CN103105798A - Actuator sensor interface (AS-I) high-accuracy analog quantity output module - Google Patents
Actuator sensor interface (AS-I) high-accuracy analog quantity output module Download PDFInfo
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Abstract
The invention discloses an actuator sensor interface (AS-I) high-accuracy analog quantity output module which is composed of a structure piece and anelectrical part. The electrical part is installed inside the structure piece and comprises the following circuits of an AS-I signal filter circuit, an AS-I signal coding and decoding circuit, a module main control circuit, a signal power source separating circuit, a digital analogy switching circuit, a 4-20 mA output circuit, a power source filtering and protection circuit, a sensor power source commutation circuit and the like. An analog quantity slave station mainly achieves that after converted process of numeral signal sent from a bus, the numeral signal is converted to an analog 4-20 mA electric current output signal through a certain interface circuit. Meanwhile, power supply support with a certain load capacity can be offered to a sensor of a lower level by the module so that free changing between an AS-I system power source and an external auxiliary 24V power source can be achieved. The power source circuit has the protection functions of short circuit and current-limiting and the like.
Description
Technical field
The invention belongs to the industrial automatic control field, be specifically related to a kind of AS-i high-precision analog amount output module.
Background technology
In the modern production line on the large-scale instrument and equipment of some factories and miness, in some enterprises, at industrial control field, instrument field etc., usually all need to carry out collection, transmission and the exchange of the various data such as a large amount of digital quantities, analog quantity, system gets operation and control by whole system is completed in processing, analysis, the judgement of these data.How that realizes the processing to analog signals, and bottom analog signals processing module is arisen at the historic moment, and it is responsible for the voltage to various bottoms scene, and the analog signalses such as electric current gather, processing, transmission and output etc.At industrial circle, the analog module kind of being responsible for information processing is a lot, and voltage-type is arranged, current mode, that the input and output type is arranged, also have based on all kinds of bus transfer etc. various types of module, and general precision is not high.The AS-i analog output module is exactly a kind of like this high-precision analog amount output module that comes signal transmission based on new-modernization Industry Control AS-i bus.It is a kind of analog quantity slave station in AS-i bus type module product, and main the realization carried out encoding and decoding with the analog signals of AS-i main frame in the AS-i system, then converts corresponding aanalogvoltage or electric current to and exports, and guarantee system accuracy.With respect to other digital modules of AS-i, it is in coded system, and analog quantity transmission aspect is all comparatively complicated, and therefore that is that all right is ripe for existing AS-i analog output module technology.
Summary of the invention
The present invention seeks to: a kind of analog data output based on the AS-i bus is provided, thereby completes robotization more on-the-spot execution and the control of transmission equipment and AS-i high-precision analog amount output modules of exchanges data.
Technical scheme of the present invention is: a kind of AS-i high-precision analog amount output module comprises:
The AS-i signal filter circuit, the signal that the transmission of AS-i bus is come carries out the filtering processing, removes the harmonious wave interference of noise on the AS-i bus;
AS-i signal codec circuit receives the sine voltage signal on the AS-i number of buses, analyzes packet, and the numerical signal that the AS-i bus is sent separates and passes to the rear class control circuit, sends the slave station desired signal to the AS-i bus simultaneously, returns code and confirms;
The governor circuit module, the data-signal that the AS-i decoding circuit is passed over makes up, and analyzing and processing becomes the actual data that will export with data-switching, passes to digital to analog converter by signal isolation circuit;
Signal isolation circuit realizes the digital signal isolation of governor circuit and D/A converting circuit, and AS-i digital and analog signaling ground is isolated;
The D/A change-over circuit is changed to simulating signal digital signal;
Power module provides stable power supply.
Further, described power module comprises 4-20mA output circuit, power filter and holding circuit and probe power commutation circuit.
Further, described AS-i signal filter circuit comprises that mould controls telefault, resistance, stabilivolt, electric capacity and Transient Suppression Diode, the high-frequency current of controlling on telefault filtering bus by common mode disturbs, and then carrying out low frequency signal filtering by resistance, stabilivolt, electric capacity, the low-frequency current of removing on bus disturbs.
Further, described AS-i signal codec circuit comprises ASI4U chip and accessory circuit thereof.
Further, described governor circuit module comprises singlechip control chip and filtering device.
Further, described signal isolation circuit is two kinds, and a kind of is the buffer circuit that adopts high-speed light lotus root and resistance, electric capacity to consist of; The buffer circuit that the switch power module that another kind is the employing high-performance, ripple is little, protection is complete consists of.
Further, described D/A change-over circuit is 16 DA conversion chips.
Further, described power filter and holding circuit are that TVS pipe, common mode filtering inductance, reverse protection diode, differential mode filter inductance, electric capacity and three ends can be aligned the current-limiting protection circuit that the voltage stabilizer integrated circuit forms.
This analog quantity slave station is mainly realized the numerical signal that the bus transmission is next, after conversion process, then converts numerical signal to simulation 4-20mA current output signal by certain interface circuit.Simultaneously, module provides the power supply support of certain load capacity can for subordinate's sensor, and can realize freely switching between AS-i system power supply and outside auxiliary 24V power supply, and this power circuit possesses the defencive functions such as short circuit and current limliting.
Advantage of the present invention is:
This use is novel converts the signal on the AS-i cable to the voltage signal that the equipment such as sensor and actuator can be identified, and the signal of sensor and actuator is changed into the discernible signal of AS-i main website, and feed back on the AS-i cable, the equipment such as sensor and actuator are able to by AS-i bus and master station communication, realize robotization control.In addition, this module output current resolution is high, and system response speed is fast, and the applied environment temperature is wider, and interference free performance is stronger, and its degree of protection reaches the standard of IP67.
Description of drawings
The invention will be further described below in conjunction with drawings and Examples:
Fig. 1 is AS-i high-precision analog amount output module schematic block circuit diagram of the present invention.
Fig. 2 is the AS-i signal filter circuit.
Fig. 3 is AS-i signal codec circuit.
Fig. 4 is the module governor circuit.
Fig. 5 is signal power source isolation, digital-to-analogue conversion, 4-20mA output circuit theory diagram.
Fig. 6 power filter and holding circuit.
Fig. 7 probe power commutation circuit.
Embodiment
Embodiment: AS-i high-precision analog amount output module as shown in Figure 1 is comprised of structural member and circuit part, and electric part is arranged on structural member inside.Electric part comprises following a few partial circuit: AS-i signal filter circuit, AS-i signal codec circuit, module governor circuit, signal power source buffer circuit, D/A conversion circuit, 4-20mA output circuit, power filter and holding circuit, probe power commutation circuit etc.This analog quantity slave station is mainly realized the numerical signal that the bus transmission is next, after conversion process, then converts numerical signal to simulation 4-20mA current output signal by certain interface circuit.Simultaneously, module provides the power supply support of certain load capacity can for subordinate's sensor, and can realize freely switching between AS-i system power supply and outside auxiliary 24V power supply, and this power circuit possesses the defencive functions such as short circuit and current limliting.After the AS-i signal filtering, signal directly enters AS-i signal codec circuit.AS-i signal codec circuit adopts decoding special chip ASI4U, controls whole signals by it and processes, and sends the data timesharing to governor circuit.Then governor circuit Single-chip Controlling sequential receive data sends the data to the DA converter by signal isolation circuit.The digital quantity that to be the DA converter come the buffer circuit transmission converts voltage signal to and exports to the 4-20mA circuit conversion and become electric current.
AS-i signal filter circuit is as shown in Figure 2 mainly controlled the filtering devices such as telefault, resistance, stabilivolt, electric capacity by common mode and Transient Suppression Diode forms, the high-frequency current of controlling on telefault filtering bus by common mode disturbs, and then by composition low frequency signal filtering such as resistance stabilivolt electric capacity, the low-frequency current of removing on bus disturbs.Transient Suppression Diode is mainly completed the inhibition to the burst transient pulse on bus, and filtered signal directly is transferred to decoding circuit, and settling signal is processed.
AS-i signal codec main circuit as shown in Figure 3 will be comprised of AS-i special chip ASI4U and accessory circuit thereof, at first this chip is realized processing to the confirmation of receipt of AS-i data hardwood signal with to the judgement of waveform fault, then data address and this module's address that receives compared, be confirmed to be with after communicating by letter in this address, then main frame is returned code and confirm, represent that this data receiver is correct.The ASI4U chip will receive the data of coming and directly be assigned to corresponding data line output, pass to governor circuit.
Module master control as shown in Figure 4 is comprised of singlechip control chip and filtering device, and this circuit is being controlled the sequential of the combination of whole system data and data output in conjunction with internal software.Receive the signal transmission of coding-decoding circuit, software is completed processing and the conversion of data according to certain mathematical algorithm, simultaneously, and with data communicating by letter by software simulation mode and analog-digital chip.
Signal power source buffer circuit as shown in Figure 5 mainly comprises two parts, and a part is to realize the isolation of digital signal, is mainly become with discrete set of devices such as resistance capacitances by high-speed light lotus root HCPL0631; Another part is the isolated from power that realizes Digital and analog part, is mainly that, various protections complete switch power module little by high-performance, ripple consists of.By this buffer circuit be mainly prevent harmonic wave that numerical portion and power unit bring mimic channel do around, make more reliable, the stable operation of circuit.
D/A conversion circuit is mainly by high precision, high resolving power, 16 fast DA conversion chips of slewing rate consist of, and main the realization answered the analog quantity voltage signal with the digital quantity photograph that the single-chip microcomputer transmission comes, then as the input of 4-20mA circuit, convert mutually deserved electric current output to by it.
The 4-20mA output circuit mainly is made of little, low elegant, the high precision operating amplifier of imbalance and precision resistance, complete simultaneously the driver output of 4-20mA by the little field effect transistor of temperature drift, this circuit accuracy class is high, working temperature is wide, can reach subzero 25 degrees centigrade to 85 degrees centigrade above freezing, can reach the precision of 0.5 grade in its temperature range.
Power filter as shown in Figure 6 and holding circuit, two parts circuit such as probe power commutation circuit are as shown in Figure 7 managed by TVS respectively; the common mode filtering inductance; the reverse protection diode; the differential mode filter inductance; the current-limiting protection circuit that electric capacity and LM317 form reaches the device compositions such as power supply automatic switchover diode.Power filter and holding circuit realize the interference that power lead and power supply self bring is suppressed, and to guarantee the normal of rear class operating circuit, realize simultaneously the protections such as overcurrent, short circuit; The probe power commutation circuit mainly realizes the automatic switchover of outside auxiliary 24V power supply and AS-i power supply, and power supply mode more flexibly is provided.When outside access accessory power supply, auxiliary 24V is adopted in the sensor power supply, and when auxiliary 24V power supply is cancelled, the AS-I power supply will provide power supply support for sensor.
Above embodiment only is the present invention's a kind of embodiment wherein, and it describes comparatively concrete and detailed, but can not therefore be interpreted as the restriction to the scope of the claims of the present invention.Should be pointed out that for the person of ordinary skill of the art, without departing from the inventive concept of the premise, can also make some distortion and improvement, these all belong to protection scope of the present invention.Therefore, the protection domain of patent of the present invention should be as the criterion with claims.
Claims (8)
1. AS-i high-precision analog amount output module comprises:
The AS-i signal filter circuit, the signal that the transmission of AS-i bus is come carries out the filtering processing, removes the harmonious wave interference of noise on the AS-i bus;
AS-i signal codec circuit receives the sine voltage signal on the AS-i number of buses, analyzes packet, and the numerical signal that the AS-i bus is sent separates and passes to the rear class control circuit, sends the slave station desired signal to the AS-i bus simultaneously, returns code and confirms;
The governor circuit module, the data-signal that the AS-i decoding circuit is passed over makes up, and analyzing and processing becomes the actual data that will export with data-switching, passes to digital to analog converter by signal isolation circuit;
Signal isolation circuit realizes the digital signal isolation of governor circuit and D/A converting circuit, and AS-i digital and analog signaling ground is isolated;
The D/A change-over circuit is changed to simulating signal digital signal;
Power module provides stable power supply.
2. AS-i high-precision analog amount output module according to claim 1, is characterized in that, described power module comprises 4-20mA output circuit, power filter and holding circuit and probe power commutation circuit.
3. AS-i high-precision analog amount output module according to claim 2, it is characterized in that, described AS-i signal filter circuit comprises that mould controls telefault, resistance, stabilivolt, electric capacity and Transient Suppression Diode, the high-frequency current of controlling on telefault filtering bus by common mode disturbs, and then carrying out low frequency signal filtering by resistance, stabilivolt, electric capacity, the low-frequency current of removing on bus disturbs.
4. AS-i high-precision analog amount output module according to claim 2, is characterized in that, described AS-i signal codec circuit comprises ASI4U chip and accessory circuit thereof.
5. AS-i high-precision analog amount output module according to claim 2, is characterized in that, described governor circuit module comprises singlechip control chip and filtering device.
6. AS-i high-precision analog amount output module according to claim 2, is characterized in that, described signal isolation circuit is two kinds, and a kind of is the buffer circuit that adopts high-speed light lotus root and resistance, electric capacity to consist of; The buffer circuit that the switch power module that another kind is the employing high-performance, ripple is little, protection is complete consists of.
7. AS-i high-precision analog amount output module according to claim 2, is characterized in that, described D/A change-over circuit is 16 DA conversion chips.
8. AS-i high-precision analog amount output module according to claim 2; it is characterized in that, described power filter and holding circuit are that TVS pipe, common mode filtering inductance, reverse protection diode, differential mode filter inductance, electric capacity and three ends can be aligned the current-limiting protection circuit that the voltage stabilizer integrated circuit forms.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104581530A (en) * | 2014-12-23 | 2015-04-29 | 福建星网视易信息系统有限公司 | Circuit, device and system for reducing signal noise |
| CN107992023A (en) * | 2017-11-29 | 2018-05-04 | 中核控制系统工程有限公司 | A kind of high precision analog exports self diagnosis redundancy switching circuit |
| CN109933099A (en) * | 2017-12-15 | 2019-06-25 | 中核兰州铀浓缩有限公司 | Uranium enrichment gas centrifuge speed probe output signal processing device |
| CN110955172A (en) * | 2019-10-30 | 2020-04-03 | 中国船舶重工集团公司第七一九研究所 | Electric isolation type 0-20 mA driving circuit with output self-detection function |
| CN112415940A (en) * | 2021-01-25 | 2021-02-26 | 杭州并坚科技有限公司 | Bus master controller, bus communication power supply system and communication power supply method thereof |
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Cited By (6)
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| CN104581530A (en) * | 2014-12-23 | 2015-04-29 | 福建星网视易信息系统有限公司 | Circuit, device and system for reducing signal noise |
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| CN107992023A (en) * | 2017-11-29 | 2018-05-04 | 中核控制系统工程有限公司 | A kind of high precision analog exports self diagnosis redundancy switching circuit |
| CN109933099A (en) * | 2017-12-15 | 2019-06-25 | 中核兰州铀浓缩有限公司 | Uranium enrichment gas centrifuge speed probe output signal processing device |
| CN110955172A (en) * | 2019-10-30 | 2020-04-03 | 中国船舶重工集团公司第七一九研究所 | Electric isolation type 0-20 mA driving circuit with output self-detection function |
| CN112415940A (en) * | 2021-01-25 | 2021-02-26 | 杭州并坚科技有限公司 | Bus master controller, bus communication power supply system and communication power supply method thereof |
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Application publication date: 20130515 |