CN103019147B - Programmable logic controller and expansion module thereof - Google Patents
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Abstract
The invention provides a programmable logic controller and an expansion module of the programmable logic controller. The programmable logic controller comprises an input register, an output register, at least one first input unit, at least one first output unit, at least one second input unit and/or at least one second output unit, wherein the first end of each second input unit is connected with the first end of the corresponding first output unit to be used as an input/output port; the second end of each second input unit is connected with the input register; the second end of each first output unit is connected with the output register; the first end of each second output unit is connected with the first end of the corresponding first input unit to be used as an input/output port; the second end of each second output unit is connected with the output register; and the second end of each first output unit is connected with the input register. The programmable logic controller and the expansion module of the programmable logic controller disclosed by the invention can be flexibly provided with the input/output ports and have high reliability.
Description
Technical field
The present invention relates to Programmable control technology field, particularly a kind of programmable logic controller (PLC) and expansion module thereof.
Background technology
Programmable logic controller (PLC) (Programmable Logic Controller, PLC) is a kind of automatic control device for controlling in real time, and it is widely used in industrial control field.PLC can be divided into Large PLC, Medium PLC and small PLC according to the quantity of its input port and output port.Wherein, in small PLC, also comprise much mini PLC, its port number generally only has several to tens, such as, have the PLC of 8 input ports and 8 output ports, this mini PLC, by the restriction of port number, makes its object that can control relatively less.
Fig. 1 is the register of PLC and the structural representation of I/O unit in prior art, there is shown each I/O unit of PLC and the annexation of register in the prior art, as shown in Figure 1, the input port of PLC and output port are all fixing, and corresponding with the input block of PLC inside and output unit (also claiming input circuit and output circuit) respectively.In some applications, when control object increase to such an extent as to original input port or output port not enough when, often need the load module or the output module that configure expansion, or increase the quantity of PLC.Especially under some specific demands, such as, one is had to the PLC of 8 input ports and 8 output ports, need 10 input ports if on-the-spot, as long as and 5 output ports, now, original input port is not enough needs expansion, and original output port unnecessary cause idle.This not only can increase cost, also can reduce the utilization factor of PLC.Therefore, needing a kind of input port and output port badly can the PLC of flexible configuration and expansion module thereof.
Summary of the invention
The invention provides a kind of programmable logic controller (PLC) and expansion module thereof, for realizing the flexible configuration of programmable logic controller (PLC) input port and output port, thus increasing operation rate.
On the one hand, the invention provides a kind of programmable logic controller (PLC), comprise input register, output register, at least one first input block and at least one the first output unit, also comprise:
At least one second input block, the first end of the first output unit that the first end of each second input block is corresponding with at least one first output unit described respectively connects as input/output end port, second end of described each second input block is connected with described input register, and the second end of each first output unit is connected with described output register; And/or
At least one second output unit, the first end of the first input block that the first end of each second output unit is corresponding with at least one first input block described respectively connects as input/output end port, second end of described each second output unit is connected with described output register, and the second end of each first input block is connected with described input register.
On the other hand, the present invention also provides a kind of expansion module of programmable logic controller (PLC), described expansion module is connected with described programmable logic controller (PLC), for expanding input port and/or the output port of described programmable logic controller (PLC) by the expansion module interface of described programmable logic controller (PLC);
Wherein, described expansion module comprises at least one input block and at least one output unit, and has at least an input block to connect as input/output end port with one end of corresponding output unit in described input block.
As shown from the above technical solution, programmable logic controller (PLC) provided by the invention and expansion module thereof, under the prerequisite not changing port number, by at least one second input block is connected with the first corresponding output unit and the first input block respectively with at least one second output unit, make the one end connected both can be used as input port, also can be used as output port, thus realize the flexible configuration of input port and output port.
Accompanying drawing explanation
Fig. 1 is the register of programmable logic controller (PLC) and the structural representation of I/O unit in prior art;
Fig. 2 is the structural representation of programmable logic controller (PLC) of the present invention;
Fig. 3 be in the first embodiment of programmable logic controller (PLC) of the present invention register and each I/O unit structural representation;
Fig. 4 be in the second embodiment of programmable logic controller (PLC) of the present invention register and each I/O unit structural representation;
Fig. 5 be in the 3rd embodiment of programmable logic controller (PLC) of the present invention register and each I/O unit structural representation;
Fig. 6 be in the 4th embodiment of programmable logic controller (PLC) of the present invention register and each I/O unit structural representation;
Fig. 7 is the structural representation of register, each I/O unit and judging unit in the 5th embodiment of programmable logic controller (PLC) of the present invention.
Embodiment
For making the object of the embodiment of the present invention, technical scheme and advantage clearly, below in conjunction with the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described.It should be noted that, in accompanying drawing or instructions, similar or identical element uses identical Reference numeral.
First be the structural representation of programmable logic controller (PLC) of the present invention with reference to figure 2, Fig. 2.As shown in Figure 2, programmable logic controller (PLC) 1 comprises central processing unit 10, register 11, I/O unit 12 and storer 13.Wherein, central processing unit 10 is connected with register 11, I/O unit 12 and storer 13 respectively, and register 11 is connected with I/O unit 12.Register 11 comprises input register and output register (not shown), and I/O unit 12 comprises at least one input block and at least one output unit.
It should be noted that in addition, in another embodiment, register 11 and storer 13 can also be integrated in central processing unit 10, and register 11 and storer 13 are definition of the different storage spaces to a storage chip.Same, described input register and output register also can be the different demarcations of the storage space to a storage chip.
Particularly, central processing unit 10 is control and calculation process maincenters of programmable logic controller (PLC) 1.When programmable logic controller (PLC) 1 puts into operation, central processing unit 10 receives the data of input block in I/O unit 12 in the mode of scanning, and described data is stored in the input register of register 11.Storer 13 is for storing user program, central processing unit 10 reads described user program one by one from storer 13, and perform described user program according to the data stored in described input register, then the data that execution user program obtains are stored in the output register of register 11.After treating that all user programs are finished, the data to be output in described output register are sent to corresponding output unit, thus complete a control procedure.
Following composition graphs 3-Fig. 6 describes the detailed content of register 11 and I/O unit 12 in programmable logic controller (PLC) of the present invention in detail.
Fig. 3 be in the first embodiment of programmable logic controller (PLC) of the present invention register and each I/O unit structural representation, there is shown each I/O unit of PLC and the annexation of register 11 in the present embodiment, about the module such as central processing unit and storer of PLC is not shown in Figure 3.
As shown in Figure 3, in the present embodiment, PLC comprises register 11, first input block 1, first input block 2 ..., the first input block n, the first output unit 1, first output unit 2 ..., the first output unit n, the second input block 1, second input block 2 ..., the second input block n and the second output unit 1, second output unit 2 ..., the second output unit n.
Particularly, each input block and each output unit are respectively used to modulate the input signal inputted from corresponding port or the output signal that outputs to corresponding port, and play the effect of signal isolation.All optocoupler is comprised in the circuit of described each input block and each output unit, and signal is one-way transmission, that is: each input block is used for the input signal from corresponding port to be input in register 11, and each output unit is used for the output signal from register 11 to output to corresponding port.
Wherein, described register 11 comprises input register and output register (not shown).
The first end of the first input block 1 is connected as input/output end port 1 with the first end of the second output unit 1, second end of the first input block 1 is connected with the input register of register 11, second end of the second output unit 1 is connected with the output register of register 11, and all connect with above-mentioned identical connected mode for the first input block 2 ..., the first input block n and the second output unit 2 ..., the second output unit n, the one end connected is respectively as input/output end port 2, input/output end port 3 ..., input/output end port n.
The first end of the first output unit 1 is connected as input/output end port 1 ' with the first end of the second input block 1, second end of the first output unit 1 is connected with the output register of register 11, second end of the second input block 1 is connected with the input register of register 11, and for the first output unit 2, ..., first output unit n and the second input block 2, ..., second input block n connects with above-mentioned identical connected mode, the one end connected is respectively as input/output end port 2 ', input/output end port 3 ', ..., input/output end port n '.
In the present embodiment, by each first input block is connected as input/output end port with the second corresponding output unit with the second input block with the first end of each first output unit respectively, make each port both also as output port, thus can reach the object of flexible configuration PLC port as input port.Further, user can be configured port by application program, determines which port concrete is as input port, and which port is as output port according to the PLC application scenarios of reality.Described application program write or setting also referred to as port attribute belongs to content well-known to those skilled in the art, so no longer describe in detail herein.
Such as, in figure 3, when input/output end port 1 is configured as input port, input signal is stored in the input register of register 11 by the first input block 1, the central processing unit of PLC can obtain this input signal in the input sample stage, and after the application program of user is finished, in the output refreshing stage, output signal is outputted to output peripheral equipment by pre-configured output port.And in this example, the second output unit 1 is temporarily inoperative.
When application scenarios changes, when needing input/output end port 1 to be used as output port, user only need be configured by corresponding application program.In the input sample stage, central processing unit obtains less than the input signal from the first input block 1 from input register, is equivalent to the first input block 1 temporarily inoperative.And after central processing unit produces output signal, export output signal to output peripheral equipment in the output refreshing stage by the second output unit 1.
In the present embodiment, above-mentioned to described input register read and can by realizing with arranging of forbidding register read-write is enable to writing of described output register.
It should be noted that in addition, in the first embodiment shown in Fig. 3, the number of described second input block is equal with the number of the first output unit, and the number of described second output unit is also equal with the number of the first input block.And in another embodiment, the number of described second input block can be less than the number of described first output unit, the number of described second output unit also can be less than the number of described first input block.
In addition, in another embodiment, the I/O unit of described programmable logic controller (PLC) is except comprising at least one first input block described and at least one first output unit, can also only include at least one second output unit described, and the number of this at least one the second output unit is less than or equal to the number of the first corresponding input block; Or also can only include at least one second input block described, and the number of this at least one the second input block is less than or equal to the number of the first corresponding output unit.In this embodiment, at least one second output unit described or at least one the second input block connect as input/output end port with one end of the first corresponding input block or the first output unit respectively, and the other end is connected with described register respectively.
Next for 8 port PLC, technical scheme of the present invention is described.Fig. 4 be in the second embodiment of programmable logic controller (PLC) of the present invention register and each I/O unit structural representation.Similarly, each I/O unit of PLC and the annexation of register 11 in the present embodiment are shown in Fig. 4, about the module such as central processing unit and storer of PLC is not shown in Figure 4.
In the present embodiment, PLC comprises register 11, first input block 1, first input block 2, first input block 3, first input block 4, first output unit 1, first output unit 2, first output unit 3, first output unit 4, second input block 1, second input block 2, second input block 3, second input block 4 and the second output unit 1, second output unit 2, second output unit 3, second output unit 4.
Wherein, register 11 comprises input register and output register (not shown).
The first end of each first input block connects respectively as input/output end port 1, input/output end port 2, input/output end port 3, input/output end port 4 with the first end of the second corresponding output unit respectively, second end of each first input block is connected with the input register of register 11, and the second end of each second output unit is connected with the output register of register 11.
The first end of each first output unit connects respectively as input/output end port 1 ', input/output end port 2 ', input/output end port 3 ', input/output end port 4 ' with the first end of the second corresponding input block respectively, second end of each first output unit is connected with the output register of register 11, and the second end of each second input block is connected with the input register of register 11.
Visible, in the second embodiment shown in Fig. 4, each first input block and the first output unit are connected with the second corresponding output unit and the second input block, and the port realized is all both can also can as output port as input port.But, in other embodiment of the present invention, can also configure flexibly according to actual needs, make the number of described second input block or the second output unit be less than the number of described first output unit or the first input block respectively.
Such as, in the 3rd embodiment shown in Fig. 5, have 4 ports (input/output end port 1, input/output end port 2, input/output end port 1 ', input/output end port 2 ') both can also can as output port as input port, and other 4 ports (input port 3, input port 4, output port 3 ', output port 4 ') be fixing as 2 input ports and 2 output ports respectively.Specifically, as shown in Figure 5, PLC comprises register 11, first input block 1, first input block 2, first input block 3, first input block 4, first output unit 1, first output unit 2, first output unit 3, first output unit 4, second input block 1, second input block 2 and the second output unit 1, second output unit 2.
Wherein, register 11 comprises input register and output register (not shown).
The respective first end of first input block 1 and the first input block 2 is connected with the second output unit 1 and the respective first end of the second output unit 2 respectively, respectively as input/output end port 1 and input/output end port 2, first input block 1 is connected with the input register of register 11 with the second end of the first input block 2, and the second output unit 1 is connected with the output register of register 11 with the second end of the second output unit 2.
The respective first end of first output unit 1 and the first output unit 2 is connected with the second input block 1 and the respective first end of the second input block 2 respectively, respectively as input/output end port 1 ' and input/output end port 2 ', first output unit 1 is connected with the output register of register 11 with the second end of the first output unit 2, and the second input block 1 is connected with the input register of register 11 with the second end of the second input block 2.
First input block 3 and the respective first end of the first input block 4 are respectively as input port 3 and input port 4, the other end is connected with the input register of register 11, first output unit 3 and the respective first end of the first output unit 4 are respectively as output port 3 ' and output port 4 ', and the other end is connected with the output register of register 11.
In addition, in another embodiment, the I/O unit of described programmable logic controller (PLC) can also only include at least one second output unit, and the number of this at least one the second output unit is less than or equal to the number of the first corresponding input block; Or also can only include at least one second input block, and the number of this at least one the second input block is less than or equal to the number of the first corresponding output unit.
Such as, in the 4th embodiment shown in Fig. 6, have 2 ports (input/output end port 1, input/output end port 2) both can also can as output port as input port, and other ports be fixing as 2 input ports and 4 output ports respectively.Its concrete structure can reference diagram 6, repeats no more herein.
Fig. 7 be in the 5th embodiment of programmable logic controller (PLC) of the present invention register, each I/O unit and judging unit structural representation.Compared with the first embodiment shown in Fig. 3, difference is, in the 5th embodiment, the output signal that the output unit of correspondence sends can also be fed back in input register by each input block, to verify the accuracy that PLC exports.
As shown in Figure 7, to show in PLC except comprising register 11 and each I/O unit, also comprise judging unit 14.
Specifically, in the present embodiment, described feedback signal, except sending except output signal for externally output device, also for generating feedback signal according to described output signal, and is sent to the second input block of correspondence by each first output unit; Each second input block except the input signal for receiving from external input device, also for receive come self-corresponding first output unit send feedback signal.
Similarly, described feedback signal, except sending except output signal for externally output device, also for generating feedback signal according to described output signal, and is sent to the first input block of correspondence by each second output unit; Each first input block except the input signal for receiving from external input device, also for receive come self-corresponding second output unit send feedback signal.
In addition, in the present embodiment, register 11 comprises input register and output register (not shown), and described input register is except for storing except input signal, also for storing described feedback signal, described output register is for storing described output signal.
Whether judging unit 14 is identical for judging output signal corresponding with described feedback signal in feedback signal in described input register and described output register, and judging not identical alarm.Judging unit 14 can be positioned at the central processing unit of PLC, also can be positioned at central processing unit outer and be connected with central processing unit.
Such as, suppose that input/output end port 1 configures as output port by application program by user, in actual moving process, output signal is sent to output peripheral equipment by the second output unit 1 from input/output end port 1 in the output refreshing stage by PLC, simultaneously, second output unit 1 also generates feedback signal according to described output signal, and this feedback signal is sent to the first corresponding input block 1.In the next input sample stage, judging unit 14 can obtain the feedback signal from described first input block 1 from input register, and judge this feedback signal with upper one whether export output signal corresponding to refreshing stage consistent, if judge inconsistent, report to the police, thus can reminding user PLC output error.
It should be noted that herein, PLC is in operational process, because output register can be refreshed at any time in each scan period, therefore, in the input sample stage of each scan period, described judging unit 14 can judge that whether feedback signal is consistent with corresponding output signal.
The expansion module of following description programmable logic controller (PLC) of the present invention.
Described expansion module is connected with described programmable logic controller (PLC), for expanding input port and/or the output port of described programmable logic controller (PLC) by the expansion module interface (i.e. bus interface) of programmable logic controller (PLC).Described programmable logic controller (PLC) can be the programmable logic controller (PLC) above described in composition graphs 2-7, also can be programmable logic controller (PLC) of the prior art.Described expansion module can be common expansion module, also can be the intelligent expansion module comprising the functions such as storage and calculation process.Described expansion module interface is a kind of interface for carrying out ports-Extending for programmable logic controller (PLC) that this area is commonly used, and no longer describes in detail herein.
In embodiments of the present invention, described expansion module comprises at least one input block and at least one output unit, and have at least an input block to connect the input/output end port as expanding with one end of corresponding output unit in described input block, or it is corresponding, have at least an output unit to connect the input/output end port as expanding with one end of corresponding input block in described output unit, other input block and/or output unit be the fixing input port as expansion and output port respectively.Wherein, described input block is identical with the function of output unit with the input block of programmable logic controller (PLC) mentioned above respectively with the function of output unit, so repeat no more herein.
In sum, programmable logic controller (PLC) provided by the invention and expansion module thereof, under the prerequisite not changing port number, by at least one second input block is connected with the first corresponding output unit and the first input block respectively with at least one second output unit, make the one end connected both can be used as input port, also can be used as output port, thus realize the flexible configuration of input port and output port.In addition, by being connected with output unit by input block, make described input block to be used for feedback loop output signal, thus make central processing unit can judge that whether output is successful according to the signal of feedback, thus improve the reliability of PLC.
Last it is noted that above embodiment is only in order to illustrate technical scheme of the present invention, be not intended to limit; Although with reference to previous embodiment to invention has been detailed description, those of ordinary skill in the art is to be understood that: it still can be modified to the technical scheme described in previous embodiment, or carries out equivalent replacement to wherein portion of techniques feature; And these amendments or replacement, do not make the essence of appropriate technical solution depart from the spirit and scope of various embodiments of the present invention technical scheme.
Claims (4)
1. a programmable logic controller (PLC), comprise input register, output register, at least one first input block and at least one the first output unit, it is characterized in that, described programmable logic controller (PLC) also comprises:
At least one second input block, the first end of the first output unit that the first end of each second input block is corresponding with at least one first output unit described respectively connects as input/output end port, second end of described each second input block is connected with described input register, and the second end of each first output unit is connected with described output register; And/or
At least one second output unit, the first end of the first input block that the first end of each second output unit is corresponding with at least one first input block described respectively connects as input/output end port, second end of described each second output unit is connected with described output register, and the second end of each first input block is connected with described input register;
Described first output unit is used for externally output device and sends output signal, and generates feedback signal according to described output signal, described feedback signal is sent to the second input block corresponding to described first output unit;
Described second input block for receiving the input signal from external input device, and receives the feedback signal sent from the first output unit that described second input block is corresponding;
Described second output unit is used for externally output device and sends output signal, and generates feedback signal according to described output signal, described feedback signal is sent to the first input block corresponding to described second output unit;
Described first input block for receiving the input signal from external input device, and receives the feedback signal sent from the second output unit that described first input block is corresponding;
Described input register is for storing described input signal and feedback signal;
Described output register is for storing described output signal.
2. programmable logic controller (PLC) according to claim 1, is characterized in that,
The number of described second input block is less than or equal to the number of described first output unit.
3. programmable logic controller (PLC) according to claim 1 and 2, is characterized in that,
The number of described second output unit is less than or equal to the number of described first input block.
4. programmable logic controller (PLC) according to claim 1, is characterized in that, described programmable logic controller (PLC) also comprises:
Judging unit, whether identical for judging output signal corresponding with described feedback signal in feedback signal in described input register and described output register, and judging not identical alarm.
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