RU73510U1 - FUNCTIONAL KEYBOARD (FC) - Google Patents

Abstract

The utility model relates to computing, in particular to automation systems for controlling technological processes of large industrial facilities and can be used in devices with a human-machine interface for use as part of automated control systems for information support and receiving commands from an operator that is resistant to any single failure, with the possibility of duplication of communication channels. For this, the FC contains a microcontroller, a keyboard scan unit, a control signal generator, an indication status unit, two Ethernet interface units, an address temporary storage unit, RAM, two galvanic isolation units, a keyboard, an indication unit, and an electronic key reader. The microcontroller is connected via an multiplexed data bus to Ethernet, RAM, a control signal conditioner and an address temporary storage unit. The last block demultiplexes the address / data bus and connects to the Ethernet and RAM controllers by the address bus. The driver issues control commands to the control bus, which is connected to the keyboard scan unit, display status unit, Ethernet units and RAM. The keyboard scan unit and the display status unit are connected to the keyboard and the display unit, respectively. External Ethernet lines are connected to interface units with network No. 1 and No. 2 through galvanic isolation units of the first and second channels, respectively. The electronic key reader is connected directly to the microcontroller.

Description

The utility model (PM) relates to computer technology, and in particular to automation systems for managing technological large industrial facilities and can be used to create control systems for critical facilities for organizing a human-machine interface.

No analogues found.

The task that PM is aimed at is a device for organizing a human-machine interface and using it as part of automated control systems for information support and receiving commands from an operator that is resistant to any single failure, with the possibility of duplication of communication channels.

The technical result is achieved by the fact that the FC contains a microcontroller, a keyboard scan unit, a driver of control signals, a display status unit, two Ethernet interface units, an address temporary storage unit, RAM, two galvanic isolation units, a keyboard, an indication unit, an electronic reader the key. The microcontroller is connected via an multiplexed data bus to Ethernet, RAM, a control signal conditioner and an address temporary storage unit. The last block demultiplexes the address / data bus and connects to the Ethernet and RAM controllers by the address bus. The shaper at the address on the address / data bus recognizes which unit is being accessed and issues control commands to the control bus, which is connected to the keyboard scan unit, display status unit, Ethernet and RAM units. Keyboard Scan Block and Block

indication states are connected to the keyboard and indication block, respectively. In addition, the keyboard is also directly connected to the microcontroller. External Ethernet lines are connected to interface units with network No. 1 and No. 2 through galvanic isolation units of the first and second channels, respectively. The electronic key reader is connected directly to the microcontroller.

The proposed utility model is illustrated in the drawing, where:

1) keyboard;

2) display unit;

3) keyboard scan unit;

4) driver of control signals;

5) indication status block;

6) microcontroller;

7) electronic key reader;

8) Ethernet interface unit No. 1;

9) Ethernet interface unit No. 1;

10) block temporary storage of the address;

11) RAM;

12) galvanic isolation unit No. 1;

13) galvanic isolation unit No. 2;

14) Multiplexed address / data bus;

15) Address bus;

16) control bus;

17) Bus scan keys;

18) Keyboard status bus;

19) Indication control bus;

20) Electronic key reading lines

Initialization of the FC begins with a self-test of all the main functional units 4, 8, 9, 11 that are part of the FC and the configuration of the interface blocks with the Ethernet network for the required operating mode of 8, 9. Next

the functioning of the FC depends on the current mode of operation, in the general case, the operation of the blocks can be divided into 2 parallel processes:

- microcontroller 6 electronic key and through block 3 scans the keyboard 1;

- in the second, the interface blocks with the network 8, 9 receive packets on the Ethernet network 21, 22. Those packets that are not designed by the FC are ignored. The remaining packets are processed.

Microcontroller 6 can pause scanning of keyboard 1 for two reasons:

- some key is pressed or an electronic key is entered;

- An Ethernet packet destined for the FC came.

In the case when one of the keys is pressed, it determines the number of the pressed key and the microcontroller 6 stops scanning the keyboard. If an electronic key is entered, it is stored in RAM 11. Then, the microcontroller 6 configures the Ethernet 8, 9 interface blocks for transmission, writes a command in the data field (buffer) depending on the number of the key pressed, or the saved electronic key and continues to scan the keyboard 6. At the same time, the packet is transmitted by the interface units to the Ethernet 8, 9 network.

In the case when the packet came from the Ethernet 21, 22 network, intended by the FC, it is recognized by one of the interface units with the Ethernet 8 or 9 network, depending on which channel it was received on. Next, the microcontroller 6 reads the status of the interface units 8, 9, after which it stops scanning the keyboard 1 and processes the received packet. Three processing cases are possible:

- the package can be designed to be written to RAM 11. Then the driver 11 selects RAM 11, and the microcontroller 6 stores the received data;

- the package can be designed to display new information on the display unit 2. Selected control signals

indication status block 5, in which the microcontroller 6 makes the changes. After completing all these operations, the microcontroller returns to scan the keyboard 1 (through block 3);

- the packet may contain information for transmission to another channel. The driver of the control signals selects the interface unit with the Ethernet network (8 or 9), into which it is necessary to transfer the packet, sets it for transmission and writes information for transmission in the data field.

Keyboard 1 is a matrix of keys. The keyboard is scanned by writing a logical “zero” to the keyboard 3 scanning unit via the control bus 16. To transmit the scanning signal from the keyboard 3 scanning unit directly to the keyboard 1, the key scanning bus 17 is used. The set scanning code determines the line number in which the scanning is performed. Reading data from the keyboard status bus allows you to determine the column number with the key pressed.

The operating mode of the FC and its current state is displayed using the display unit 2. The indicators are controlled by the display control unit 5 via the display control bus 19.

The display control unit 5 is a set of storage elements storing the state of each indicator. Record of updated data on the state of the FC is carried out by the microcontroller 6 to the multiplexed address / data bus 14, and the control is performed by the driver of control signals via the control bus 16.

The control signal generator 4 generates control signals for the keyboard scanning unit 3, indication status block 5, RAM 11 and two interface units with the network 8, 9. The corresponding control signals (16) are generated by analyzing the status of the address 15 bus.

The electronic key reader 7 is used to enter a special code. It contains directly an electronic key reader and

two-color indicator, indicating the correctness of the entered electronic key. Reading the electronic key is carried out on lines 20.

The temporary storage unit of address 10 is used to store the least significant bits of the address when accessing the interface blocks with the network 8, 9 and RAM 11, because bus address / data 14 microcontroller 6 multiplexed. This block is a storage element, information is recorded on lines 14, and the issuance of the address on lines 15.

RAM 11 is intended for temporary storage of information that is changed during the execution of the program of the microcontroller 6. When writing or reading RAM 11, the least significant bits of the address on the lines 14 are stored first in the temporary storage unit of the address, then on the lines 15 are installed on the RAM. The high order bits of the address are taken directly from the microcontroller 6. Data, as well as the high order bits of the address, are set directly from the microcontroller via lines 14.

The interface blocks to the network 8, 9 are used to connect the FC with two independent Ethernet network channels 21, 22. Initial initialization and configuration for packet transmission is carried out by the microcontroller 6. The interface blocks to the network 8, 99 are responsible for the design of the Ethernet frame, its transmission to the network, collision tracking, receiving and filtering received packets. The microcontroller 6 sets the contents of the frame data field and the receiver address. The connection of the microcontroller and the interface units to the network is the same as the connection to RAM. To protect the blocks of interface with the network at their outputs and inputs, galvanic isolation 12, 13 is used.

Claims (1)

A functional keyboard containing a microcontroller that controls all the blocks and determines the FC operation algorithm, Ethernet interface blocks that provide communication with objects via the Ethernet network, RAM, which is necessary for storing working information, an address temporary storage unit that organizes the microcontroller's communication with RAM and network blocks Ethernet, a control signal generator that issues control commands, an indication control unit and a keyboard scan unit, which control the display unit and keyboard, respectively, which in turn the turn provides the reception of commands from a person and the issuance of information on the status of mechanisms.