CN104820394A - System for driving multivariable instrument by use of PLC digital output module - Google Patents
System for driving multivariable instrument by use of PLC digital output module Download PDFInfo
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- CN104820394A CN104820394A CN201510116119.XA CN201510116119A CN104820394A CN 104820394 A CN104820394 A CN 104820394A CN 201510116119 A CN201510116119 A CN 201510116119A CN 104820394 A CN104820394 A CN 104820394A
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- G—PHYSICS
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- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
- G05B19/05—Programmable logic controllers, e.g. simulating logic interconnections of signals according to ladder diagrams or function charts
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Abstract
The invention discloses a system for driving a multivariable instrument by use of a PLC digital output module. The system comprises a driving apparatus and multiple digital display instruments; the driving apparatus comprises multiple digital display instrument engineering work load calculating modules, a circulating addressing function module, a BCD code conversion and enablement position control module and the PLC digital output module; the multiple digital display instrument engineering work load calculating modules are used for calculating the engineering work load of the multiple digital display instruments; the circulating addressing function module is used for selecting the digital display instrument engineering work load calculating modules; the BCD code conversion and enablement position control module is used for controlling enablement positions and converting calculation results into BCD codes; the PLC digital output module is used for outputting the BCD codes; and the multiple digital display instruments are used for converting the BCD codes into display results and displaying the display results. The system provided by the invention is low in cost and high in reliability, and can drive numerous digital display instruments simply by use of a few PLC digital output modules.
Description
Technical field
The present invention relates to PLC (programmable logic controller (PLC), Programmable Logic Controller) control technology field, be specifically related to the system that a kind of PLC digital output module drives multivariate instrument.
Background technology
Drive in the technology of read out instrument at existing employing PLC, usual employing PLC analog output module drives read out instrument, but a PLC analog output module at most also only has 8 passages, if there is the situation that the read out instrument needing to drive is more, then must there is more PLC analog output module.In addition, compared with driving read out instrument with employing PLC digital output module, adopt PLC analog output module to drive the cost of read out instrument higher, on the one hand, the price of the PLC digital output module that the cost ratio of PLC analog output module is common is much high; On the other hand, PLC analog module must adopt the mode of shielding control cables to connect read out instrument, not only increases cost, again limit the mode connecting read out instrument.
Summary of the invention
Goal of the invention of the present invention is the defect for prior art, provide the system that a kind of PLC digital output module drives multivariate instrument, for solving in prior art the problem adopting PLC analog output module to drive the cost of read out instrument read out instrument that is high, that drive less.
The invention provides the system that a kind of PLC digital output module drives multivariate instrument, comprising: drive unit and multiple read out instrument; Drive unit comprises: the conversion of multiple read out instrument quantities calculation module, cyclic addressing functional module, binary-coded decimal and enable bit control module and PLC digital output module; Multiple read out instrument quantities calculation module, for calculating the quantities of multiple read out instrument; Multiple read out instrument quantities calculation module and multiple read out instrument one_to_one corresponding, each read out instrument quantities calculation module obtains a result of calculation; Cyclic addressing functional module and multiple read out instrument quantities calculation model calling, for selecting read out instrument quantities calculation module; Binary-coded decimal conversion and enable bit control module are connected with cyclic addressing functional module, for controlling enable bit and result of calculation being converted to binary-coded decimal; PLC digital output module changes with binary-coded decimal and enable bit control module is connected, for exporting binary-coded decimal; Multiple read out instrument is connected with PLC digital output module, for binary-coded decimal being converted to display result and showing.
Further, PLC digital output module comprises: N number of data bit interface and M enable bit interface; Each read out instrument is connected with N number of data bit interface, and is connected with an enable bit interface in M.
Further, when the output of enable bit interface is the first numerical value, the read out instrument be connected with enable bit interface upgrades and shows result; When the output of enable bit interface is second value, the read out instrument be connected with enable bit interface keeps original display result constant.
Further, be the first numerical value in the output of a synchronization enable bit interface at the most.
Further, read out instrument is the read out instrument of display position, X position, and display result is the decimal system, and every four data bit interfaces show position with in the X position in read out instrument and are connected; Wherein, N equals 4*X.
Further, display position comprises sign bit and digit order number, or display position is digit order number.
PLC digital output module provided by the invention drives the system of multivariate instrument, is changed and enable bit control module, make PLC digital output module drive multiple read out instrument by cyclic addressing functional module and binary-coded decimal.PLC digital output module provided by the invention drives the system cost of multivariate instrument low, and reliability is high, and only needs a small amount of PLC digital output module just can drive a large amount of read out instruments.
Accompanying drawing explanation
Fig. 1 is the structural representation that PLC digital output module provided by the invention drives the system embodiment one of multivariate instrument;
Fig. 2 is the structural representation that PLC digital output module provided by the invention drives the system embodiment two of multivariate instrument;
Fig. 3 is the output interface of PLC digital output module and the connection diagram of read out instrument in embodiment two provided by the invention.
Embodiment
For fully understanding the object of the present invention, feature and effect, by following concrete embodiment, the present invention is elaborated, but the present invention is not restricted to this.
Fig. 1 is the structural representation that PLC digital output module provided by the invention drives the system embodiment one of multivariate instrument, and as shown in Figure 1, this system comprises: drive unit and multiple read out instrument 105.This drive unit comprises: the conversion of multiple read out instrument quantities calculation module 101, cyclic addressing functional module 102, binary-coded decimal and enable bit control module 103 and PLC digital output module 104.
Wherein, multiple read out instrument quantities calculation module 101 is for calculating the quantities of multiple read out instrument 105, multiple read out instrument quantities calculation module 101 and multiple read out instrument 105 one_to_one corresponding, each read out instrument quantities calculation module 101 obtains a result of calculation.Particularly, when read out instrument 105 is 8, these 8 read out instruments can be respectively PB1 ~ PB8 read out instrument, due to read out instrument quantities calculation module 101 and read out instrument 105 one_to_one corresponding, so read out instrument quantities calculation module 101 is also 8, and be respectively PB1 ~ PB8 read out instrument quantities calculation module.Wherein, PB1 read out instrument quantities calculation module is corresponding with PB1 read out instrument, and namely the result of calculation of PB1 read out instrument quantities calculation module is PB1 read out instrument; PB2 read out instrument quantities calculation module is corresponding with PB2 read out instrument, and namely the result of calculation of PB2 read out instrument quantities calculation module is PB2 read out instrument, by that analogy.
Cyclic addressing functional module 102 is connected with multiple read out instrument quantities calculation module 101, for selecting read out instrument quantities calculation module 101.Particularly, such as when the cyclic addressing cycle of cyclic addressing functional module is 50ms, what first 50ms cyclic addressing functional module was selected is PB1 read out instrument quantities calculation module, what second 50ms cyclic addressing functional module was selected is PB2 read out instrument quantities calculation module, by that analogy.
Binary-coded decimal conversion and enable bit control module 103 are connected with cyclic addressing functional module 102, for controlling enable bit and result of calculation being converted to binary-coded decimal.Particularly, such as when the cyclic addressing cycle of cyclic addressing functional module 102 is 50ms, what first 50ms cyclic addressing functional module 102 was selected is PB1 read out instrument quantities calculation module, binary-coded decimal conversion and enable bit control module 103 control its enable bit, and the result of calculation of PB1 read out instrument quantities calculation module is converted to binary-coded decimal.
PLC digital output module 104 changes with binary-coded decimal and enable bit control module 103 is connected, for exporting binary-coded decimal.Multiple read out instrument 105 is connected with PLC digital output module 104, for binary-coded decimal being converted to display result and showing.
The output interface of the display data being used for transmission of digital Displaying Meter 105 in PLC digital output module 104 is defined as data bit interface by the present invention, and the output interface being used for transmitting enable bit data in PLC digital output module 104 is defined as enable bit interface.Wherein, PLC digital output module 104 comprises: N number of data bit interface and M enable bit interface.Each read out instrument 105 is connected with N number of data bit interface, and is connected with an enable bit interface in M.That is, PLC digital output module 104 can drive M read out instrument 105.When the output of enable bit interface is the first numerical value, the read out instrument 105 that the enable bit interface being the first numerical value with this output is connected upgrades and shows result; When the output of enable bit interface is second value, the read out instrument 105 that the enable bit interface being second value with this output is connected keeps original display result constant.It should be noted that in the output of a synchronization enable bit interface be at the most the first numerical value, thus make synchronization at the most a read out instrument 105 upgrade display result, realize the effective driving to multiple read out instrument 105.
Particularly, such as, the first setting value is 1, and second value is set as 0.When the cyclic addressing cycle of cyclic addressing functional module 102 is 50ms, what first 50ms cyclic addressing functional module 102 was selected is PB1 read out instrument quantities calculation module, binary-coded decimal conversion and enable bit control module 103 control its enable bit, and the result of calculation of PB1 read out instrument quantities calculation module is converted to binary-coded decimal, now, be 1 with the output of the enable bit interface of PB1 digital indicator list catenation, then binary-coded decimal is converted to display result and shows by PB1 read out instrument.What second 50ms cyclic addressing functional module 102 was selected is PB2 read out instrument quantities calculation module, binary-coded decimal conversion and enable bit control module 103 control its enable bit, and the result of calculation of PB2 read out instrument quantities calculation module is converted to binary-coded decimal, now, be 0 with the output of the enable bit interface of PB2 digital indicator list catenation, then PB2 read out instrument keeps original display result constant.
Read out instrument 105 is the read out instrument of display position, X position, and when display result is the decimal system, every four the data bit interfaces in PLC digital output module 104 show position with in the X position in read out instrument 105 and are connected.Wherein, N equals 4*X.Display position comprises sign bit and digit order number, or display position is digit order number, that is read out instrument 105 for not only having sign bit but also having the read out instrument of digit order number, also for not have sign bit, can only have the read out instrument of digit order number.
The system of multivariate instrument is driven to be described below by specific embodiment to PLC digital output module provided by the invention.
Fig. 2 is the structural representation that PLC digital output module provided by the invention drives the system embodiment two of multivariate instrument, and as shown in Figure 2, this system comprises: drive unit and multiple read out instrument.This drive unit comprises: the conversion of multiple read out instrument quantities calculation module, cyclic addressing functional module 202, binary-coded decimal and enable bit control module 203 and PLC digital output module 204.
What in the present embodiment, PLC digital output module 204 adopted is the common PLC digital output module with 32 output interfaces, what need driving is 6 read out instruments showing positions, wherein 6 display positions comprise: 1 sign bit and 5 digit order numbers, be respectively positive and negative position, very much position, thousand points of positions, hundredths, tenths and individual point of positions.Each read out instrument also needs to have the enable bit tie point be connected with enable bit interface.Each read out instrument also needs to be connected with power supply, and the power supply of each display position in read out instrument obtains power supply by read out instrument internal parallel.
Due to PLC digital output module 204 output is binary-coded decimal, so each display position of read out instrument all needs 4 data bit interfaces, therefore the read out instrument of 6 display positions has needs 24 data bit interfaces altogether, and each read out instrument and this 24 data bit interfaces are connected.Have in the PLC digital output module 204 of 32 output interfaces and have 24 output interfaces to be used as data bit interface, so remaining 8 output interfaces can be used as enable bit interface, each read out instrument is connected with the enable bit interface of 1 in 8, therefore 8 read out instruments can be driven, these 8 read out instruments are respectively PB1 ~ PB8 read out instrument 2051 ~ 2058, and 8 the read out instrument quantities calculation modules corresponding with these 8 read out instruments are respectively PB1 ~ PB8 read out instrument quantities calculation module 2011 ~ 2018.PB1 ~ PB8 read out instrument quantities calculation module 2011 ~ 2018 can calculate respectively to the result of PB1 ~ PB8 read out instrument 2051 ~ 2058.
In the present invention, the output interface of PLC digital output module and the concrete method of attachment of read out instrument can set according to actual needs, are not specifically limited herein.Such as, 32 output interfaces of PLC digital output module are respectively DO1.1 ~ DO1.32, Fig. 3 is the output interface of PLC digital output module and the connection diagram of read out instrument in embodiment two provided by the invention, Fig. 3 illustrate only the connection diagram of the output interface of PLC digital output module and PB1 read out instrument 2051, PB2 read out instrument 2052, and the output interface of PLC digital output module and the annexation of PB3 ~ PB8 read out instrument are similarly.Particularly, DO1.1 ~ DO1.24 in PLC digital output module can be made as data bit interface, make DO1.25 ~ DO1.32 as enable bit interface, particularly, DO1.1 ~ DO1.4 is connected with the positive and negative position of each read out instrument, is responsible for the positive and negative position driving each read out instrument; DO1.5 ~ DO1.8 is connected with the position very much of each read out instrument, is responsible for the position very much driving each read out instrument; DO1.9 ~ DO1.12 is connected with thousand points of positions of each read out instrument, is responsible for the thousand points of positions driving each read out instrument; DO1.13 ~ DO1.16 is connected with the hundredths of each read out instrument, is responsible for the hundredths driving each read out instrument; DO1.17 ~ DO1.20 is connected with the tenths of each read out instrument, is responsible for the tenths driving each read out instrument; DO1.21 ~ DO1.24 is connected with a point position for each read out instrument, is responsible for point position driving each read out instrument; DO1.25 ~ DO1.32 is connected with the enable bit tie point of each read out instrument respectively, is responsible for the enable bit driving each read out instrument.
When the output of enable bit interface is the first numerical value, the read out instrument be connected with enable bit interface upgrades and shows result; When the output of enable bit interface is second value, the read out instrument be connected with enable bit interface keeps original display result constant.Be the first numerical value in the output of a synchronization enable bit interface at the most, thus realize the effective driving to multiple read out instrument.
Such as, when the first setting value is 1, when second value is set as 0, when the output of the enable bit interface be connected with PB1 read out instrument 2051 is 1, then binary-coded decimal is converted to display result and shows by PB1 read out instrument 2051; When the output of the enable bit interface be connected with PB2 read out instrument 2052 is 0, then PB2 read out instrument 2052 keeps original display result constant.Particularly, such as DO1.21=0, DO1.22=1, DO1.23=0, DO1.24=1, then the binary-coded decimal represented on point position that PLC digital output module 204 exports is 0101, when to show result be the decimal system, then the individual point position of representative display result is 5.The transmission of other digit order numbers of display result and transfer principle are similarly.
If what PLC digital output module still adopted is the common PLC digital output module with 32 output interfaces, what need driving is 4 read out instruments showing positions, wherein 4 display positions are 4 digit order numbers, are respectively thousand points of positions, hundredths, tenths and individual point of position.According to the content of embodiment two, 16 output interfaces in PLC digital output module are now needed altogether to be used as data bit interface, so remaining 16 output interfaces can be used as enable bit interface, each read out instrument is connected with the enable bit interface of 1 in 16, therefore only needs 1 PLC digital output module just can drive 16 read out instruments.
If what PLC digital output module still adopted is the common PLC digital output module with 32 output interfaces, what need driving is 3 read out instruments showing positions, wherein 3 display positions comprise: 1 sign bit and 2 digit order numbers, be respectively positive and negative position, tenths and individual point of position.According to the content of embodiment two, 12 output interfaces in PLC digital output module are now needed altogether to be used as data bit interface, so remaining 20 output interfaces can be used as enable bit interface, each read out instrument is connected with the enable bit interface of 1 in 20, therefore only needs 1 PLC digital output module just can drive 20 read out instruments.
Drive the system of multivariate instrument according to PLC digital output module provided by the invention, changed and enable bit control module by cyclic addressing functional module and binary-coded decimal, make PLC digital output module drive multiple read out instrument.PLC digital output module provided by the invention drives the system cost of multivariate instrument low, and reliability is high, and only needs a small amount of PLC digital output module just can drive a large amount of read out instruments.
Finally; what enumerate it is to be noted that above is only specific embodiments of the invention; certain those skilled in the art can change and modification the present invention; if these amendments and modification belong within the scope of the claims in the present invention and equivalent technologies thereof, protection scope of the present invention all should be thought.
Claims (6)
1. drive a system for multivariate instrument with PLC digital output module, it is characterized in that, comprising: drive unit and multiple read out instrument;
Described drive unit comprises: the conversion of multiple read out instrument quantities calculation module, cyclic addressing functional module, binary-coded decimal and enable bit control module and PLC digital output module;
Described multiple read out instrument quantities calculation module, for calculating the quantities of described multiple read out instrument; Described multiple read out instrument quantities calculation module and described multiple read out instrument one_to_one corresponding, each read out instrument quantities calculation module obtains a result of calculation;
Described cyclic addressing functional module and described multiple read out instrument quantities calculation model calling, for selecting described read out instrument quantities calculation module;
Described binary-coded decimal conversion and enable bit control module are connected with described cyclic addressing functional module, for controlling enable bit and described result of calculation being converted to binary-coded decimal;
Described PLC digital output module changes with described binary-coded decimal and enable bit control module is connected, for exporting described binary-coded decimal;
Described multiple read out instrument is connected with described PLC digital output module, for described binary-coded decimal being converted to display result and showing.
2. PLC digital output module according to claim 1 drives the system of multivariate instrument, and it is characterized in that, described PLC digital output module comprises: N number of data bit interface and M enable bit interface;
Each read out instrument is connected with N number of data bit interface, and is connected with an enable bit interface in M.
3. PLC digital output module according to claim 2 drives the system of multivariate instrument, it is characterized in that, when the output of described enable bit interface is the first numerical value, the described read out instrument be connected with described enable bit interface upgrades described display result; When the output of described enable bit interface is second value, the described read out instrument be connected with described enable bit interface keeps original display result constant.
4. PLC digital output module according to claim 3 drives the system of multivariate instrument, it is characterized in that, is described first numerical value in the output of a synchronization enable bit interface at the most.
5. PLC digital output module according to claim 2 drives the system of multivariate instrument, it is characterized in that, described read out instrument is the read out instrument of display position, X position, described display result is the decimal system, and every four data bit interfaces show position with in the X position in described read out instrument and are connected; Wherein, N equals 4*X.
6. PLC digital output module according to claim 5 drives the system of multivariate instrument, and it is characterized in that, described display position comprises sign bit and digit order number, or described display position is digit order number.
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