RU2477911C1 - Input-output module for data bus - Google Patents

Abstract

FIELD: radio engineering, communication.

SUBSTANCE: input/output module for data bus capable of attachment to carrying bus and containing terminal points for connecting via wires bus users and electronic equipment that connects users with serial data bus and performed in a form of connecting clamp with integrated or fixed-on electronics, galvanic isolated optical data bus made as bi-directional optical interface, including optical information receiving channels made on the base of infrared optical photodiodes and optical information transmitting channels made on the base of infrared optical light-emitting diodes, located on both sides of the module. Power supply of module electronics and input/output charts is performed from power supply charts of input/output devices without galvanic isolation from them.

EFFECT: increase of input/output module interference protection due to presence of optical interface in module, presence of input/output optical interface allows linking together input-output systems from modules mounted on DIN rail.

Description

The invention relates to input / output modules for a data bus that are adapted to be mounted on a carrier bus next to other modules

Known I / O module for the data bus, made with the possibility of mounting on a carrier bus next to other modules, containing terminal places for parallel connection by wires of bus users, for example, actuators, sensor sensors, devices, and electronics, connecting users with a serial conductor of the data bus characterized in that the input / output module is made in the form of a connecting clip with built-in or plug-in electronics and with the possibility of mounting on a carrier bus in the form of a separate bus terminal or in the form of a bus terminal block formed of several bus terminals connected in groups, both the data bus conductors and the power supply conductors for the input / output electronics are integrated into the individual bus terminals and passed through them, while each individual the bus terminal and each bus terminal block on their lateral surfaces facing adjacent terminals respectively have bus contacts so that the bus contacts automatically close the bus terminals when mounting the bus terminals on the carrier bus each other in the direction of sequential installation of the bus terminals, so that the bus terminals fixed on the carrier bus are connected to the terminal bus through the conductors of the data and power bus passing through (RF Patent No. 2139615, IPC H01R 9/26, publ. 10/10/1999).

The disadvantages of the known module include the following:

- galvanic communication of input-output modules via a data bus,

- break of the data bus in case of removal of one or more modules,

- unreliability of the mechanical contact connection of the data bus.

The technical problem to which the claimed invention is directed is to create an input-output module with a galvanically isolated optical data bus having a high level of noise immunity and the ability to power the input-output module from a sensor power supply or actuator.

The stated technical problem is solved in that the input / output module for the data bus, made with the possibility of mounting on a carrier bus and containing terminal places for connecting bus users with wires and electronics, connecting users with a serial data bus and made in the form of a connecting clip with a built-in or mounted electronics, according to the proposed invention is equipped with a galvanically isolated optical data bus, made in the form of a bi-directional optical interface, in connecting optical channels for receiving information made on the basis of infrared optical photodiodes, and optical channels for transmitting information made on the basis of infrared optical LEDs located on both sides of the module.

In addition, the power supply of the module electronics and input / output circuits is carried out from the power supply circuits of input / output devices without galvanic isolation from them.

The technical result, the achievement of which is ensured by the implementation of the entire claimed combination of essential features, is to increase the noise immunity of the input-output module due to the presence of an optical interface in the module. In addition, the presence of an optical input-output interface makes it possible to assemble input-output systems from modules mounted on a DIN rail.

The essence of the claimed invention is illustrated by drawings, in which Fig. 1 shows a structural embodiment of an input-output module with an optical interface, Fig. 2 shows a layout of elements of an optical interface.

Figure 1 and figure 2 contain the following positions:

1 - module housing,

2 - printed circuit board with integrated electronics,

3, 4, 5, 6 - terminals of the input / output signals,

7 - module power connection terminals,

8 - LEDs for signal status and error indication,

9, 11 - IR optical receiving photodiodes,

10, 12 - IR optical transmitting LEDs,

13 - DIN rail.

The input / output module for the data bus contains (Fig. 1) a bus terminal housing (1) with lateral fasteners on a DIN rail 13 in a known manner next to other modules or current-carrying or isolation terminals; printed circuit board with integrated electronics (2), which ensures the operation of the optical interface of the input-output module and input-output circuits; spring terminals (3, 4, 5, 6) for connecting I / O signals; spring terminals (7) for connecting the module power; LED (8) for changing the status of an input / output signal or error diagnostics; an optical interface, including optical channels for receiving information made on the basis of infrared optical photodiodes (9, 11), providing information reception on the optical data bus, and optical channels for transmitting information, made on the basis of infrared optical LEDs (10, 12), providing information transfer on the optical data bus.

Each input / output module of the data bus performs the functions of a receiver, transmitter, and transit device for information on the optical data bus, therefore, information reception channels made on the basis of infrared optical photodiodes (9, 11) and optical information transmission channels made on the basis of infrared optical LEDs ( 10, 12) are located on both sides of the module.

This design, unlike the prototype, allows to achieve high-voltage galvanic isolation between the next installed data bus modules. The presence of an optical interface, in contrast to the prototype, determines the absence of strict requirements for the design of the housing (1) and the presence of special elements providing contact communication between the modules.

Any module from the group of installed modules, unlike the prototype, can be removed without violating the integrity and operability of the optical interface. The ability to continue working on an open optical channel is limited only by the geometric straightness of the mounting rail and the dimensions of the mounting space.

The optical interface, unlike the prototype, allows you to install between the data bus modules additional communication and isolation terminals of various designs and manufacturers, used in a known manner for marking and propagating communications, the only requirement for which is the presence of an optically transparent window in the field of transmission of the optical interface beams.

The optical interface is implemented on the basis of two pairs of receiving and emitting infrared LEDs located on both sides of the module and controlled by a microcontroller located on a printed circuit board with integrated electronics (2). Exchange on the interface is carried out using the information package. Each module on the interface is a translator of this package down the interface, if this module is not its destination. If the module is the addressee of the information package, it reads from it the information intended for the module (for example, the current state of the output channels of discrete signals) and writes to the information package information intended for transmission to the module that controls the interface (for example, the current state of the input channels of discrete or analog signals).

The presence of galvanic isolation between modules on the optical interface, unlike the prototype, allows not to use galvanic isolation of the module from input / output channels, including high-voltage ones, which significantly reduces the cost of the modules and reduces their dimensions.

The advantages of the proposed module are:

1. Higher noise immunity of the modules compared to the contact method of transmitting interface signals.

2. An increase of more than an order of magnitude of the exchange rate of modules on the optical interface compared to the contact interface.

3. The performance of a system of several modules is not violated when one or more modules are removed from the system.

4. The design of the claimed module allows the installation between modules of additional switching and service terminals, as well as other devices without interfering with the intermodule interface.

5. The design of the claimed module allows the use of modules of different sizes and different designs, the only requirement is a certain location of the elements of the optical interface.

6. The ability to build an internal circuit of the module without galvanic isolation from input / output channels due to the optical input / output interface.

7. The design of the claimed module allows you to abandon the use of special contact bus transmission from the module to the module of the supply voltage of the module and the voltage of the input / output channels, due to the galvanic isolation of the interface, the electronics of the module is powered by the supply voltage of the sensors or actuators.

8. The design of the proposed module eliminates the need to use in a group of modules having the same power parameters for input / output channels, because the power supply of each of them does not depend on the neighboring module.

Claims (2)

1. The input / output module for the data bus, made with the possibility of mounting on a carrier bus and containing terminal places for connecting wires of bus users and electronics connecting users with a serial data bus and made in the form of a connecting clip with built-in or plug-in electronics, characterized in that is equipped with a galvanically isolated optical data bus, made in the form of a bi-directional optical interface, including optical channels for receiving information made on based on infrared optical photodiodes, and optical information transmission channels made on the basis of infrared optical LEDs located on both sides of the module. 2. The input / output module according to claim 1, characterized in that the power supply of the module electronics and input / output circuits is carried out from the power supply circuits of the input / output devices without galvanic isolation from them.