulses with a frequency fQ, which, through the element 7, arrive at the counting input of the counter 8, the number of bits n + 1 of which is determined from the condition; K.2, where K is the number of sensors of unit 1,

When the counter 8 overflows, potential 1 enters the enable input of the register 2 setup; In this case, the counter 8 is set to O, and the register 2 records information about the state of discrete sensors of block 1. For each clock pulse coming from the output of element And 7 to the synchronization inputs of registers 2 and 3, information about the state of the sensors of block 1 shifts from register 2 to register 3. Upon the overflow of counter 8, a new information on the state of discrete sensors of block 1 will be entered into register 2

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After the removal of the Initial Setup command, the duration T of which is to be N 2fc (n + 1), the device is ready for operation and automatically for each clock pulse received from the output of generator 6, on the EXCLUSIVE OR 4 element, the state of the sensors is compared one by one entered in register 3 on the previous cycle, with new information on the state of the sensors.

When the state of a sensor of block 1 changes, new information at the end of the next cycle enters register 2. When comparing the bits of registers 2 and 3 with the changed state of the sensor, potential 1 is formed at the output of element 4. resulting in the formation at the output of an AND-HE element 5 a potential O, which stops the generator 6 and simultaneously via the bus 12 enters the control system, informing about the change in the state of the monitored object. At the same time, information on the current state of the sensor and its sequence number are displayed on the buses Yu and 13, respectively.

When reading information, the control system generates on the bus 13 a control signal in the form of a potential O, the duration of which is determined by the time required for reading the information. Upon completion of reading the information at the output of the element 7, a positive transition of the transition from state o to state 1 is formed, according to which the number of the next sensor is written to counter 8 and the input of the element (EXCLUSIVE or 4 comes from registers 2 and 3) analyzing the state of this sensor of block 1. If (there was no change in the state of the sensor, then at the output of the EXTENDED OR 4 element a potential O is formed, which causes the appearance of 1 at the output of the element AND-NOT 5 and the start of the generator 6. Requirement of interruption on the bus 12 neither are you is put.

The generator 6 (FIG. 2) generates pulses at the output that are delayed by half the period of the generated frequency relative to the moment when the second enabling pulse is applied to one of the inputs. All the generated pulses (fig.Z) have the same duration. If the enable signal

at one of the inputs of the generator 6 is removed before the end of the next pulse, the latter is formed completely. If there are no permit signals at the inputs, a potential is established at the output.

Thus, the proposed device, in each work cycle, updates information in the registers and, at any change in the state of discrete sensors, generates a signal about this fixes the sequence number of the sensor that changed state and the new position of the sensor. The change control of the sensor is performed using two shift registers and the EXTinct OR element. This allows us to simplify the algorithm of the device, i.e. increase its reliability.

Claims (1)

Invention Formula 25 A device for inputting information, containing two registers, a counter, an EXCLUSIVE OR element and a pulse generator, the output of the first register is connected to the first input of the EXTENDER OR element and is an information output of the device, the initial echoes of the first register are information 50 five 0 The device’s information inputs, the information outputs of the device are address outputs of the device, which is because, in order to increase the reliability of the device, the AND element and the NAND element are entered into it, the output of the second register is connected to the second input of the TEMPERATE OR element, which is connected to the first input of the element IS-NOT, the output of which is connected to the first control input of the pulse generator and is the output of the device interrupt request, the second control input of the pulse generator is combined with the first input of the electric And is the input representation of the device, the output of the pulse generator is connected to the second input of the element AND whose output is connected to the register synchronization inputs and the counter input, the transfer output of which is connected to the enable input of the first register setting, the information input of which is combined with the information input of the second the register and the first input of the EXCLUSIVE OR element, the second clock of the AND-NOT element is the input signal of the initial, device setup. VTOZ Umdy Figure 2. Phage.Z