CN113363775B

CN113363775B - Connection mode of IO card and bus base of DCS hardware and signal transmission method

Info

Publication number: CN113363775B
Application number: CN202110626710.5A
Authority: CN
Inventors: 喻越
Original assignee: Beijing New Intelligent Tech Co ltd
Current assignee: Beijing New Intelligent Tech Co ltd
Priority date: 2021-06-04
Filing date: 2021-06-04
Publication date: 2023-02-10
Anticipated expiration: 2041-06-04
Also published as: CN113363775A

Abstract

The invention provides a connection mode and a signal transmission method of an IO (input/output) card of DCS (distributed control system) hardware and a bus base, wherein the IO card comprises a first card board and a second card board, the second card board is a signal processing board, the tops of the first card board and the second card board are communicated and signal-linked through contact pins, and the bottoms of the first card board and the second card board are fixedly connected through U-shaped sheet metal parts; the bus base is electrically connected with the first clamping plate through a first connector, the bus base is electrically connected with the second clamping plate through a second connector, the first connector and the second connector are arranged side by side, the first connector and the second connector are both DIN connectors, the first connector is used for power supply of IO clamping pieces and communication of a communication bus and an address bus, the second connector is used for inputting field signals of the IO clamping pieces, and the field signals comprise two-wire signals and three-wire signals. The connecting mode of the invention is convenient for the installation and the disassembly of the clamping piece, has good electromagnetic shielding effect, and can effectively prevent the on-site strong electric signal from fusing the wire.

Description

Connection mode of IO card and bus base of DCS hardware and signal transmission method

Technical Field

The invention relates to industrial control equipment, in particular to a connection mode of an IO card piece and a bus base of DCS hardware and a signal transmission method.

Background

In industrial automation systems, distributed Control System (DCS) modules are typically mounted in one or more enclosures that are then fitted together with a base. A plurality of distributed control modules are installed in the cabinet in a mutually cascading mode, and when a plurality of DCS modules are adopted, the existing DCS modules are connected through the base to achieve connection among the DCS modules. At present, the base and the clamping piece are manufactured by opening a plastic mould, so that the product is easy to age, deform and corrode and has no electromagnetic shielding effect.

Disclosure of Invention

In order to solve the technical problems, the invention provides a method for connecting an IO card, a power bus, a communication bus and a field signal in DCS hardware, the structure is completed by a sheet metal part, the method is simple, reliable and durable, has a good electromagnetic shielding effect, meets the requirement of severe environment of an industrial field, and is applied to DCS card and bus base products produced by the company. The traditional domestic and foreign products are made into bases and clamping pieces by opening the moulds with plastic moulds, are easy to age, deform and corrode and have no electromagnetic shielding effect.

In order to achieve the purpose, the invention provides the following technical scheme:

on one hand, the invention provides a connection mode of an IO card of DCS hardware and a bus base, wherein the IO card comprises a first card board and a second card board, the second card board is a signal processing board, the tops of the first card board and the second card board are communicated through contact pins, and the bottoms of the first card board and the second card board are fixedly connected through U-shaped sheet metal parts;

the circuit board of the bus base comprises 4 layers, the bottom layer and the top layer are all copper-clad, and double redundant wiring is adopted in the middle two layers;

two ends of the bus base are respectively provided with a D-Sub connector which is used for connecting an IO card piece or an external CPU in series, and 2 adjacent pins in the D-Sub connector define the same function; a wiring terminal is arranged on the left side of the bus base, and a safety terminal is arranged on the inner side of the wiring terminal; the right side of the bus base is provided with at least one power supply terminal; a dial switch of the card member address is also arranged on the bus base;

the bus base is electrically connected with the first clamping plate through the first connector, the bus base is electrically connected with the second clamping plate through the second connector, the first connector and the second connector are arranged side by side, the first connector and the second connector are DIN connectors, the first connector is used for power supply of IO clamping pieces and communication of a communication bus and an address bus, the second connector is used for inputting field signals of the IO clamping pieces, and the field signals comprise two-wire signals and three-wire signals.

Further, the first connector comprises a first plug and a first socket, the first socket is mounted on the bus base, and the first plug is mounted on the first card board; the second connector comprises a second plug and a second socket, the second socket is installed on the bus base, and the second plug is installed on the second clamping plate.

On the other hand, the invention also provides a signal transmission method of the IO card piece and the bus base of the DCS hardware, when the current of the field signal is more than 0.5A, the field signal enters the bus base from the wiring terminal and then enters the signal processing board of the IO card piece through the safety terminal;

when the current of the field signal is less than 0.5A, the field signal enters the bus base from the wiring terminal and then directly enters the signal processing board of the IO card.

Compared with the prior art, the invention has the beneficial effects that:

1. the IO card piece, the power bus, the communication bus and the on-site signal connection method in the DCS hardware have the advantages that the structure is completed by the sheet metal parts, the method is simple, reliable and durable, has a good electromagnetic shielding effect, meets the requirements of severe environments of industrial sites, is applied to DCS card pieces and bus base products produced by the company, and traditional domestic and foreign products are manufactured into bases and card pieces by opening a plastic die, so that the base and the card pieces are easy to age, deform and corrode, and have no electromagnetic shielding effect;

2. the circuit board of the bus base comprises 4 layers which are in a laminated design, the bottom layer and the top layer are all coated with copper, and the circuit board is electrically connected with the ground through a shell to form an effective shielding layer, so that the anti-interference capability of a communication bus is improved. The two middle layers adopt dual redundant wiring for field signals, so that the wire is effectively prevented from being fused by field strong electric signals;

3. the two standard D-Sub connectors are respectively arranged at the two ends of the bus base, so that the cascade connection of various clamping pieces is facilitated, the installation space of the clamping pieces is reduced, and the installation and the disassembly of the clamping pieces are facilitated; and a dial switch for distinguishing addresses is arranged on the bus base, so that the situation that an engineer dials the addresses of the card by mistake can be avoided, and the working complexity of the engineer is reduced.

Drawings

FIG. 1 is a schematic view of an IO card electrically connected to a bus base;

FIG. 2 is a schematic diagram of a serial configuration of two bus bases;

FIG. 3 is a schematic view of a bus base with 32-bit field signal terminals;

FIG. 4 is a schematic view of a bus base structure with 64-bit field signal terminals;

fig. 5 is a schematic view of a bus base structure provided with a field signal DB25 connection terminal.

In the figure: 1-IO card; 11-a first card; 12-a second card; 2-bus base; a 21-D-Sub connector; 22-a connection terminal; 23-a fuse terminal; 24-a power supply terminal; 25-dial switch of card address; 3-a first connector; 31-a first plug; 32-a first socket; 4-a second connector; 41-a second plug; 42-second socket.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", "front", "rear", and the like indicate orientations and positional relationships based on the orientations and positional relationships shown in the drawings, which are only used for convenience of description and simplification of description, but do not indicate or imply that the devices or elements to be referred must have specific orientations, be constructed in specific orientations, and be operated, and therefore, are not to be construed as limitations of the present invention.

Example 1

Referring to fig. 1 to 5, in an embodiment of the present invention, an IO card 1 of DCS hardware is connected to a bus base, where the IO card 1 includes a first card 11 and a second card 12, the second card 12 is a signal processing board, tops of the first card 11 and the second card 12 communicate with each other through pins, and bottoms of the first card and the second card are fixedly connected through a U-shaped sheet metal part.

The circuit board of the bus base 2 comprises 4 layers, the bottom layer and the top layer are all copper-clad, and are electrically connected with the ground through a machine shell to form an effective shielding layer, so that the anti-interference capability of the communication bus is improved. The two middle layers adopt dual redundant wiring for field signals, and the wire is effectively prevented from being fused by the field strong electric signals.

Two ends of the bus base 2 are respectively provided with a D-Sub connector 21 which is used for connecting an IO card element or an external CPU in series, and 2 adjacent pins in the D-Sub connector 21 define the same function; a wiring terminal 22 is arranged on the left side of the bus base 21, and a safety terminal 23 is arranged on the inner side of the wiring terminal 22; at least one power terminal 24 is arranged on the right side of the bus base 2; a dial switch 25 for the address of the card is also arranged on the bus base 2;

the bus base 2 is connected through first connector 3 electricity with first cardboard 11, bus base 2 is connected through second connector 4 electricity with second cardboard 12, and first connector 3 and second connector 4 set up side by side, first connector 3 and second connector 4 are the DIN connector, first connector 3 is used for the power supply of IO fastener 1 to and the communication of communication bus and address bus, second connector 4 is used for the input of the field signal of IO fastener 1, and the field signal includes two-wire system signal and three-wire system signal.

Specifically, the first connector 3 includes a first plug 31 and a first socket 32, the first socket 32 is mounted on the bus base 2, and the first plug 31 is mounted on the first card board 11; the second connector 4 comprises a second plug 41 and a second socket 42, the second socket 42 being mounted on the bus base 2, the second plug 41 being mounted on the second card 12.

In consideration of the characteristics and the number of signals, the mounting mode of a card, redundancy backup and the like in the design, the first connector 3 is a 48-core DIN connector 09062486835 of HARTING company, and the second connector 4 is a 48-core DIN connector 09061486901 of HARTING company.

In order to avoid mutual interference between the field signal and the signal inside the IO card element 1, the field signal and the signal inside the IO card element 1 are separated, namely the signal of the first connector 3 is a communication bus signal and a power bus; the second connector 4 is a field signal. The 2 connectors are arranged next to one another on the circuit board of the bus bar 2, the first connector 3 for communication being arranged on the right and the second connector 4 for the input of field signals being arranged on the left.

The first connector 3 is mainly a power supply and communication bus of the IO card, and an address bus.

The second connector 4 is the input of the field signal of the IO card. The field signal is divided into a two-wire signal and a three-wire signal, and thus the pin definition defining the second connector 4 is divided into 2 kinds.

The pin definition of the first connector 3 is shown in table 1, the pin definition of the second two-wire field signal connector 4 is shown in table 2, and the pin definition of the second three-wire field signal connector 4 is shown in table 3.

Table 1 pin definition of the first connector 3

TABLE 2 two-wire field Signal second connector 4 Pin definition

TABLE 3 Pin definition of the second connector 4 for three-wire system field signals

It should be noted that, the cascade mode of the bus base is as follows:

DPU controller and IO fastener communication adopt the bit bus structure, belong to the series relation between the IO fastener, and each IO fastener is by dial switch selection identity address on bus base 2. Two sides of the bus base 2 are respectively cascaded with the DPU and other IO cards by adopting a plug and socket of a standard D-Sub connector 21.

The two standard D-Sub connectors 21 are respectively arranged at two ends of the bus base 2, so that the cascade connection of various clamping pieces is facilitated, the installation space of the clamping pieces is reduced, and the installation and the disassembly of the clamping pieces are facilitated; and a dial switch 25 for distinguishing addresses is arranged on the bus base 2, so that the situation that an engineer dials the addresses of the card by mistake can be avoided, and the working complexity of the engineer is reduced.

The cascade connection of the bus base 2 considers signal redundancy backup in design, and in the D-Sub connector 21, adjacent 2 pins are defined as the same function, so that the reliability of the system is improved, and the pin definition of the D-Sub connector is shown in table 4.

TABLE 4D-Sub connector pin definitions

Pin number	Pin definition	Remarks to note
			1，14	CLK2-	Second path communication clock-
2，15	CLK2+	Second path communication clock +
			3，16	DATA2-	Second path communication data-
4，17	DATA2+	Second path of communication data +
			5，18	CLK1-	First path communication clock-
6，19	CLK1+	First path communication clock +
			7，20	DATA1-	First path communication data-
8，21	DATA1+	The first path of communication data +
			9，22	24V1+	First path 24V power source +
10，23	24V1-	First path 24V power supply
			11，24	24V2+	Second path 24V power source +
12，25	24V2-	Second path 24V power supply
			13	GROUND	Machine shell ground

Example 2

When the current of a field signal is larger than 0.5A, the field signal enters a bus base 2 from a wiring terminal 22 and then enters a signal processing board of an IO card 1 through a safety terminal 23. The design can prevent the large current from burning out the clamping piece due to field error wiring, and the clamping piece is protected.

When the current of the field signal is less than 0.5A, the field signal enters the bus base 2 from the wiring terminal 22 and then directly enters the signal processing board of the IO card 1, and the insurance terminal is electrically connected with the IO card.

2 connectors of the bus base 2 are arranged on the left and right, and the field signal is arranged on the second connector 4, and the communication and power supply of DCS is arranged on the first connector 3; the mutual isolation of the field low-frequency signal and the high-speed communication signal is ensured, the anti-interference capability of the DCS is improved, and the original field signal is protected. The bus base 2 is connected with all field signals through 2 interfaces of MKKDS1.5/2-5.08 double-layer four-bit wiring terminals and MKDS1.5/2-5.08 single-layer two-bit wiring terminals; to facilitate field wiring, a 24V switching signal with field current less than 0.5A can be coupled to the base 2 through an interface DB25A/F (straight, hole). The definition of the bus base as a 32-bit terminal is shown in table 5, the definition of the bus base as a 64-bit terminal is shown in table 6, and the definition of the bus base DB25 terminal is shown in table 7.

TABLE 5 definition of bus base for 32-bit terminals

TABLE 6 definition of bus base as 64-bit terminal

TABLE 7 definition of bus base DB25 terminals

It should be noted that, in the present application, the chinese names corresponding to the english letters are as follows:

DCS: a decentralized control system;

IO: inputting and outputting;

D-Sub: d-sub is short for D-subminiature, is a standard of interface shape and structure, is an analog signal interface, and has different interface numbers according to requirements;

DIN connector: a connector standard as defined by the german standard chemical association.

It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.

Claims

1. The connection mode of the IO card element of the DCS hardware and the bus base is characterized in that the IO card element (1) comprises a first card board (11) and a second card board (12), the second card board (12) is a signal processing board, the tops of the first card board (11) and the second card board (12) are communicated and connected through a contact pin, and the bottoms of the first card board and the second card board are fixedly connected through a U-shaped sheet metal part;

the circuit board of the bus base (2) comprises 4 layers, the bottom layer and the top layer are all copper-clad, and double redundant wiring is adopted in the middle two layers;

two ends of the bus base (2) are respectively provided with a D-Sub connector (21) for connecting an IO card or an external CPU in series, and 2 adjacent pins in the D-Sub connectors (21) are defined as the same function; a wiring terminal (22) is arranged on the left side of the bus base (2), and a safety terminal (23) is arranged on the inner side of the wiring terminal (22); the right side of the bus base (2) is provided with at least one power terminal (24); a dial switch (25) for the address of the card is also arranged on the bus base (2);

the bus base (2) is electrically connected with the first clamping plate (11) through a first connector (3), the bus base (2) is electrically connected with the second clamping plate (12) through a second connector (4), the first connector (3) and the second connector (4) are arranged side by side, the first connector (3) and the second connector (4) are DIN connectors, the first connector (3) is used for supplying power to the IO clamping piece (1) and communicating the communication bus with the address bus, the second connector (4) is used for inputting field signals of the IO clamping piece (1), and the field signals comprise two-wire signals and three-wire signals;

when the current of the field signal is more than 0.5A, the field signal directly enters a signal processing board of the IO card element (1) from the wiring terminal (22) through the safety terminal (23); when the current of the field signal is less than 0.5A, the field signal directly enters the bus base (2) from the wiring terminal (22) and then directly enters the signal processing board of the IO card (1).

2. The connection of an IO card of DCS hardware to a bus base according to claim 1, characterized in that said first connector (3) comprises a first plug (31) and a first socket (32), the first socket (32) is mounted on the bus base (2), the first plug (31) is mounted on the first card (11); the second connector (4) comprises a second plug (41) and a second socket (42), the second socket (42) is installed on the bus base (2), and the second plug (41) is installed on the second card board (12).