RU171436U1 - PROGRAMMABLE LOGIC CONTROLLER FOR A TERRITORALLY DISTRIBUTED CONTROL SYSTEM - Google Patents

Abstract

The utility model relates to automated control systems for geographically distributed explosive production facilities operating in severe climatic conditions, and can be used to build control systems for ground-based infrastructure facilities for rocket and space complexes, as well as chemical and oil and gas installations. Programmable logic controller (PLC) - built according to the main modular architecture and consists of one or more placed in additional protective shells to arcs containing modules of the central processor, input and output modules of analog and discrete signals, as well as communication modules with support for external interfaces RS-485 or RS-232. The inter-module backbone in the chassis is organized using a passive backplane that contains duplicated CAN buses. Each frame contains a power management module that controls the input voltage of the frame, the current load on the internal bus power lines and the temperature of the frame, and sends out warnings to the central processor module when the input voltage rises, the load current or temperature increases, as well as an emergency disconnecting the frame from the input power source; and also performs the same indication of the emergency state of the input power. If there are several frames in the PLC, the integration of their inter-module lines is carried out by installing special CAN internal bus expansion modules in the frames. The technical result of the claimed utility model is to provide high PLC functionality, ease of redundancy of PLC components, increase its performance and increase reliability. 1 ill.

Description

The device relates to automated control systems for geographically distributed explosive production facilities operating in severe climatic conditions, and can be used to build control systems for ground-based infrastructure facilities for rocket and space complexes, as well as chemical and oil and gas installations.

The controller TREI-5B-04 of the company is known (TREI-5B-04 software control device. Operation manual. TREI.421457.401 RE. TREI JSC, 2016), which is built on the basis of unified constructs of the Euromechanics 19 ”standard with 3U module heights and and can be placed in a flameproof enclosure. The controller includes a PC-based master module (processor) and a set of intelligent modules for input / output of various types of signals (discrete, analog, pulse and others). The modules are combined with a redundant ST-BUSM trunk using the RS-485 interface. It is possible to backup individual modules. The disadvantage of this PLC is that it does not provide control over the supply voltage and current consumption, as well as the temperature of the controller equipment.

Explosion-proof PLC BAZIS-100 of ZAO Ekoresurs is known (Industrial Automated Control Systems and Controllers. 2012. No. 6 from 45-49), which includes processor modules, input and control channel modules, and a communication module combined by a duplicated CAN bus. Ethernet and RS-485 interfaces are used to exchange information with other PLCs, as well as remote equipment. The PLC supports redundancy at the modular level. The disadvantage of this PLC is its cradle-free modular structure, which makes it difficult to place it in an explosion-proof enclosure, in addition, the PLC does not provide control over the supply voltage and current consumption, as well as the temperature of the controller equipment.

The closest technical solution is the multifunctional high-performance programmable controller MFK3000 of the Tekol company ("MFK3000 is a programmable controller for critical applications and large-scale process control systems" (Industrial Process Control Systems and Controllers, No. 10, 2005). The specified PLC is designed as a frame in a construct "Euromechanics" and can be placed in an explosion-proof enclosure, contains processor and communication modules, various input-output modules, combined by a duplicated CAN bus, and p extension of the CAN bus to several frames. There is the possibility of redundancy at the modular level. The disadvantage of this PLC is that it does not provide control over the supply voltage and current consumption, as well as the temperature of the equipment of the frame. In addition, when expanding the CAN bus is not galvanic isolation tire segments of different carcasses.

The technical result of the claimed utility model is to provide high PLC functionality, ease of redundancy of PLC components, increase its performance and increase reliability by including power management module in the structure, as well as by combining the inter-module bus arrays by installing special CAN internal bus expansion modules connected interconnected by a separate galvanically isolated duplicated external CAN bus.

Brief Description of the Drawings

In FIG. 1 shows the PLC functional diagram, where 1 is the chassis, 2 is the passive backplane with the internal bus, 3 is the central processor module, 4 is the communication module, 5 is the input / output module for discrete and / or analog signals, 6 is the power management module, 7 - extension modules for the internal CAN bus, 8 - extension cable for the CAN bus, 9 - protective sheath.

Utility Model Implementation

Programmable logic controller (PLC) - is built according to the main-modular architecture and consists of one or several frames (1) made in the Euromechanics form factor 3U high, which can be placed in an additional protective explosion-proof shell (9).

The inter-module backbone in the frame is organized by means of a passive backplane installed in it with connectors for installing the required set of modules, which contains duplicated CAN buses, 27 V input power supply wiring buses and additional signals, in addition, an individual code is used in each panel connector, used for identification in CAN bus of the module installed in this connector.

The modules installed in the frame have the same design in the form of a printed circuit board 100 × 160 mm in size, on the front side of which a bar is installed, with display elements and connecting sockets for cable connection of sensors, actuators and external interfaces, and on the back side - a connector for connecting to the backplane.

Each PLC contains at least one central processor module (3), which performs the following functions:

- receiving data from input modules, and transmitting data to output modules;

- execution of the user program of the automation system;

- performing data exchange with a PC when programming the controller;

- performing data exchange over network interfaces using information-logical interaction protocols;

- monitoring the functioning of PLC modules;

- control messages power management module.

The central processing unit contains:

- A 32-bit 1986VE1T microcontroller with clock and internal FLASH program memory - 128 Kbytes and RAM RAM 48 Kbytes,

- external ROM on 1636РР1АУ microcircuits with a capacity of 16 MB;

- external RAM on 1645RU3AU chips with a capacity of 8 MB;

- proprietary external Ethernet and RS-485 interfaces (opto-coupled);

- duplicated CAN interfaces of the internal bus, equipped with opto-isolation.

In order to reserve or increase PLC performance, several modules of the central processor interacting via CAN bus can be installed in the frame.

Having its own external Ethernet and RS-485 interfaces allows, if necessary, connecting additional equipment (recorders, indicators, etc.) to the module, as well as organizing the exchange of information with a personal computer and other equipment via channels that do not require redundancy.

Communication modules (4) are designed for communication between PLCs and PCs, with other PLCs and / or with external specialized devices (smart sensors and actuators, modems, indicators, etc.).

The communication module is based on the 1986-BE 32-bit microcontroller and contains 2 channels of external RS-485 interfaces equipped with optocouplers. Connection to the internal PLC bus is performed by duplicated CAN interfaces equipped with optocouplers. There is a version of the communication module with external RS-232 interfaces.

Communication modules with the RS-485 interface allow the PLC as part of a geographically distributed control system with the common bus or star topology to exchange information with the same type of PLC, as well as with third-party devices, using standardized protocols of information and logical interaction (Modbus-RTU , Modbus-ASCII) with redundancy of channels.

I / O modules provide the exchange of discrete and analog signals with the control object. Each I / O module is a complete device that has immutable software. For each I / O module, a protocol of information and logical interface with a central processor module has been developed, which indicates the control and information commands, the algorithm of the module's behavior when receiving commands, as well as a description of the contents of RAM and ROM of the module available for reading and writing. According to the functions performed and the technical design, the input-output modules are divided into discrete interface modules with an object and analog input / output modules.

Discrete Interface Modules:

- Digital input: 32 channels, 5 V / 12 mA, “general plus”, power supply from the module, optical isolation 500 V; OR discrete outputs: 32 channels, 5 V / 20 mA, common negative, speed: on / off 2 ms, galvanic isolation 500 V. There are no testing of digital inputs and output current control.

- High-speed input / output of discrete signals: TTL, 4 groups of 8 channels. 10 μs, galvanic isolation, group switching to input / output.

- Relay output of 8 channels, 30 V, 2 A, two-stable relay RPK 44.

The modules use a 1986-BE 32-bit microcontroller. Input / output circuits have galvanic isolation and spark protection barriers. Connection to the internal PLC bus is performed by duplicated CAN interfaces equipped with optocouplers.

Analog input modules allow you to connect all types of sensors having a current or potential output, as well as resistance thermometers and thermocouples:

- Analog input: 4 channels, voltage 0 ... ± 10 V OR current 0 .. ± 20 mA, programmed control, basic reduced error ± 0.1%.

- Analog input: 4 connection channels - resistive sensors with resistance in the range from 0 to 800 Ohms with a 4-wire connection circuit, ± 0.2%.

Analog output modules allow connecting actuators with potential and current control:

Analog output: 4 channels, potential output ± 10 V ± 0.5%.

- Analog output: 4 channels, current output ± 20 mA ± 0.5%.

- Analog input: 2 channels of thermocouples in the range from -20 mV to +50 mV

The modules use a 1986-BE 32-bit microcontroller. Connection to the internal PLC bus is performed by duplicated CAN interfaces equipped with optocouplers. Analog input-output circuits galvanically isolated from the microcontroller. There is a power circuit for analog I / O circuits.

If necessary, you can increase the number of I / O modules installed in the PLC by using an additional frame. The intermodular frameworks of the frames are combined by installing special extension modules for the internal CAN bus (7), interconnected by a separate galvanically isolated duplicated external CAN bus (8). The expansion module uses the 1986BE91 microcontrollers as CAN repeaters.

PLC power supply is carried out from a direct current network with voltage (27 ± 10%) V. If necessary, power supply from an alternating current network with voltage (220 ± 10%) V 50 Hz using a module requires the installation of a special converter with an output voltage of 27 V.

PLC distributed power supply system - each module included in the PLC has its own DC / DC voltage converter, which converts the input voltage of the 27 V PLC to operating voltages.

Each frame contains a power management module (6), which:

- controls the input voltage of the frame,

- current load on the internal power lines of the internal bus,

- temperature of the frame,

- Issues warning messages to the central processor module when the input voltage rises, the load current or temperature increases.

The power management module performs:

- emergency shutdown of the frame from the input power source

- an indication of the presence of an external supply voltage of 27 V and voltage on the power lines of the internal backplane,

- indication of the emergency state by input power.

The presented PLC can be used as the central part of an automated control system, as an intelligent communication device with an object in a hierarchical distributed control system, and as a component of a decentralized distributed control system for geographically distributed explosive production facilities operating in severe climatic conditions.

The drawings attached to the description show:

In FIG. 1 shows the PLC functional diagram, where 1 is the chassis, 2 is the passive backplane with the internal bus, 3 is the central processor module, 4 is the communication module, 5 is the input / output module for discrete and / or analog signals, 6 is the power management module, 7 - extension modules for the internal CAN bus, 8 - extension cable for the CAN bus, 9 - protective sheath.

Claims (3)

1. A programmable logic controller for a geographically distributed control system for explosive hazardous production facilities, built according to the main module architecture and consisting of one or more frames placed in an additional protective shell containing at least one central processor module, as well as input modules and output of analog and discrete signals, communication modules with support for external interfaces RS-485 or RS-232, equipped with opto-isolation, all modules have their own built-in nnye galvanic isolated secondary power source; the intermodular trunk in the frame is organized using a passive backplane that contains duplicated CAN buses, the connection of modules to which are equipped with optocouplers, 27V input power supply wiring buses and additional signals, in addition, an individual code is used in each connector of the panel used for identification in the CAN bus installed into this connector of the module, characterized in that each frame contains a power management module that controls the input voltage of the frame, n current load on internal bus power lines and the frame temperature; it sends out warnings to the central processor module when the input voltage rises, the load current or temperature increases, as well as the frame is disconnected from the input power source; It provides an indication of the presence of an external supply voltage of 27 V and an internal voltage on the backplane lines, as well as an indication of the emergency state of the input power. 2. According to claim 1, characterized in that, if there are several frames in the programmable logic controller, the integration of their inter-module lines is carried out by installing special extension modules for the internal CAN bus connected to each other by a separate galvanically isolated duplicated external CAN bus.

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