CN205281199U - Redundant field bus IO controlling means - Google Patents

Abstract

The utility model discloses a redundant field bus IO controlling means, including control mainboard, display control board, power supply terminal, switching value incoming signal terminal, switch quantity output signal terminal and communication terminal, the control mainboard includes central processing unit, memory, power source, input interface, output interface, two DP slave station controllers, two optoelectronic isolation circuit, two transceiver circuits, the demonstration mainboard includes presses keyboard, display screen, instruction banks. Two DP slave station interfaces can carry out complete data communication with the main website respectively separately by the control of the DP slave station controller rather than corresponding in this, show through power indicator during the circular telegram, through the state of two DP networks of two pilot lamps demonstrations, measure and the configuration data through showing that screen display shows, but the communication terminal provides plug terminal and DB9 socket dual mode, and the mode of connection is optional. The utility model discloses simple structure, with low costs, reliable stable, the signaling rate is high, has reduced the cable use by a wide margin.

Description

A kind of on site redundant bus I/O control device

Technical field

The utility model relates to fieldbus I/O control techniques field, particularly relates to a kind of on site redundant bus I/O control device.

Background technology

The current on-the-spot electronic equipment such as bus marco such as door, valve system, substantially it is all adopt the band DP of import from the Electrically operated gate of station interface, not only expensive and interface not redundancy, spare parts, maintenance of the equipment etc. simultaneously all has problems, and the control for domestic Electrically operated gate, valve etc., the mode of major part or employing and dcs (DistributedControlSystem, DCS) system hardwire realizes, and cannot directly control corresponding on-the-spot equipment. PROFIBUS-DP bus is one of fieldbus international standard, Ye Shi China first fieldbus national standard, it is made up of three compatible parts: PROFIBUS-DP, ROFIBUS-PA, PROFIBUS-FMS, wherein DP and DecentralizedPeriphery-dispersion is peripheral, PA and ProcessAutomation-process automation, FMS and FieldbusMessageSpecification-fieldbus message specification, PROFIBUS DP is a kind of communication solution of (baud rate is from 9.6Kbit/s to 12Mbit/s) low cost at a high speed, it is usually used in the high-speed data transmission of field layer. the main website cycle ground read from station input information and the cycle to from station send output information. except periodicity user data transmission, PROFIBUS-DP also provides the aperiodicity communication needed for intelligent equipment to carry out configuration, diagnosis and alert process. but, also there is following deficiency in existing fieldbus I/O (I/O) module: one, irredundant interface, it is provided that be all single face, once interface, main website or bus cable occur abnormal, will normal communication, what two, cannot arrange module at scene has related parameter and checks communication state and the I/O situation of module, three, can not carrying out optimum configurations at scene, local operation is tested, and the rly. of module exports the situation tests such as the action with institute's bringing onto load equipment, four, DP takes the mode of DB9 socket and extraneous connects, external communication bus must through T-shaped Bussing connector could and model calling, mode is fixed, inconvenient on-the-spot installation and wiring, five, the rig-site utilization environment of I/O module is comparatively severe, it is possible to have the strong interferers such as high-power electrical equipment and frequency transformer, and communication line process cable testing bridge in may containing the interference of various scenes, anti-interference facility is comprehensive, affects module normal operation, six, poor reliability, communication speed is low, and on-the-spot cable is numerous and diverse, and effect is not good.

Practical novel content

The purpose of this utility model is to solve, by a kind of on site redundant bus I/O control device, the problem that above background section is mentioned.

For reaching this object, the utility model by the following technical solutions:

A kind of on site redundant bus I/O control device, comprises control mainboard, display control board, power supply terminal, On-off signal signal terminal, switching value output signal terminal and communication terminal; Described control mainboard comprises central processing unit, storer, power supply interface, input interface, output interface, two DP from station controller, two photoelectric isolating circuits, two transmitting-receiving circuit; Described display mainboard comprises button group, display screen, pilot lamp group; Described storer, power supply interface, input interface, output interface and two DP connect central processing unit from station controller, described two photoelectric isolating circuits and two DP from corresponding connections of station controller, described two transmitting-receiving circuit corresponding connection two photoelectric isolating circuits; Described power supply terminal, On-off signal signal terminal, switching value output signal terminal, communication terminal are connected with the power supply interface on control mainboard, input interface, output interface, two transmitting-receiving circuit; Described button group, display screen, pilot lamp group connection control mainboard.

Especially, described communication terminal comprises two the three pluggable communication terminals of core and DB9 sockets.

Especially, described control mainboard also comprises reset circuit and dog circuit of guarding the gate, and described reset circuit and dog circuit electrical of guarding the gate connect described central processing unit.

Especially, described DP selects SPC3 chip from station controller; Described transmitting-receiving circuit selects RS485 to receive and dispatch circuit.

Especially, described button group comprises reset button, regulating key, button for subsequent use and setting/confirmation button.

Especially, described display screen selects LCD display screen.

Especially, described pilot lamp group comprises power light and two DP network relay indicating lights.

Especially, it is ten two points that the On-off signal of described On-off signal signal terminal is counted, each input point two terminals, is made up of two groups of each 12 double layers of terminals.

Especially, it is 6 points that the output of described switching value output signal terminal is counted, and often opens contact and a normally closed contact for one that the way of output is the public end of band, and each exports point three terminals, is made up of one group of 18 core double layers of terminals.

The on site redundant bus I/O control device tool that the utility model proposes has the following advantages: one, redundancy interface. Two DP completely independent, that can simultaneously work control from the DP that the station each freedom of interface is corresponding with it from station controller, it is possible to carry out complete data communication with main website respectively, and realize the on off control box state collection to on-the-spot equipment. Two, on-the-spot display and configuration. Shown by power light during energising, and work and the communication state of two DP networks is shown respectively by two DP network relay indicating lights, character can be joined by display screen liquid-crystal display simultaneously, the parameters such as the working order of display measurement and each communication mouth of configuration data and front end, convenient debugging and maintenance, and on-the-spot configuration can be carried out. Meanwhile, the rly. that can be carried out optimum configurations and local operation test, particularly module by button group and display screen at scene exports the situation tests such as the action with institute's bringing onto load equipment, facilitates field adjustable, maintenance and test. Three, wiring mode is enriched. Communication terminal provides pluggable terminal and DB9 socket two kinds of modes simultaneously, can optionally select wiring mode, facilitates on-the-spot installation and wiring. Four, can band multiple devices simultaneously. On-off signal signal terminal, switching value output signal terminal are 6DO/12DI, if the load equipment I/O point connected is few, then can share same module by multiple devices, decrease system cost, have more the advantage of cost performance than the independent equipment carrying total line interface. Five, open strong. Owing to have employed field bus technique, the utility model has good opening, and communications protocol opens completely with disclosed, be highly susceptible to other system particularly DCS network. Six, high anti-jamming capacity and environmental compatibility. In the utility model, I/O adopts the isolation of Phototube Coupling, rly., communication adopt Phototube Coupling, by Optical Fiber Transmission etc., in addition, shielding employs the shielding of communication line, metal chassis shielding, parity checking, the verification of message cumulative sum are used in verification, have very strong environmental adaptation and immunity from interference. The envrionment temperature of the utility model work is-20 DEG C-70 DEG C, and degree of protection is IP56, is therefore applicable to the place that boiler top equitemperature environment is more severe. The utility model structure is simple, and cost is low, reliable and stable, communication rate height, significantly decreases cable and uses, is easy to promote the use of.

Accompanying drawing explanation

The on site redundant bus I/O control device one-piece construction figure that Fig. 1 provides for the utility model embodiment;

The on site redundant bus I/O control device structure block diagram that Fig. 2 provides for the utility model embodiment;

The power supply terminal connections schematic diagram that Fig. 3 provides for the utility model embodiment;

The arrangement of power supply terminal, On-off signal signal terminal, switching value output signal terminal and communication terminal that Fig. 4 provides for the utility model embodiment and entity structure diagram;

The display format schematic diagram of the On-off signal that Fig. 5 provides for the utility model embodiment;

The DP communication interface A state display schematic diagram that Fig. 6 provides for the utility model embodiment;

The DP communication interface B state display schematic diagram that Fig. 7 provides for the utility model embodiment;

Fig. 8 for the utility model embodiment provide non-state is set time display screen display schematic diagram;

Fig. 9 enters display screen display schematic diagram after the state of setting for what the utility model embodiment provided;

Figure 10 arranges schematic diagram for the address of the DP communication interface A that the utility model embodiment provides;

Figure 11 arranges schematic diagram for the address of the DP communication interface B that the utility model embodiment provides.

Embodiment

Below in conjunction with drawings and Examples, the utility model is described in further detail. It should be appreciated that specific embodiment described herein is only for explaining the utility model, but not to restriction of the present utility model. It also should be noted that, for convenience of description, accompanying drawing illustrate only the part relevant to the utility model and not all content, unless otherwise defined, all technology used herein and scientific terminology are identical with belonging to the implication that those skilled in the art of the present utility model understand usually. Term used herein, just in order to describe specific embodiment, is not intended to be restriction the utility model.

Please refer to shown in Fig. 1 and Fig. 2, in the present embodiment, on site redundant bus I/O control device specifically comprises control mainboard (not shown), display control board 101, power supply terminal 102, On-off signal signal terminal 103, switching value output signal terminal 104 and communication terminal 105. Practical application controls mainboard, display control board 101, power supply terminal 102, On-off signal signal terminal 103, switching value output signal terminal 104 and communication terminal 105 be all arranged in metal chassis 106. Described control mainboard comprises central processing unit 201, storer 202, power supply interface 203, input interface 204, output interface 205, display screen interface 206, keystroke interface 207, two DP from station controller 208, two photoelectric isolating circuits 209, two transmitting-receiving circuit 210; Described display mainboard comprises button group, display screen 107, pilot lamp group; Described storer 202, power supply interface 203, input interface 204, output interface 205, display screen interface 206, keystroke interface 207 and two DP connect central processing unit 201 from station controller 208, described two photoelectric isolating circuits 209 and two DP from corresponding connections of station controller 208, described two transmitting-receiving circuit 210 corresponding connection two photoelectric isolating circuits 209; Described power supply terminal 102, On-off signal signal terminal 103, switching value output signal terminal 104, communication terminal 105 are connected with the power supply interface 203 on control mainboard, input interface 204, output 205, two, interface transmitting-receiving circuit 210; Described button group, display screen 107, pilot lamp group connection control mainboard. Described control mainboard also comprises reset circuit and dog circuit of guarding the gate in the present embodiment, and described reset circuit and dog circuit electrical of guarding the gate connect described central processing unit 201. Eeprom chip selected by storer 202, is mainly used in preserving the tributary address (may be the same or different) of two nets being set. Input interface 204 is for collection site equipment feedback signal. Export interface 205 for exporting for rly., it is used for controlling on-the-spot equipment. Display screen interface 206, for connecting display screen 107, carries out parameter setting and data display. Keystroke interface 207, for connecting button group, carries out on-the-spot setting and operation. For needing the scene of collection analog data, it is possible to increase by 1 or 2 road AI interfaces. The group of button described in the present embodiment comprises reset button 108, regulating key 109, button for subsequent use 110 and arranges/confirm button 111, and wherein, reset button 108 represents with " R "; Regulating key 109 comprises rise button and lowers button, represents with " �� " " �� " respectively; Button 110 for subsequent use represents with " * "; Arrange/confirm button 111 to represent with " S ". " S ": when measuring state, presses this key and enters the state of setting. In the state that arranges for confirming key. " ��, �� ": non-state is set time, change displaying contents. When arranging state for revising parameter. " * ": key for subsequent use. " R ": no matter when, press this key and all front end will be resetted. Described display screen 107 selects LCD display screen. Described pilot lamp group comprises power light 112 and two DP network relay indicating lights 113.

In the present embodiment, described DP selects SPC3 chip from station controller 208. described transmitting-receiving circuit 210 selects RS485 to receive and dispatch circuit. SPC3 chip is a kind of for the intelligent interface chip of PROFIUBS-DP opened industrial fieldbus, SPC3 is integrated with complete DP agreement, comprising mode register, status register, interrupt register, various snubber pointer and buffer zone etc., effectively alleviate central processing unit pressure, can be used for 12Mbaud bus. DP from station state machine, to be in fact all PROFIBUS-DP work from power on from station to several the main state phase having to pass through during carrying out circulation data exchange process with main website, this state machine has four states: 1., electrification reset state: after on site redundant bus I/O control device powers on, the DP of two redundancies all enters Power_On state from station controller, at central processing unit, two DP are carried out from station controller necessary optimum configurations and initialize and start DP after the controller of station, DP enters baud rate matching status from station controller, constantly change baud rate so that and the DP main website connected to realize baud rate synchronous, now, if allow change tributary address two terminals (on site redundant bus I/O control device lower right side) short circuit (must before powering on short circuit, otherwise on site redundant bus I/O control device address can not be changed), then can set new tributary address by the debugging software on DP main website or notebook. note: two setting terminal short circuits also re-power rear (disconnection after powering on several seconds, otherwise heavily power on next time and can again enter address setting state), two addresses from station unit all turn into the 126 of acquiescence, no matter whether the address needing two DP interfaces of setting is identical, all should arrange respectively. 2., wait parametrization state: possessed tributary address (read from storer or again set) that user specifies and docking port chip initiation complete and after starting its work, enter from station and wait parametrization state, also it is exactly wait the parametrization message from main website, this message carries part from station operating parameter, after parametrization success, confirmation message is returned from station, due to main website only with carried out data exchange from station by its parametrization, therefore, in fact the object of parametrization is the membership setting up between master-salve station. 3., configuration state is waited: after parametrization, enter from station and wait configuration state, wait and check configuration message, that whether this message audit is grasped with main website from the I/O byte number at station or that GSD file describes identical (configuration data carried in message is the data that main website is expected). 4., data exchange state: after said process completes, main website may send out the message once read from station diagnostic data again, to check from the state that station is current, after confirming to have entered data exchange state from station, then the operation at this station is entered the cycle and exchanges data state by main website, main website constantly to from station write export data (have export data time) obtain simultaneously up-to-date from station input data information. this state is the object state that master-salve station connects, also it is normality state, if because certain reason causes having exited data exchange state from station, then main website is connected with it, at least will from subordinate phase, that is, connection between master-salve station can not be skipped parametrization and configuration stage and directly be entered data exchange.

As shown in Figure 3, the terminal of power supply described in the present embodiment 102 is the 3 pluggable terminals of core, comprises terminal head 301 and terminal base 302, is followed successively by L, N, G from left to right, corresponding to the live wire 303 of acceptable 85-265VAC, zero line 304 and ground wire 305. The power supply of front end is input as alternating current 220V or 110V (power consumption of every platform front end is no more than 5W, scope 85-265V), takies three connection terminals, is followed successively by live wire 303, zero line 304 and ground wire 305. Should noticing that its polarity must indicate one_to_one corresponding with terminal when accessing supply lead, namely live wire 303 should access the terminal that is denoted as " L ", zero line 304 should access the terminal that is denoted as " N ", ground wire 305 should access the terminal being denoted as " G ".

As shown in Figure 4, it is ten two points that the On-off signal of the signal terminal of On-off signal described in the present embodiment 103 is counted, each input point two terminals, it is made up of two groups of each 12 double layers of terminals, terminal number is 1-24, upper strata is odd chanel, and lower floor is even-numbered channels, and upper strata 1,2 is the connection terminal of the 1st way switch amount input; 3,4 is the connection terminal of the 3rd way switch amount input; The rest may be inferred, and 17,18 is the connection terminal of the 11st way switch amount input. Lower floor 7,8 is the connection terminal of the 2nd way switch amount input; 9,10 is the connection terminal of the 4th way switch amount input; The rest may be inferred, and 23,24 is the connection terminal of the 12nd way switch amount input. During wiring, the two ends of input contact are directly accessed the connection terminal of corresponding input point. It is 6 points that the output of described switching value output signal terminal 104 is counted, often open contact and a normally closed contact for one that the way of output is the public end of band, each exports point three terminals, it is made up of one group of 18 core double layers of terminals, terminal number is 25-42,25,26,27 is the connection terminal that the 1st way switch amount exports; 28,29,30 is the connection terminal that the 2nd way switch amount exports; 31,32,33 is the connection terminal that the 3rd way switch amount exports; 34,35,36 is the connection terminal that the 4th way switch amount exports; 37,38,39 is the connection terminal that the 5th way switch amount exports; 40,41,42 is the connection terminal that the 6th way switch amount exports. During wiring, according to the type of contact, respectively load is directly accessed corresponding respective terminal exporting point. With connecing two terminals above when often opening contact, with connecing two terminals next during normally closed contact. Export point for the 1st, when contact is often opened in employing, connect 25,26 terminals, when adopting normally closed contact, connect 26,27 terminals.

Described communication terminal 105 comprises two the three pluggable communication terminals of core and DB9 sockets, is respectively used to connect fieldbus by terminal mode and Bussing connector mode. Generally recommend to adopt conventional terminal connection (being connected to again in terminal after turnover line short circuit), add add-in connectors at the network terminal and terminal resistance switch is allocated to " ON " shelves. Described two three pluggable communication terminals of core and DB9 socket be the DP communication interface A on corresponding control mainboard and DP communication interface B respectively. The corresponding DP network A of DP communication interface A, DP communication interface B and DP network B.

Briefly pilot lamp group, display screen and button group are described below. One, pilot lamp group. Power light prompting power supply is connected. Two DP network relay indicating lights and DPA and DPB are respectively used to network state, represent that DP nets A just in communication when DPA length is bright, represent that DP nets B just in communication when DPB length is bright. Two, display screen. In this enforcement, display screen selects LCD display screen. Non-state is set time, LCD liquid crystal display screen is for showing relevant take off data and communication Interface status, On-off signal and output show respectively, the display format of On-off signal is as shown in Figure 5, what the top of screen showed is the sexadecimal number system data of On-off signal, wherein 1-8 passage byte, 9-12 passage byte (reality nybble, Gao Siwei is fixing to be set to 0). Below screen, what a line showed is the binary data of On-off signal, 1-8 and 9-12 passage is display separately, 8 bit binary data distinguish the scale-of-two value of corresponding 8-1 passage from left to right above, represent when being 1 that input contact closes, representing when being 0 that input contact disconnects, four below are then the binary data of corresponding 12-9 passage. Such as, when 1,5 passages close, when 2,3,4,6,7,8 passages disconnect, corresponding sexadecimal number system data are 11, and scale-of-two is 00010001. When 9,10 passages close, when 11,12 passages disconnect, corresponding sexadecimal number system data are 03, and scale-of-two is 0011 (only display is effectively low four). Displaying contents is by pressing regulating key " ��, �� " key, it is also possible to show following parameter: as shown in Figure 6, DP communication interface A state show, above a line display DP communication interface A address, here is the communication state of DP communication interface A and current baud rate. Communication state is one of four kinds below: Wait_PRM: wait parametrization; Wait_CFG: wait configuration; DATA_EX: data exchange; ERROR: interface is abnormal; When normally running, should continue to keep DATA_EX (data exchange) state. As shown in Figure 7, DP communication interface B state shows, and the display implication of DP communication interface B is the same. Two, measuring state display and operation. As shown in Figure 8, non-state is set time, display screen is for showing relevant take off data and communication Interface status, it is possible to select different displaying contents by pressing " ��, �� " key. The state of setting is entered by " S ". Three, state display and operation are set. A. after entering the state of setting, first showing input password, form is as shown in Figure 9. B. " S " key is pressed after pressing " ��, �� " key input 12, it is possible to the address of DP communication interface A arranging the machine is as shown in Figure 10. Press " ��, �� " key modification address to desired value. C. again pressing " S " key, the address of DP communication interface B arranging the machine is as shown in figure 11. Generally, when the complete redundancy of DP communication interface A and DP communication interface B, identical address value should be arranged to regard to address, under Special Circumstances, it is also possible to different. D. again press " S " key, then preserve the address data just now arranged and return display measurement value state.

In addition, owing to the rig-site utilization environment of this on site redundant bus I/O control device is comparatively severe, may there is the strong interferers such as high-power electrical equipment and frequency transformer, and communication line process cable testing bridge in may containing various scene interference, therefore, the anti-interference measure of on site redundant bus I/O control device is very important, the major measure taked on site redundant bus I/O control device comprises: isolation (I/O: Phototube Coupling, rly. are isolated, communication: Phototube Coupling, by Optical Fiber Transmission etc.); Shielding (shielding of communication line, metal chassis shielding); Verification (parity checking, the verification of message cumulative sum); Except the above-mentioned measure that module itself is taked, also should take following method: position installed by site redundant bus I/O control device should as far as possible away from the strong interferers such as high-power electrical equipment and frequency transformer. Communication line should be forbidden and power cable or the cable parallel lay-up having frequency signal. The shielding wire of communication line must connect and guarantee single-ended ground connection.

The technical solution of the utility model tool has the following advantages: one, redundancy interface. Two DP completely independent, that can simultaneously work control from the DP that the station each freedom of interface is corresponding with it from station controller, it is possible to carry out complete data communication with main website respectively, and realize the on off control box state collection to on-the-spot equipment. Two, on-the-spot display and configuration. Shown by power light during energising, and work and the communication state of two DP networks is shown respectively by two DP network relay indicating lights, character can be joined by display screen liquid-crystal display simultaneously, the parameters such as the working order of display measurement and each communication mouth of configuration data and front end, convenient debugging and maintenance, and on-the-spot configuration can be carried out. Meanwhile, the rly. that can be carried out optimum configurations and local operation test, particularly module by button group and display screen at scene exports the situation tests such as the action with institute's bringing onto load equipment, facilitates field adjustable, maintenance and test. Three, wiring mode is enriched. Communication terminal provides pluggable terminal and DB9 socket two kinds of modes simultaneously, can optionally select wiring mode, facilitates on-the-spot installation and wiring. Four, can band multiple devices simultaneously. On-off signal signal terminal, switching value output signal terminal are 6DO/12DI, if the load equipment I/O point connected is few, then can share same module by multiple devices, decrease system cost, have more the advantage of cost performance than the independent equipment carrying total line interface. Five, open strong. Owing to have employed field bus technique, the utility model has good opening, and communications protocol opens completely with disclosed, be highly susceptible to other system particularly DCS network. Six, high anti-jamming capacity and environmental compatibility. In the utility model, I/O adopts the isolation of Phototube Coupling, rly., communication adopt Phototube Coupling, by Optical Fiber Transmission etc., in addition, shielding employs the shielding of communication line, metal chassis shielding, parity checking, the verification of message cumulative sum are used in verification, have very strong environmental adaptation and immunity from interference. The envrionment temperature of the utility model work is-20 DEG C-70 DEG C, and degree of protection is IP56, is therefore applicable to the place that boiler top equitemperature environment is more severe. The utility model structure is simple, and cost is low, reliable and stable, communication rate height, significantly decreases cable and uses, is easy to promote the use of.

Note, above are only better embodiment of the present utility model and institute's application technology principle. It is understood by those skilled in the art that the utility model is not limited to specific embodiment described here, various obvious change can be carried out for a person skilled in the art, readjust and substitute and protection domain of the present utility model can not be departed from. Therefore, although the utility model being described in further detail by above embodiment, but the utility model is not limited only to above embodiment, when not departing from the utility model and conceive, other equivalence embodiments more can also be comprised, and scope of the present utility model is determined by appended right.

Claims (9)

1. an on site redundant bus I/O control device, it is characterised in that, comprise control mainboard, display control board, power supply terminal, On-off signal signal terminal, switching value output signal terminal and communication terminal; Described control mainboard comprises central processing unit, storer, power supply interface, input interface, output interface, two DP from station controller, two photoelectric isolating circuits, two transmitting-receiving circuit; Described display mainboard comprises button group, display screen, pilot lamp group; Described storer, power supply interface, input interface, output interface and two DP connect central processing unit from station controller, described two photoelectric isolating circuits and two DP from corresponding connections of station controller, described two transmitting-receiving circuit corresponding connection two photoelectric isolating circuits; Described power supply terminal, On-off signal signal terminal, switching value output signal terminal, communication terminal are connected with the power supply interface on control mainboard, input interface, output interface, two transmitting-receiving circuit; Described button group, display screen, pilot lamp group connection control mainboard.

2. on site redundant bus I/O control device according to claim 1, it is characterised in that, described communication terminal comprises two the three pluggable communication terminals of core and DB9 sockets.

3. on site redundant bus I/O control device according to claim 1, it is characterised in that, described control mainboard also comprises reset circuit and dog circuit of guarding the gate, and described reset circuit and dog circuit electrical of guarding the gate connect described central processing unit.

4. on site redundant bus I/O control device according to claim 1, it is characterised in that, described DP selects SPC3 chip from station controller; Described transmitting-receiving circuit selects RS485 to receive and dispatch circuit.

5. on site redundant bus I/O control device according to claim 1, it is characterised in that, described button group comprises reset button, regulating key, button for subsequent use and setting/confirmation button.

6. on site redundant bus I/O control device according to claim 1, it is characterised in that, described display screen selects LCD display screen.

7. on site redundant bus I/O control device according to claim 1, it is characterised in that, described pilot lamp group comprises power light and two DP network relay indicating lights.

8. on site redundant bus I/O control device according to claim 1, it is characterised in that, it is ten two points that the On-off signal of described On-off signal signal terminal is counted, each input point two terminals, is made up of two groups of each 12 double layers of terminals.

9. according to the on site redundant bus I/O control device one of claim 1 to 8 Suo Shu, it is characterized in that, it is 6 points that the output of described switching value output signal terminal is counted, often open contact and a normally closed contact for one that the way of output is the public end of band, each exports point three terminals, is made up of one group of 18 core double layers of terminals.