JP2009230722A - Counter system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To attain count processing using many input signals. <P>SOLUTION: In configuration including a central processing unit 1 and a detector 2, a detection part 21 of the detector 2 detects predetermined edges of the input signals S1-Sn input via a plurality of input ports 20 as effective edges according to a count processing system by each of the input signals S1-Sn. A communication control part 23 transmits information about the effective edges from a sub side input/output interface 22 to the central processing unit 1. A communication control part 11 of the central processing unit 1 receives the information about the effective edges from a main side input/output interface 10. A count part 12 performs the count processing according to the count processing system using the effective edges detected by the detection part 21 to update a count value. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a counter system for obtaining a count value using different input signals.

  A counter for obtaining a count value is used in various applications such as a PLC that performs device control. For example, in the case of an automatic elevator, control is performed so as to increase upward as the count value by the counter increases. In the case of a rotary motor, the counter controls the number of rotations of the motor by incrementing the count value by one for each rotation.

  Conventionally, the central processing unit has all the functions of the counter (for example, see Patent Document 1). For example, as shown in FIG. 11, the central processing unit 7 is connected to input lines L1 to Ln to which different input signals S1 to Sn are transmitted, and uses the input signals S1 to Sn to perform preset count processing. Count processing is performed according to a method (input method) to obtain a count value.

  As shown in FIG. 12, the count processing method includes a single-phase input method (FIG. 12 (a)), a two-phase input method (FIG. 12 (b)), an individual input method (FIG. 12 (c)), and a direction. There is a discrimination input method (FIG. 12D).

  As shown in FIG. 12A, the single-phase input method is a method in which the count value is incremented by one every time a rising edge (or falling edge) of one input signal is detected.

  As shown in FIG. 12B, the two-phase input method is a method of counting using two input signals, and when one (A phase) input signal is in an OFF state, the other (B phase). When the falling edge of the input signal is detected, the count value is increased by 1. When the rising edge of the B-phase input signal is detected, the count value is decreased by 1. When the A-phase input signal is in the ON state, the edge of the B-phase input signal is not detected.

  The individual input method is a method of counting using two input signals as shown in FIG. 12 (c), and when the rising edge of one (A phase) input signal is detected, the count value is increased by 1, When the rising edge of the other (B phase) input signal is detected, the count value is counted so as to be reduced by one.

The direction discrimination method is a method of counting using two input signals as shown in FIG. 12 (d). When a rising edge of one (A phase) input signal is detected, the other (B phase) is detected. ) Is incremented by 1 when the input signal is off, and the count value is decremented by 1 when the B-phase input signal is on.
JP 2001-216155 A

  However, since the conventional central processing unit 7 is connected to many devices such as SRAM, FROM, input / output lines, communication lines, and expansion buses, the input signals S1 to Sn necessary for the count process are transmitted. Many lines L1 to Ln could not be connected. For this reason, the conventional central processing unit 7 cannot realize count processing using a large number of input signals.

  The present invention has been made in view of the above points, and an object of the present invention is to provide a counter system capable of realizing count processing using a large number of input signals.

  The invention of claim 1 includes a central processing unit that performs processing using a count value obtained by performing count processing on an input signal of a binary signal according to a count processing method, and input signals of different binary signals are A plurality of input ports to which input lines to be transmitted are respectively connected; detection means for detecting a valid edge of the input signal for each input signal input via the plurality of input ports; and the central processing unit; A first communication control unit that communicates with each other, and the central processing unit includes a second communication control unit that performs communication with the detection unit, and the central processing unit Alternatively, in any of the detection devices, the information on the effective edge corresponding to a preset count processing method is acquired for each input signal, and the preset count processing method is used. Therefore, it characterized in that counting means are provided for updating the count value by performing the counting process.

  According to a second aspect of the present invention, in the first aspect of the invention, there is provided a setting means for selecting one count processing method from a plurality of types of count processing methods, and the counting means is a counter process set by the setting means. Counting processing is performed according to a method.

  According to a third aspect of the present invention, in the first aspect of the present invention, the input time constant is a time from when the detecting means detects an edge of the input signal until a certain level is continued and the edge is taken as the effective edge. It is characterized by comprising setting means for setting.

  According to a fourth aspect of the present invention, there is provided a setting means for setting a start value of the count value according to the first aspect of the invention, and the count means counts the count value from the start value of the count value set by the setting means. Processing is started.

  According to a fifth aspect of the present invention, in the first aspect of the invention, there is provided setting means for setting an end value of the count value, and the count means reaches the end value when the count value set by the setting means is reached. The count processing is performed until the above.

  The invention of claim 6 is the invention according to any one of claims 2 to 5, wherein the setting means is provided in the central processing unit.

  The invention according to claim 7 is the invention according to any one of claims 2 to 5, further comprising a switch having the setting means and connected to the detection device, wherein the detection device is set by the setting means. The setting content is received from the switch.

  The invention according to claim 8 is characterized in that, in the invention according to claim 5, when the count means reaches the end value by the counting means, notification means is provided for notifying other devices.

  The invention according to claim 9 is the invention according to claim 8, wherein the detection device includes the counting unit and the notification unit, and the notification unit notifies the central processing unit.

  The invention of claim 10 comprises the external device connected to the detection device according to the invention of claim 8, wherein the detection device has the counting means and the notification means, and the notification means It is characterized by notifying an external device.

  According to an eleventh aspect of the present invention, in the invention according to any one of the first to eighth aspects, the counting means is provided in the central processing unit, and the detecting device is configured to detect the effective edge by the detecting means. In addition, information for identifying an input signal in which the valid edge is detected is transmitted as the valid edge information to the central processing unit.

  According to a twelfth aspect of the present invention, in any one of the first to eleventh aspects, each of the plurality of input ports is an interrupt input port.

  The invention according to claim 13 is the invention according to any one of claims 1 to 12, wherein the central processing unit has an interrupt input port, and acquires information from the detection device from the interrupt input port. It is characterized by that.

  The invention of claim 14 is characterized in that, in the invention of any one of claims 1 to 13, the central processing unit and the detection device are connected by a parallel bus.

  A fifteenth aspect of the invention is characterized in that, in the invention of any one of the first to thirteenth aspects, the central processing unit and the detection device are connected by a serial bus.

  A sixteenth aspect of the invention is characterized in that, in the invention of any one of the first to fifteenth aspects, the central processing unit and the detection device communicate with each other by master / slave communication.

  According to the invention of claim 1, the input line for each input signal is connected to the plurality of input ports of the detection device, the detection means of the detection device detects the valid edge of the input signal, and the count means uses the valid edge. By performing the count process, a count process using a plurality of input signals can be realized.

  According to the second aspect of the present invention, the counter processing method for each input signal can be arbitrarily set by the user operating the setting means.

  According to the invention of claim 3, the input time constant can be arbitrarily set by the user operating the setting means. Thereby, the influence of the noise sporadically generated in the input signal can be reduced.

  According to the invention of claim 4, the user can arbitrarily set the initial value of each count value by operating the setting means.

  According to the invention of claim 5, the end value of each count value can be arbitrarily set by the user operating the setting means.

  According to the invention of claim 6, since the setting means is provided in the central processing unit, the user can easily set the setting contents via the central processing unit.

  According to the invention of claim 7, the user can easily set the setting contents via the switch.

  According to the invention of claim 8, the notification means notifies when the count value reaches the end value for each input signal, so that the user knows that the count value is the end value for each input signal. it can.

  According to the invention of claim 9, the user can easily know through the central processing unit that the count value is the end value for each input signal.

  According to the invention of claim 10, the user can easily know through the external device that the count value is the end value for each input signal.

  According to the eleventh aspect of the invention, the effective edge information is information for identifying the input signal from which the effective edge is detected, so that n bits of 1 bit are provided for each input signal as the effective edge information. Compared to information, the number of bits can be reduced.

  According to the twelfth aspect of the invention, since the detection device can preferentially acquire the input signal whose level has changed, the detection device can reliably detect the effective edge of the input signal whose level has changed. As a result, the counting process using a plurality of input signals can be performed more accurately.

  According to the invention of claim 13, even when the central processing unit is performing other processing, the central processing unit can preferentially perform the count processing by the interrupt input from the detection device. . As a result, the counting process using a plurality of input signals can be performed more accurately.

  According to the invention of claim 14, the information transmitted between the central processing unit and the detection device is transmitted one bit at a time by connecting the central processing unit and the detection device via a parallel bus. Can be sent in a short time.

  According to the fifteenth aspect of the present invention, when the central processing unit and the detection unit are connected by a serial bus, and the central processing unit wants to use a count value using n input signals, the serial bus is 3 Since the signal transmission between the central processing unit and the detection device can be realized only by connecting the signal lines to the central processing unit, the input signal input line to the central processing unit increases as the number of input signals increases. As compared with the case where the CPUs are directly connected, the number of signal lines connected to the central processing unit can be reduced, and as a result, the number of ports required for the central processing unit can be reduced.

  According to the invention of claim 16, the master side can transmit information to and from the slave side at a timing convenient for itself.

(Embodiment 1)
First, the configuration of the counter system according to the first embodiment will be described with reference to FIG. The counter system of this embodiment includes a central processing unit 1 that performs processing using count values, and a detection device 2 that detects edges of input signals S1 to Sn of a plurality of different binary signals.

The detection device 2 is input via a plurality of input ports 20 (20 _{1 to} 20 _n ) to which input lines L1 to Ln to which input signals S1 to Sn are transmitted are respectively connected, and a plurality of input ports 20. A detection unit (detection means) 21 that detects the valid edges of the input signals S1 to Sn for each of the input signals S1 to Sn, a sub-side input / output interface 22 used for information transmission with the central processing unit 1, and a central processing unit 1 is provided with a communication control unit (first communication control means) 23 that performs communication with the communication device 1.

Corresponding input signals S1 to Sn are input to each input port 20, respectively. Specifically, the input port 20 ₁ is the input signal S1 is input, the input port 20 ₂ is input signal S2 is input. In this way, the input signal Sn is input to the input port 20 _n .

Detector 21, an input signal S1~Sn inputted to each input port ₂₀ 1 to 20 _n from the input port 20 ₁ acquired sequentially, according to a preset counting method, the acquired input signal S1~Sn Detect valid edges. In the present embodiment, the count processing method for each of the input signals S1 to Sn will be described as a single-phase input method. For example, in the case of the input signal S1, as illustrated in FIG. 12A, the detection unit 21 detects a rising edge (change from OFF to ON) of the input signal S1 as an effective edge. In the case of other input signals S2 to Sn, the detection unit 21 detects a valid edge in the same manner as in the case of the input signal S1.

  The communication control unit 23 transmits the identification information (number information) of the input signals S <b> 1 to Sn in which the valid edge is detected by the detection unit 21 to the central control device 1.

  The central processing unit 1 performs arithmetic processing and device control by a program, and communicates between the main input / output interface 10 connected to the sub input / output interface 22 of the detection device 2 and the detection device 2. A communication control unit (second communication control unit) 11 for performing, and a count unit (counting unit) 12 for performing count processing according to the count processing method for each of the input signals S1 to Sn and updating the count value.

  When the detection unit 21 of the detection device 2 detects a valid edge, the count unit 12 acquires the identification information of the input signals S <b> 1 to Sn from which the valid edge is detected via the main-side input / output interface 10. In the present embodiment, since the counter processing method for each of the input signals S1 to Sn is a single-phase input method, for example, the case of the input signal S1 will be described. In the count unit 12, the detection unit 21 detects a valid edge. Each time the identification information of the input signal S1 is acquired, the count value is incremented by one as shown in FIG. In the case of other input signals S2 to Sn, the count unit 12 updates the count value in the same manner as in the case of the input signal S1.

By the way, in the counter system of this embodiment, the main side input / output interface 10 of the central processing unit 1 and the sub side input / output interface 22 of the detection device 2 are connected by a parallel bus 30. At this time, the identification information of each of the input signals S1 to Sn can be represented by (log ₂ n) bits, where n is the number of input signals S1 to Sn. For example, when there are two input signals S1 to Sn, it is 1 bit, when there are 3 or 4 input signals S1 to Sn, it is 2 bits, and when it is 129 or more and 256 or less, it is 8 bits. . Therefore, since the number of signal lines used for the parallel bus 30 is the same as the number of bits of signals transmitted and received by the parallel bus 30, assuming that the number of input signals S1 to Sn is n, (log ₂ n) Become.

  In addition, two signal lines 31 and 32 used for handshaking between the central processing unit 1 and the detection device 2 are connected to the main-side input / output interface 10 and the sub-side input / output interface 22. Yes. On the signal line 31, an A signal Sa, which is a signal indicating that handshaking is to be performed, is transmitted from the detection device 2 to the central processing unit 1. On the signal line 32, the B signal Sb is transmitted from the central processing unit 1 to the detection device 2.

  Hereinafter, an information transmission operation between the central processing unit 1 and the detection device 2 will be described with reference to FIG. Here, the input signal S1 will be described as a representative, but the same applies to the other input signals S2 to Sn.

  First, in the detection device 2, when the detection unit 21 detects a valid edge of the input signal S <b> 1, the communication control unit 23 causes the parallel bus 30 to transmit identification information of the input signal S <b> 1 in which the valid edge is detected. The transmission of the identification information is continued until the detection unit 21 detects valid edges of the input signals S1 to Sn. While the identification information is continuously transmitted, the communication control unit 23 turns the A signal Sa on from off and transmits the on A signal Sa to the central processing unit 1 via the signal line 31.

  When the communication control unit 11 of the central processing unit 1 receives the ON A signal Sa, the communication control unit 11 acquires the identification information of the input signal S1 in which the valid edge is detected from the parallel bus 30. After acquiring the identification information, the communication control unit 11 turns the B signal Sb from OFF to ON, and transmits the ON B signal Sb to the detection device 2 via the signal line 32.

  Thereafter, when receiving the ON B signal Sb, the communication control unit 23 of the detection device 2 turns the A signal Sa from ON to OFF, and transmits the OFF A signal Sa to the central processing unit 1 through the signal line 31.

  Thereafter, when receiving the OFF A signal Sa, the communication control unit 11 of the central control device 1 turns the B signal Sb from ON to OFF, and transmits the OFF B signal Sb to the detection device 2 via the signal line 32. Further, the count unit 12 updates the count value of the input signal S1 based on the identification information of the input signal S1 acquired by the communication control unit 11 via the parallel bus 30.

  Thereafter, the communication control unit 23 of the detection device 2 receives the OFF B signal Sb.

  As described above, master / slave communication is performed between the central processing unit 1 and the detection device 2. In the present embodiment, the detection device 2 is a master and the central processing unit 1 is a slave.

  As described above, according to the present embodiment, the input lines L1 to Ln for the input signals S1 to Sn are connected to the plurality of input ports 20 of the detection device 2, and the detection unit 21 of the detection device 2 validates the input signals S1 to Sn. When the edge is detected and the counting unit 12 of the central processing unit 1 performs the counting process using the effective edge, the counting process using the plurality of input signals S1 to Sn can be realized.

In addition, when the central processing unit 1 and the detection device 2 are connected by the parallel bus 30, the central processing unit 1 uses the count value using the n input signals S1 to Sn as the parallel bus 30. (Log ₂ n) signal lines and two signal lines 31 and 32 for handshaking can be prepared, and information transmission between the central processing unit 1 and the detection unit 2 can be realized. Therefore, as the number of the input signals S1 to Sn increases, the signal connected to the central processing unit 1 compared to the case where the input lines L1 to Ln of the plurality of input signals S1 to Sn are directly connected to the central processing unit 1. The number of lines can be reduced, and as a result, the number of ports required for the central processing unit 1 can be reduced.

  Furthermore, communication between the central processing unit 1 and the detection device 2 is performed by master / slave communication, so that the master side can transmit information to and from the slave side at a timing convenient for itself.

Further, according to the present embodiment, the valid edge information is information for identifying the input signals S1 to Sn in which the valid edge is detected, so that one bit is provided for each of the input signals S1 to Sn as the valid edge information. The number of bits can be reduced compared to the given n-bit information. In particular, effective edge information is (log ₂ n) -bit information, and this information is transmitted by the parallel bus 30, whereby (log ₂ n) signal lines as the parallel bus 30 and 2 for handshaking are used. By preparing only the signal lines 31 and 32 of the book, it is possible to transmit information on the effective edge from the detection device 2 to the central processing unit 1. Thereby, as the number of input signals S1 to Sn increases, the number of signal lines connected to the central processing unit 1 is reduced as compared to the case where input lines for a plurality of input signals are directly connected to the central processing unit. As a result, the number of ports required for communication with the detection device 2 in the central processing unit 1 can be reduced.

  As a modification of the first embodiment, the detection device 2 may include a count unit (counting unit) that performs count processing according to the count processing method for each of the input signals S1 to Sn. . Even in such a configuration, the input lines L1 to Ln for each of the input signals S1 to Sn are connected to the plurality of input ports 20 of the detection device 2, and the detection unit 21 of the detection device 2 enables the input signals S1 to Sn to be valid. Count processing using a plurality of input signals S1 to Sn as in the first embodiment by detecting an edge and performing a count process using the valid edges of the input signals S1 to Sn by the count unit of the detection device 2 Can be realized.

  As another modification of the first embodiment, the count processing method for each of the input signals S1 to S2 may be a two-phase input method, an individual input method, a direction determination input method, or the like. The same applies to the following embodiments. At this time, the number of signal lines used in the parallel bus 30 is appropriately set according to the amount of information transmitted from the detection device 2 to the central processing unit 1.

  In the case of the two-phase input method, as shown in FIG. 12 (b), when the A-phase input signal is S1 and the B-phase input signal is S2, the detection unit 21 inputs when the input signal S1 is OFF. The rising edge (change from OFF to ON) and the falling edge (change from ON to OFF) of the signal S2 are detected as effective edges. When the count unit 12 acquires information about the valid edge detected by the detection unit 21, the count unit 12 increases the count value by 1 at the falling edge and decreases the count value by 1 at the rising edge. In the case of the two-phase input method in which other input signals S2 to Sn are combined, the detection unit 21 detects the valid edge in the same manner as the input signals S1 and S2, and the count unit 12 receives the input signals S1 and S2. The count value is updated by the same method as in S2.

  In the case of the individual input method, as shown in FIG. 12C, when the A-phase input signal is S1 and the B-phase input signal is S2, the detection unit 21 detects the rising edge of the input signal S1 and the input signal S2. A rising edge is detected as a valid edge. When the count unit 12 acquires information about the valid edge detected by the detection unit 21 of the detection device 2, the count value is incremented by 1 when the valid edge is the rising edge of the input signal S1, and the valid edge is the input signal. When it is the rising edge of S2, the count value is decreased by one. Also in the case of the individual input method in which other input signals S2 to Sn are combined, the detection unit 21 detects a valid edge in the same manner as the input signals S1 and S2, and the count unit 12 receives the input signals S1 and S2. The count value is updated in the same manner as in.

  In the case of the direction discrimination input method, as shown in FIG. 12D, when the A-phase input signal is S1 and the B-phase input signal is S2, the detection unit 21 uses the rising edge of the input signal S1 as a valid edge. And the ON / OFF state of the input signal S2 at this time is detected. And the count part 12 will acquire a count value, if the information on the effective edge detected by the detection part 21 of the detection apparatus 2 is a rising edge of the input signal S1 at the time of the OFF state of the input signal S2. When the valid edge is the rising edge of the input signal S1 when the input signal S2 is on, the count value is decreased by one. Also in the case of the direction discrimination input method in which other input signals S2 to Sn are combined, the detection unit 21 detects a valid edge in the same manner as the input signals S1 and S2, and the count unit 12 receives the input signals S1 and S1. The count value is updated by the same method as in S2.

(Embodiment 2)
The counter system according to the second embodiment is implemented in that the main input / output interface 10 of the central processing unit 1 and the sub input / output interface 22 of the detection device 2 are connected by a serial bus 40 as shown in FIG. This is different from the counter system of the first embodiment (see FIG. 1). In addition, about the component similar to Embodiment 1, the same code | symbol is attached | subjected and description is abbreviate | omitted.

The number of bits of signals transmitted and received on the serial bus 40 is (log ₂ n) bits, where n is the number of input signals S1 to Sn. For example, when the number of input signals S1 to Sn is 2, it is 1 bit, when the number of input signals S1 to Sn is 3 or 4, it is 2 bits, and when it is 129 or more and 256 or less, it is 8 bits. On the other hand, the number of signal lines used for the serial bus 40 is three regardless of the number of bits of signals transmitted and received on the serial bus 40.

  Hereinafter, an information transmission operation between the central processing unit 1 and the detection device 2 will be described with reference to FIG. Here, the input signal S1 will be described as a representative, but the same applies to the other input signals S2 to Sn.

  First, in the detection device 2, when the detection unit 21 detects a valid edge of the input signal S1, the communication control unit 23 generates a detection command of the input signal S1 in which the valid edge is detected, and the generated detection command is transmitted to the serial bus. 40.

  The communication control unit 11 of the central processing unit 1 receives the detection command and acquires the identification information of the input signal S1 in which the valid edge is detected. After acquiring the identification information, the communication control unit 11 generates a response and transmits the generated response to the detection device 2.

  Thereafter, the communication control unit 23 of the detection device 2 receives the response.

  Thereafter, the count unit 12 of the central control device 1 updates the count value of the input signal S1 based on the identification information of the input signal S1 acquired by the communication control unit 11.

  As described above, according to the present embodiment, the central processing unit 1 and the detection device 2 are connected by the serial bus 40, so that the central processing unit 1 wants to use the count value using the n input signals S1 to Sn. In this case, the information transmission between the central processing unit 1 and the detection unit 2 can be realized only by connecting three signal lines as the serial bus 40 to the central processing unit 1. As the number increases, the number of signal lines connected to the central processing unit 1 can be reduced as compared with the case where the input lines L1 to Ln of the input signals S1 to Sn are directly connected to the central processing unit 1, As a result, the number of ports required for the central processing unit 1 can be reduced.

(Embodiment 3)
As shown in FIG. 5, in the counter system of the third embodiment, the central processing unit 1 has a setting unit (setting means) 13 for selecting the count processing method of each input signal S1 to Sn from a plurality of types of count processing methods. It differs from the counter system (refer FIG. 1) of Embodiment 1 by the point provided. In addition, about the component similar to Embodiment 1, the same code | symbol is attached | subjected and description is abbreviate | omitted.

  In the setting unit 13, the number of the input signal and the count processing method are set. For example, if the input signals S1 to Sn are numbered 1 to n in order, and the count processing method is 0 for the single-phase input method, 1 for the two-phase input method, 2 for the individual input method, and 3 for the direction discrimination method, If the count processing method of the signal S2 is to be a single-phase input method, the user may set the number of the input signals S1 to Sn and the number of the count processing method to 0 using the setting unit 13. When the two-phase input method, the individual input method, or the direction determination method is used, since the two adjacent input signals S1 to Sn are used, the smaller one of the two input signals S1 to Sn may be set. .

  The count unit 12 of the present embodiment performs count processing according to the count processing method set by the setting unit 13. Further, the communication control unit 11 according to the present embodiment transmits the count processing method set by the setting unit 13 to the detection device 2 via the parallel bus 33. The number of parallel buses 33 is N when the count processing method information is N bits.

  The communication control unit 23 according to the present embodiment receives the count processing method set by the setting unit 13 from the central processing device 1. Further, the detection unit 21 of the present embodiment detects the valid edges of the input signals S1 to Sn according to the count processing method received by the communication control unit 23.

  Next, the setting operation of the count processing method in the counter system of this embodiment will be described with reference to FIG. Here, the input signal S1 will be described as a representative, but the same applies to the other input signals S2 to Sn.

  First, in the central processing unit 1, when the count processing method of the input signal S1 is set by the setting unit 13, the communication control unit 11 sends the identification information of the input signal S1 corresponding to the set count processing method to the parallel bus 30. Send with. In addition, the communication control unit 11 transmits the count processing method of the input signal S1 through the parallel bus 33. Then, the communication control unit 11 turns the A signal Sa from OFF to ON, and transmits the ON A signal Sa to the detection device 2 through the signal line 31.

  The communication control unit 23 of the detection device 2 receives the identification information of the input signal S1 via the parallel bus 30 and receives the set count processing method via the parallel bus 33. The detection unit 21 acquires the count processing method of the input signal S1 received by the communication control unit 23, and thereafter disables interrupts. Thereafter, the detection unit 21 changes the count processing method of the input signal S1 so far to the count processing method of the acquired input signal S1. Thereafter, the detection unit 21 permits interruption, turns the B signal Sb from OFF to ON, and transmits the ON B signal Sb to the central processing unit 1 via the signal line 32.

  When receiving the ON B signal Sb, the communication control unit 11 of the central processing unit 1 switches the A signal Sa from ON to OFF and transmits the OFF A signal Sa to the detection device 2 via the signal line 31.

  After that, when receiving the OFF A signal Sa, the communication control unit 23 of the detection device 2 turns the B signal Sb from ON to OFF, and transmits the OFF B signal Sb to the central processing unit 1 via the signal line 32.

  Thereafter, the communication control unit 11 of the central controller 1 receives the OFF B signal Sb.

  As described above, according to the present embodiment, the user can arbitrarily set the count processing method of the input signals S1 to Sn by operating the setting unit 13. In the present embodiment, since the setting unit 13 is provided in the central processing unit 1, the user can easily set the count processing method of the input signals S <b> 1 to Sn via the central processing unit 1.

(Embodiment 4)
The counter system of the fourth embodiment is that the setting unit (setting means) 13 shown in FIG. 5 is not for setting the count processing method, but for setting an input time constant. It is different from the counter system. In addition, about the component similar to Embodiment 3, the same code | symbol is attached | subjected and description is abbreviate | omitted.

  The input time constant refers to the time from when the detection unit 21 detects the edges of the input signals S1 to Sn until the edge is taken in as a valid edge by continuing a certain level. That is, it is a constant that gives an indication of the detection timing for the edges of the input signals S1 to Sn in the detection unit 21. For example, when the input time constant is set to 5 milliseconds, when the level of the input signals S1 to Sn changes and the level after the change continues for 5 milliseconds, the detection unit 21 of the detection device 2 detects the input signals S1 to Sn. Edges are detected as valid edges. Thereby, the influence of the noise which occurs sporadically in the input signals S1 to Sn can be reduced.

  The communication control unit 11 according to the present embodiment transmits the input time constant set by the setting unit 13 to the detection device 2.

  The communication control unit 23 according to the present embodiment receives the input time constant set by the setting unit 13 from the central processing unit 1. Moreover, the detection part 21 of this embodiment detects the effective edge of the input signals S1-Sn after the input time constant received by the communication control part 23 passes.

  The setting operation of the input time constant in the counter system of the present embodiment is the same as that in the fifth embodiment when the count processing method is the input time constant as the setting contents of FIG.

  As described above, according to the present embodiment, the user can arbitrarily set the input time constant by operating the setting unit 13. In this embodiment, since the setting unit 13 is provided in the central processing unit 1, the user can easily set the input time constant via the central processing unit 1.

(Embodiment 5)
The counter system of the fifth embodiment is that the setting unit (setting means) 13 shown in FIG. 5 is for setting initial values of the count values of the input signals S1 to Sn. Is different. In addition, about the component similar to Embodiment 3, the same code | symbol is attached | subjected and description is abbreviate | omitted.

  The count unit 12 of this embodiment starts the count process from the initial value of the count value set by the setting unit 13.

  As described above, according to the present embodiment, the user can arbitrarily set the initial values of the count values of the input signals S1 to Sn by operating the setting unit 13. In the present embodiment, since the setting unit 13 is provided in the central processing unit 1, the user can easily set the initial value of the count value via the central processing unit 1.

(Embodiment 6)
The counter system of the sixth embodiment is different from the counter system of the third embodiment in that the setting unit (setting means) 13 shown in FIG. 5 is for setting a counter target value that is an end value of each count value. Is different. In addition, about the component similar to Embodiment 3, the same code | symbol is attached | subjected and description is abbreviate | omitted.

  The count unit 12 of the present embodiment performs a count process until the count value reaches the counter target value set by the setting unit 13.

  As described above, according to the present embodiment, the user can arbitrarily set the counter target value of each count value by operating the setting unit 13. In the present embodiment, since the setting unit 13 is provided in the central processing unit 1, the user can easily set the counter target value via the central processing unit 1.

  In the third to sixth embodiments, the case where the central processing unit 1 and the detection device 2 are connected by the parallel bus 30 has been described. However, as in the second embodiment, the central processing unit 1 and the detection device 2 are serial buses. Even when connected by 40 (refer FIG. 3), you may provide the setting part 13 of Embodiment 3-6. Even in such a configuration, the setting content can be set via the central processing unit 1 by the user operating the setting unit 13 as in the third to sixth embodiments.

(Embodiment 7)
As shown in FIG. 7, the counter system of the seventh embodiment includes the counter unit of the sixth embodiment (see FIG. 5) in that the detection device 2 includes a count unit 24 and the communication control unit 23 has a function as a notification unit. ) Is different. In addition, about the component similar to Embodiment 6, the same code | symbol is attached | subjected and description is abbreviate | omitted.

  The communication control unit 23 notifies the central processing unit 1 that the count value of each of the input signals S1 to Sn has reached the counter target value by the count unit 24.

  Next, the notification operation in the counter system of this embodiment will be described with reference to FIG. Here, the input signal S1 will be described as a representative, but the same applies to the other input signals S2 to Sn.

  First, in the detection device 2, the detection unit 21 detects a valid edge, and the count unit 24 updates the count values of the input signals S1 to Sn based on the valid edge. Here, when the count value reaches the counter target value, the communication control unit 23 transmits the identification information of the input signals S <b> 1 to Sn to the central processing unit 1 through the parallel bus 30. At this time, the communication control unit 23 turns the A signal Sa on from off, and transmits the on A signal Sa to the central processing unit 1 via the signal line 31.

  The communication control unit 11 of the central processing unit 1 receives the identification information of the input signals S1 to Sn whose count value has reached the counter target value. Thereafter, the communication control unit 11 turns the B signal Sb from OFF to ON, and transmits the ON B signal Sb to the detection device 2 via the signal line 32.

  When receiving the ON B signal Sb, the communication control unit 23 of the detection device 2 turns the A signal Sa from ON to OFF, and transmits the OFF A signal Sa to the central processing unit 1 via the signal line 31.

  When the communication control unit 11 of the central processing unit 1 receives the OFF A signal Sa, the communication control unit 11 switches the B signal Sb from ON to OFF, and transmits the OFF B signal Sb to the detection device 2 via the signal line 32.

  Thereafter, the communication control unit 23 of the detection device 2 receives the OFF B signal Sb.

  As described above, according to the present embodiment, when the communication control unit 23 notifies that the count value has reached the counter target value for each of the input signals S1 to Sn, the user can obtain the count value for each of the input signals S1 to Sn. It is possible to know that the counter target value has been reached. In particular, in the present embodiment, the user can easily know through the central processing unit 1 that the count value has reached the counter target value for each of the input signals S1 to Sn.

  In the seventh embodiment, the case where the central processing unit 1 and the detection device 2 are connected via the parallel bus 30 has been described. However, as in the second embodiment, the central processing unit 1 and the detection device 2 are connected to the serial bus 40 ( Even in the case of connection in FIG. 3, the communication control unit 23 notifies the user that the count value has reached the counter target value for each of the input signals S1 to Sn, as in the third to sixth embodiments. However, it can be known that the count value has reached the counter target value for each of the input signals S1 to Sn. In particular, in the present embodiment, the user can easily know through the central processing unit 1 that the count value has reached the counter target value for each of the input signals S1 to Sn.

(Embodiment 8)
As shown in FIG. 8, the counter system of the eighth embodiment is different from the counter system of the seventh embodiment (see FIG. 7) in that it includes an external device 5 connected to the detection device 2. In addition, about the component similar to Embodiment 7, the same code | symbol is attached | subjected and description is abbreviate | omitted.

  The external device 5 includes an input / output interface 50 used for information transmission with the detection device 2, a communication control unit 51 that performs communication with the detection device 2, and input signals S1 to S1 that have reached a counter target value. And an informing unit 52 for informing Sn.

  The communication control unit 23 of the present embodiment controls information transmission with the central processing unit 1 and also controls information transmission with the external device 5. The communication control unit 23 notifies the external device 5 that the count unit 24 has reached the counter target value for each of the input signals S1 to Sn.

  Next, the notification operation in the counter system of this embodiment will be described. Here, the input signal S1 will be described as a representative, but the same applies to the other input signals S2 to Sn.

  First, in the detection device 2, the detection unit 21 detects a valid edge, and the count unit 24 updates the count values of the input signals S1 to Sn based on the valid edge. Here, when the count value reaches the counter target value, the communication control unit 23 transmits the identification information of the input signals S <b> 1 to Sn to the external device 5 through the parallel bus 30. At this time, the communication control unit 23 turns the A signal Sa from OFF to ON, and transmits the ON A signal Sa to the external device 5 through the signal line 31.

  The communication control unit 51 of the external device 5 receives the identification information of the input signals S1 to Sn whose count value has reached the counter target value. Thereafter, the communication control unit 51 turns the B signal Sb from OFF to ON, and transmits the ON B signal Sb to the detection device 2 via the signal line 32.

  When the communication control unit 23 of the detection device 2 receives the ON B signal Sb, the communication control unit 23 turns the A signal Sa from ON to OFF, and transmits the OFF A signal Sa to the external device 5 through the signal line 31.

  When receiving the off A signal Sa, the communication control unit 51 of the external device 5 turns the B signal Sb from on to off, and transmits the off B signal Sb to the detection device 2 via the signal line 32.

  Thereafter, the communication control unit 23 of the detection device 2 receives the OFF B signal Sb.

  As described above, according to the present embodiment, the user can know through the external device 5 that the count value has reached the counter target value for each of the input signals S1 to Sn.

  In the eighth embodiment, the case where the external device 5 and the detection device 2 are connected via the parallel bus 30 has been described. However, as shown in FIG. 9, the external device 5 and the detection device 2 are connected to the serial bus 40 (see FIG. 9). 3), the user can easily know through the external device 5 that the count value has reached the counter target value for each of the input signals S1 to Sn, as in the eighth embodiment. .

(Embodiment 9)
As shown in FIG. 9, the counter system of the ninth embodiment includes a switch 6 connected to the detection device 2 via a parallel bus 30, and the detection device 2 includes a count unit 24. (See FIG. 1). In addition, about the component similar to Embodiment 1, the same code | symbol is attached | subjected and description is abbreviate | omitted.

  The switch 6 is a dip switch, and a setting unit (setting means) 60 for setting the count processing method of each of the input signals S1 to Sn, an input / output interface 61 used for information transmission with the detection device 2, and detection And a communication control unit 62 that performs communication with the apparatus 2.

  The communication control unit 23 according to the present embodiment is a receiving unit that receives the count processing method set by the setting unit 60 from the switch 6. Further, the detection unit 21 of the present embodiment detects the valid edges of the input signals S1 to Sn according to the count processing method received by the communication control unit 23. Furthermore, the count unit 24 of the present embodiment performs count processing according to the count processing method received by the communication control unit 23.

  As described above, according to the present embodiment, the user can easily set the count processing method of the input signals S1 to Sn via the switch 6.

  As a modification of the ninth embodiment, the setting content of the switch 6 is changed to the count processing method of the input signals S1 to Sn, the input time constant, the initial value of the count values of the input signals S1 to Sn, or the count values. Any of the counter target values may be used. Even in such a case, the user can easily set the setting content via the switch 6.

  In the ninth embodiment, the case where the switch 6 and the detection device 2 are connected by the parallel bus 30 has been described. However, as shown in FIG. 10, the switch 6 and the detection device 2 are connected by the serial bus 40. Even in this case, as in the ninth embodiment, the user can easily set the setting content via the switch 6.

(Embodiment 10)
As shown in FIG. 1, the counter system of the tenth embodiment is different from the counter system of the first embodiment in that each of the plurality of input ports 20 is an interrupt input port. In addition, about the component similar to Embodiment 1, the same code | symbol is attached | subjected and description is abbreviate | omitted.

  As described above, according to the present embodiment, since the detection device 2 can preferentially acquire the input signals S1 to Sn in which the edge is generated, the edge can be detected without delay, and as a result, a plurality of inputs can be detected. Count processing using the signals S1 to Sn can be performed more accurately.

(Embodiment 11)
The counter system of the eleventh embodiment is different from the counter system of the first embodiment in that an interrupt input port is included in the main input / output interface 10 as shown in FIG. That is, the central processing unit 1 acquires information from the detection device 2 from the interrupt input port. In addition, about the component similar to Embodiment 1, the same code | symbol is attached | subjected and description is abbreviate | omitted.

  As described above, according to the present embodiment, even when the central processing unit 1 performs other processing, the central processing unit 1 preferentially performs the counting process by the interrupt input from the detection device 2. be able to. As a result, the counting process using the plurality of input signals S1 to Sn can be performed more accurately.

  In addition, it can apply also in Embodiment 2-9 as a modification of Embodiment 10,11. Further, the input port 20 that is an interrupt input port as in the tenth embodiment and the main-side input / output interface 10 including the interrupt input port as in the eleventh embodiment may be used in combination.

It is a block diagram which shows the structure of the counter system which concerns on Embodiment 1,10,11. It is a figure which shows operation | movement of the counter system which concerns on Embodiment 1. FIG. It is a block diagram which shows the structure of the counter system which concerns on Embodiment 2. It is a figure which shows operation | movement of the counter system which concerns on the same as the above. It is a block diagram which shows the structure of the counter system which concerns on Embodiment 3-6. It is a figure which shows operation | movement of the counter system which concerns on the same as the above. It is a block diagram which shows the structure of the counter system which concerns on Embodiment 7. FIG. It is a block diagram which shows the structure of the counter system which concerns on Embodiment 8. FIG. It is a block diagram which shows the structure of the counter system which concerns on Embodiment 9. FIG. It is a block diagram which shows the structure of the counter system which concerns on a modification same as the above. It is a block diagram which shows the structure of the conventional counter system. It is a figure which shows a count processing system.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Central processing unit 10 Main side input / output interface 11 Communication control part 12 Count part 2 Detection apparatus 20 Input port 21 Detection part 22 Sub side input / output interface 23 Communication control part S1-Sn Input signal

Claims (16)

A central processing unit that performs processing using the count value obtained by counting the input signal of the binary signal according to the count processing method;
A plurality of input ports to which input lines to which input signals of different binary signals are transmitted are connected to each other, and detection for detecting an effective edge of the input signal for each input signal input through the plurality of input ports And a detection device having first communication control means for communicating with the central processing unit,
The central processing unit has a second communication control means for communicating with the detection device,
Either the central processing unit or the detection device acquires information on the valid edge according to a preset count processing method for each input signal, and performs count processing according to the preset count processing method. The counter system is provided with a counting means for updating the count value by performing. A setting means for selecting one count processing method from a plurality of types of count processing methods,
The counter system according to claim 1, wherein the counting unit performs a counting process according to a counter processing method set by the setting unit.   It further comprises setting means for setting an input time constant that is a time from when the detecting means detects an edge of the input signal until a certain level is continued and the edge is taken as the effective edge. The counter system according to claim 1. Comprising setting means for setting a start value of the count value;
The counter system according to claim 1, wherein the counting unit starts the counting process from a start value of the count value set by the setting unit. Setting means for setting an end value of the count value;
The counter system according to claim 1, wherein the counting unit performs the counting process until the count value set by the setting unit reaches the end value.   The counter system according to claim 2, wherein the setting unit is provided in the central processing unit. A switch having the setting means and connected to the detection device;
The counter system according to any one of claims 2 to 5, wherein the detection device receives the setting content set by the setting unit from the switch.   6. The counter system according to claim 5, further comprising notification means for notifying other devices when the count value reaches the end value by the counting means. The detection device includes the counting unit and the notification unit,
The counter system according to claim 8, wherein the notification unit notifies the central processing unit. An external device connected to the detection device;
The detection device includes the counting unit and the notification unit,
The counter system according to claim 8, wherein the notification unit notifies the external device. The counting means is provided in the central processing unit,
When the detection means detects the valid edge, the detection device transmits bit information identifying the input signal from which the valid edge is detected to the central processing unit as the valid edge information. The counter system according to any one of claims 1 to 8, characterized in that:   The counter system according to any one of claims 1 to 11, wherein each of the plurality of input ports is an interrupt input port.   The counter system according to any one of claims 1 to 12, wherein the central processing unit has an interrupt input port, and acquires information from the detection device from the interrupt input port.   The counter system according to claim 1, wherein the central processing unit and the detection device are connected by a parallel bus.   The counter system according to any one of claims 1 to 13, wherein the central processing unit and the detection device are connected by a serial bus.   16. The counter system according to claim 1, wherein the central processing unit and the detection device communicate with each other by master / slave communication.

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