CN103699049B - PLC On-off signal point expansion module and extended method - Google Patents
PLC On-off signal point expansion module and extended method Download PDFInfo
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Abstract
The present invention provides a kind of PLC On-off signal point expansion module and extended methods, belong to technical field of industrial automatic control, for solving the problems, such as that existing PLC system DI end number extension cost is excessively high.The PLC On-off signal point expansion module includes a cmos analog switch array, cmos analog switch array includes 2n input terminal, n output end and n control terminal, each input terminal is separately connected an equipment end, each output end is separately connected the end DI, each control terminal is connect with the end DO respectively, and control terminal is according to the value control output end at the end DO and connecting/disconnecting for input terminal；Wherein n is positive integer.Using above-mentioned PLC On-off signal point expansion module and extended method, it can achieve and the purpose for doubling the quantity of the acquisition DI signal of PLC is realized with very low cost.
Description
Technical field
The present invention relates to technical field of industrial automatic control, in particular to a kind of PLC On-off signal point expansion module
And extended method.
Background technique
It is well known that programmable controller (PLC) is the electronic system of a digital operation, deposited using programmable
Reservoir stores inside it, can execute the operational orders such as logical operation, sequential control, timing, calculating and arithmetical operation, and lead to
It crosses digital or analog outputting and inputting and controls various types of mechanical or production processes.It is powerful and complicated in order to complete
Engineering needs PLC to have powerful and stable extended capability.
In general, the quantity of the On-off signal point (Digital Input point, the end abbreviation DI) of PLC be it is fixed, and one
A end DI can only acquire the DI signal from an equipment.When designing PLC system, it is spare generally to reserve a little end DI, with
Newly-increased DI signal is acquired when for device upgrade in future.
For the Control Logix series of large-scale PLC system, such as AB, the end DI is generally in the form of DI module
It is inserted on backboard, can be increased the end DI by increasing DI module, but the price of DI module is higher.Moreover, with extension into
There is the inadequate situation of backboard slot in guild, this is to need related upgrading backboard, so that the cost for increasing the end DI further increases.
For the FX2N series of some Medium PLCs, such as Mitsubishi, the end DI is also to be connected in a manner of DI module with PLC,
But there are the upper limits and lower for the end DI number, such as the end the DI upper limit of FX2N series is only 184 points, if therefore the original end DI quantity
If reaching or approaching the upper limit, if to increase the end DI, a whole set of PLC system must be replaced, the cost of PLC system is comparatively
It is higher.
For the FX1N/FN1S series of some small-sized PLC, such as Mitsubishi, the end DI is directly integrated on PLC.It is such
If if PLC need to increase the end DI, it is necessary to replace entire PLC.Not only higher cost in this way, and the transplanting of original control software also can
There is certain difficulty.In addition, PLC older for some models, even if replacing a whole set of PLC system, it is also possible to be closed because can not find
Suitable replacement model and cause system upgrade difficult.
In conclusion the method for the above-mentioned end expansion technique of PLC system DI number, requires higher system upgrade cost, for having
Even there is also generate scaling difficulty because model alternates for a little special PLC systems.
Summary of the invention
It is existing to solve the purpose of the present invention is to provide a kind of PLC On-off signal point expansion module and extended method
PLC system DI end number extends the excessively high problem of cost, under the premise of not changing former PLC system, can be incited somebody to action with lower cost
The end the DI number of former PLC system expands to original 2 times, to reach the end the DI quantity purpose of the expansion technique of PLC system of low cost.
In order to solve the above technical problems, the present invention provides a kind of PLC On-off signal point expansion module, the PLC includes n
A end DI and 1 end DO, the PLC On-off signal point expansion module include a cmos analog switch array, the CMOS
Analog switch array includes 2n input terminal, n output end and n control terminal, and each input terminal is separately connected one
Equipment end, each output end are separately connected the end DI, and each control terminal is connect with the end DO respectively, institute
It states control terminal and connecting/disconnecting for the output end and the input terminal is controlled according to the value at the end DO；Wherein n is positive integer.
Optionally, the PLC further includes 2n buffer, for storing 2n DI signal.
Optionally, the PLC further includes a PLC ground terminal, and the cmos analog switch array further includes CMOS ground connection
End, the PLC ground terminal are connected with the CMOS ground terminal.
Optionally, when the value at the end DO is 0, the control terminal controls input terminal described in each even item respectively with one
A output end connection, and control input terminal described in each odd term and disconnected respectively with the output end；When the end DO
When value is 1, the control terminal controls input terminal described in each even item and disconnects respectively with the output end, and controls each odd number
The item input terminal is connect with an output end respectively.
Optionally, when the value at the end DO is 1, the control terminal controls input terminal described in each even item respectively with one
A output end connection, and control input terminal described in each odd term and disconnected respectively with the output end；When the end DO
When value is 0, the control terminal controls input terminal described in each even item and disconnects respectively with the output end, and controls each odd number
The item input terminal is connect with an output end respectively.
Accordingly the present invention also provides a kind of PLC On-off signal point extended method, include the following steps:
Step 1: a PLC On-off signal point expansion module is provided；
Step 2: starting the PLC, and the 2n buffers are established in the PLC；
Step 3: one, the end DO initial value is given；
Step 4: confirm whether the end DO is initial value:
When the end DO is initial value, firstly, the cmos analog switch array divides the signal of even item equipment end
Supplementary biography passs each end DI, and is respectively stored in buffer described in half；Then, the end DO is negated；
When the end DO is the inverse value of initial value, firstly, the cmos analog switch array is by the equipment of odd term
The signal at end is delivered separately to each end DI, and is respectively stored in the other half described buffer；Then, the main journey of PLC is executed
Sequence；Then, the end DO is negated；And
Step 5: step 4 described in circulating repetition.
In addition, also providing a kind of PLC On-off signal point extended method, include the following steps:
Step 1: a PLC On-off signal point expansion module is provided；
Step 2: starting the PLC, and the 2n buffers are established in the PLC；
Step 3: one, the end DO initial value is given；
Step 4: confirm whether the end DO is initial value:
When the end DO is initial value, firstly, the cmos analog switch array divides the signal of odd term equipment end
Supplementary biography passs each end DI, and is respectively stored in buffer described in half；Then, the end DO is negated；
When the end DO is the inverse value of initial value, firstly, the cmos analog switch array is by the equipment of even item
The signal at end is delivered separately to each end DI, and is respectively stored in the other half described buffer；Then, the main journey of PLC is executed
Sequence；Then, the end DO is negated；And
Step 5: step 4 described in circulating repetition.
Using PLC On-off signal point expansion module of the invention, the PLC includes the n end DI and 1 end DO, institute
Stating PLC On-off signal point expansion module includes a cmos analog switch array, and the cmos analog switch array includes 2n
Input terminal, n output end and n control terminal, each input terminal are separately connected an equipment end, each output end
It is separately connected the end DI, each control terminal is connect with the end DO respectively, and the control terminal is according to the end DO
Value switch the connection of the output end Yu the input terminal；Wherein n is positive integer.As it can be seen that passing through cmos analog switch array
Control terminal switching, the data for the equipment end connecting with 2n input terminal can be passed to the PLC at the only n end DI, with
The input quantity of PLC with the n end DI is extended to 2n by this.And the price of cmos analog switch array will be far below DI mould
The price of block, backboard or PLC.That is, can achieve and realized with very low cost by increasing cmos analog switch array
The purpose that the quantity of the acquisition DI signal of PLC is doubled.
Detailed description of the invention
Fig. 1 is structural schematic diagram of the PLC On-off signal point expansion module in DO=0 in one embodiment of the invention；
Fig. 2 is structural schematic diagram of the PLC On-off signal point expansion module in DO=1 in one embodiment of the invention；
Fig. 3 is the flow diagram of PLC On-off signal point extended method in one embodiment of the invention.
Specific embodiment
Below in conjunction with the drawings and specific embodiments to PLC On-off signal point expansion module proposed by the present invention and extension side
Method is described in further detail.According to following explanation and claims, advantages and features of the invention will be become apparent from.It needs to illustrate
, attached drawing is all made of very simplified form and using non-accurate ratio, only conveniently, lucidly to aid in illustrating originally
The purpose of inventive embodiments.
As shown in Figure 1, the PLC On-off signal point expansion module 100 of one embodiment of the invention, is adopted for expansion technique of PLC 1
The quantity of the DI signal of collection, the PLC 1 include the n end DI and 1 end DO, and wherein n is positive integer.Wherein, the n end DI point
Be not DI1, DI2 ..., DI(n-1), DI n.Here one in the original numerous ends DO PLC 1 can be used in the end DO.
It continues to refer to figure 1, PLC On-off signal point expansion module 100 includes a cmos analog switch array 2, CMOS mould
Quasi- switch arrays 2 include 2n input terminal NO, n output end COM and n control terminal IN, wherein 2n input terminal NO difference
Be NO1, NO2 ..., NO(2n-1), NO2n；N output end COM be respectively COM1, COM2 ..., COM(n-1), COM n；
N control terminal IN be respectively IN1, IN2 ..., IN(n-1), IN n.Each input terminal NO is separately connected an equipment
End, each output end COM are separately connected the end DI of a PLC 1, and each control terminal IN is respectively and described in PLC 1
The connection of the end DO, the control terminal IN can switch the company of the output end COM Yu the input terminal NO according to the value at the end DO
It connects/disconnects.
It continues to refer to figure 1, saves 2n DI signal in PLC to realize, 2n buffer can be created in PLC,
For storing 2n DI signal.In addition, in order to preferably eliminate electrostatic breakdown, it can be by PLC ground terminal and CMOS ground terminal phase
Connection.
Control terminal IN controls connecting/disconnecting for the output end COM and the input terminal NO according to the value at the end DO
Detailed process is as follows:
As shown in Figure 1, when the value at the end DO is 0, each even item input terminal NO2 of control terminal IN control,
NO4 ..., NO2(n-1), NO2n respectively with output end COM1, COM2 ..., COM(n-1), COM n connect, and controls every
A odd term input terminal NO1, NO3 ..., NO(2n+1), NO(2n-1) respectively with the output end COM1, COM2 ...,
COM(n-1), COM n is disconnected；
As shown in Fig. 2, when the value at the end DO is 1, the control terminal IN control each even item input terminal NO2,
NO4 ..., NO2(n-1), NO2n respectively with output end COM1, COM2 ..., COM(n-1), COM n disconnects, and controls every
A odd term input terminal NO1, NO3 ..., NO(2n+1), NO(2n-1) respectively with the output end COM1, COM2 ...,
COM(n-1), COM n connection.
Provide in the present embodiment: when the value at the end DO is 0, the input terminal NO of even item is connect with output end COM, works as DO
The input terminal NO of odd term is connect with output end COM when the value at end is 1.It should be understood that in other embodiments, it can also
Regulation: when the value at the end DO is 1, the input terminal NO of even item is connect with output end COM, and when the value at the end DO is 0, odd term is defeated
Enter to hold NO to connect with output end COM.
Fig. 3 is the flow chart of the PLC On-off signal point extended method of one embodiment of the invention, below with reference to Fig. 1 to figure
3, PLC On-off signal point extended method is described in detail.Specifically comprise the following steps:
Step 1: as shown in Figure 1, providing a PLC On-off signal point expansion module 100；
By each of the cmos analog switch array 2 input terminal NO1, NO2 ..., NO(2n-1), NO2n is separately connected
One equipment end, by each output end COM1, COM2 of cmos analog switch array 2 ..., COM(n-1), COM n respectively with
The end DI DI1, DI2 ..., DI(n-1), DI n connection, and by control terminal IN1, IN2 ..., IN(n-1), IN n respectively with
The end DO of PLC 1 connects.
Step 2: start the PLC, and establish 2n buffer in the PLC；
Step 3: one, the end DO initial value is given；
In the present embodiment, the initial value of DO is 0, it should be appreciated that in another embodiment, initial value may be
1。
Step 4: whether the value for confirming the end DO is initial value:
As shown in Fig. 2, when the end DO is initial value, in the present embodiment, when the end DO is 0, control terminal IN control
Each even item input terminal NO2, NO4 ..., NO2(n-1), NO2n respectively with output end COM1, COM2 ..., COM(n-
1) signal of the equipment end of even item is passed to each end DI with this by, COM n connection, and PLC 1 is by the receiving at each end DI
To even item device signal be stored in half buffer in；After completing storage, then, the end DO is taken
Instead, i.e. DO end value is taken as 1；
As shown in figure 3, when that is, the value at the end DO is 1, control terminal IN control is every when the end DO is the inverse value of initial value
A odd term input terminal NO1, NO3 ..., NO(2n+1), NO(2n-1) respectively with the output end COM1, COM2 ...,
COM(n-1), the signal of the equipment end of odd term is passed to each end DI with this by COM n connection, and PLC 1 is by each end DI
The device signal of the odd term received be stored in the buffer of half；Then, the main program of PLC is executed；Then, to institute
It states the end DO to be negated again, i.e. the value at the end DO is taken as 0.
By step 4, the signal for the equipment end that will just connect respectively with 2n input terminal is arrived by the n end DI storage
The buffer of PLC 1 suffers, and realizes the purpose for receiving 2n equipment end signal with the n port DI.
Step 5: repeating the above steps four, can be stored in the equipment end signal of a 2n new round in PLC 1 again, follow
Ring repeating said steps four, so that it may the equipment end signal being cyclically updated in PLC 1.
It is provided in four the present embodiment the step of: when the end DO is initial value, the device signal of even item being stored in one
In half buffer, and when the end DO is the inverse value of initial value, the device signal of odd term is stored in the temporary of the other half
In device.It should be understood that being may also define that in another embodiment when the end DO is initial value, the equipment of odd term is believed
It number is stored in the buffer of half, and when the end DO is the inverse value of initial value, the device signal of even item is stored in separately
In the buffer of half.
It is well known that the price of cmos analog switch array is far below PLC itself or the price of its DI module, about DI mould
Block price 1 percent, the present invention then only can will originally only by increasing the extremely low cmos analog switch array of a cost
2n DI signal can be received by having the PLC of the n port DI to expand to.In addition, cmos analog switch array is soft as a kind of electronics
Mechanical contact is not present in switch, therefore switch speed is exceedingly fast (tens of to hundreds of nanoseconds), and reliability is high and there is no use the longevity
The limitation of life can use for a long time in industrial settings completely.In addition, the combination of cmos analog switch array and original PLC,
Only need to occupy an end DO of former PLC, the influence to original PLC system is also little.Expand from PLC On-off signal point of the invention
Exhibition method is opened, and in step 4, during double sampling stores device signal, has only carried out a main program, therefore several
The real-time of former PLC system will not be had an impact.
In conclusion can realize under extremely low cost will using PLC On-off signal point expansion module of the invention
The purpose that the quantity of the acquisition DI signal of former PLC doubles, and original PLC system is not influenced substantially.
Foregoing description is only the description to present pre-ferred embodiments, not to any restriction of the scope of the invention, this hair
Any change, the modification that the those of ordinary skill in bright field does according to the disclosure above content, belong to the protection of claims
Range.
Claims (7)
1. a kind of PLC On-off signal point expansion module, the PLC includes the n end DI and 1 end DO, which is characterized in that institute
Stating PLC On-off signal point expansion module includes a cmos analog switch array, and the cmos analog switch array includes 2n
Input terminal, n output end and n control terminal, each input terminal are separately connected an equipment end, each output end
It is separately connected the end DI, each control terminal is connect with the end DO respectively, and the control terminal is according to the end DO
Value control connecting/disconnecting for the output end and the input terminal；Wherein n is positive integer.
2. PLC On-off signal point expansion module as described in claim 1, which is characterized in that the PLC further includes 2n temporary
Storage, for storing 2n DI signal.
3. PLC On-off signal point expansion module as described in claim 1, which is characterized in that the PLC further includes a PLC
Ground terminal, the cmos analog switch array further include a CMOS ground terminal, the PLC ground terminal and the CMOS ground terminal phase
Connection.
4. PLC On-off signal point expansion module as claimed any one in claims 1 to 3, which is characterized in that as the DO
When the value at end is 0, the control terminal controls input terminal described in each even item and connect respectively with an output end, and controls
Input terminal described in each odd term is disconnected with the output end respectively；When the value at the end DO is 1, the control terminal control is every
Input terminal described in a even item respectively with the output end disconnect, and control input terminal described in each odd term respectively with an institute
State output end connection.
5. PLC On-off signal point expansion module as claimed any one in claims 1 to 3, which is characterized in that as the DO
When the value at end is 1, the control terminal controls input terminal described in each even item and connect respectively with an output end, and controls
Input terminal described in each odd term is disconnected with the output end respectively；When the value at the end DO is 0, the control terminal control is every
Input terminal described in a even item respectively with the output end disconnect, and control input terminal described in each odd term respectively with an institute
State output end connection.
6. a kind of PLC On-off signal point extended method, which comprises the steps of:
Step 1: it provides just like PLC On-off signal point expansion module described in any one of claims 1 to 5；
Step 2: start the PLC, and establish 2n buffer in the PLC；
Step 3: one, the end DO initial value is given；
Step 4: confirm whether the end DO is initial value:
When the end DO is initial value, firstly, the cmos analog switch array passes the signal of even item equipment end respectively
Each end DI is passed, and is respectively stored in buffer described in half；Then, the end DO is negated；
When the end DO is the inverse value of initial value, firstly, the cmos analog switch array is by the equipment end of odd term
Signal is delivered separately to each end DI, and is respectively stored in the other half described buffer；Then, the main program of PLC is executed；It connects
, the end DO is negated；And
Step 5: step 4 described in circulating repetition.
7. a kind of PLC On-off signal point extended method, which comprises the steps of:
Step 1: it provides just like PLC On-off signal point expansion module described in any one of claims 1 to 5；
Step 2: start the PLC, and establish 2n buffer in the PLC；
Step 3: one, the end DO initial value is given；
Step 4: confirm whether the end DO is initial value:
When the end DO is initial value, firstly, the cmos analog switch array passes the signal of odd term equipment end respectively
Each end DI is passed, and is respectively stored in buffer described in half；Then, the end DO is negated；
When the end DO is the inverse value of initial value, firstly, the cmos analog switch array is by the equipment end of even item
Signal is delivered separately to each end DI, and is respectively stored in the other half described buffer；Then, the main program of PLC is executed；It connects
, the end DO is negated；And
Step 5: step 4 described in circulating repetition.
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| CN105182966B (en) * | 2015-09-16 | 2017-10-10 | 华锐风电科技(集团)股份有限公司 | A kind of PLC and I/O expansion module detection method |
| CN105204428A (en) * | 2015-11-02 | 2015-12-30 | 中山市中开环保设备制造有限公司 | The expansion circuit and method of the input point of PLC |
| CN108217412B (en) * | 2017-12-18 | 2019-06-21 | 上海新时达电气股份有限公司 | A kind of control system and its building method of escalator |
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| EP0318105A1 (en) * | 1987-11-24 | 1989-05-31 | Telecommunications Radioelectriques Et Telephoniques T.R.T. | Analog circuit for baseband modem |
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