JP5294138B2 - Pulse output device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pulse output device for detecting that a proper number of pulse signals are not output. <P>SOLUTION: A CPU 3 constitutes a pulse number calculating means 31 for calculating the number of pulses corresponding to an input signal, a pulse output means 32 for outputting a pulse signal of pulses as many as the number of pulses calculated by the pulse number calculating means 31, and a collation means 33 of collating the number of pulses counted by a pulse counter 61 with the number of pulses calculated by the pulse number calculating means 31. An external circuit 6 is provided with the pulse counter 61 which counts the pulses of the pulse signal output from the pulse output means 32, a register 62 which stores the count number counted by the pulse counter 61, and a communication means 63 of transmitting the count number stored in the register 62 to the CPU 3 through serial communication. <P>COPYRIGHT: (C)2009,JPO&amp;INPIT

Description

  The present invention relates to a pulse output device that outputs a pulse signal having the number of pulses corresponding to an input signal.

  As a device built in a field device, a pulse output device that outputs a pulse signal having a pulse number corresponding to an input signal is known. The pulse output device outputs an analog signal from a measurement target, an A / D converter that converts the signal amplified by the input circuit into a calculation value (digital data), and outputs the calculation value at a predetermined time. The CPU includes a CPU that calculates the number of pulses to be output and outputs a pulse signal (rectangular signal) of the number of pulses from the output port, and a transistor whose on / off is controlled by the pulse signal.

  With such a configuration, a signal from the measurement target is converted into a calculated value, and the number of pulses to be output in a predetermined time according to the calculated value is calculated. Furthermore, HIGH / LOW output is repeated at the output port of the CPU a number of times corresponding to the calculated number of pulses to generate a rectangular wave. The on / off of the transistor is controlled by this rectangular wave, and a pulse signal having the calculated number of pulses is output to the outside.

The above-described series of operations for outputting a pulse signal having a specific number of pulses corresponding to a signal from the measurement object is repeated every predetermined calculation cycle.
JP 2002-214007 A

  In the above pulse output device, for example, when there is an abnormality in the CPU port output or the like, there is a possibility that a pulse signal is not output or a pulse signal with an incorrect number of pulses is output. However, the conventional pulse output device has a problem that an abnormality cannot be detected even when a pulse signal having an appropriate number of pulses is not output.

  An object of the present invention is to provide a pulse output device capable of detecting a state in which a pulse signal having an appropriate number of pulses is not output.

The pulse output device of the present invention comprises pulse number calculating means for calculating the number of pulses according to an input signal, and pulse output means for outputting a pulse signal having the number of pulses calculated by the pulse number calculating means, In the pulse output device that outputs the pulse signal having the number of pulses corresponding to the input signal, the number of pulses calculated by the pulse number calculating unit according to the one input signal is set to the pulse corresponding to the one input signal. A storage unit that stores the output of the pulse signal from the output unit until the end of output, a count unit that counts the number of pulses of the pulse signal output from the pulse output unit in response to the one input signal, and the count unit The number of pulses counted and the number of pulses stored by the storage unit are set as a pulse from the pulse output unit corresponding to the one input signal. Includes a collating unit for collating after the end of the output signals, the number of pulses calculated by the pulse number calculating unit takes a plurality of values corresponding to said input signal, said storage means, an output from the pulse output unit The pulse number is obtained from the pulse number calculating means without using the pulse signal and stored, and the abnormality of the pulse output means is detected from the collation result in the collating means.
According to this pulse output device, since the number of pulses counted by the counting unit and the number of pulses calculated by the pulse number calculating unit are collated, it is possible to detect a state in which a pulse signal having an appropriate number of pulses is not output.

  As a result of the collation by the collating unit, an abnormality notifying unit for notifying an abnormality may be provided when the number of pulses counted by the counting unit and the number of pulses calculated by the pulse number calculating unit do not match.

  The abnormality notification unit may notify the number of pulses calculated by the pulse number calculation unit.

  The pulse number calculation means, the pulse output means, and the collation means are configured by a single CPU, and the counting means is provided outside the CPU, and the pulse output device displays the count result of the number of pulses in the counting means. You may provide the communication means which transmits toward the said collation means.

  The operation timing of the counting unit and the communication unit may be controlled based on a control signal from the CPU.

  According to the pulse output device of the present invention, since the number of pulses counted by the counting unit and the number of pulses calculated by the pulse number calculating unit are collated, it is possible to detect a state in which a pulse signal having an appropriate number of pulses is not output. .

  Hereinafter, an embodiment of a pulse output device according to the present invention will be described with reference to FIGS.

  FIG. 1A is a block diagram showing the configuration of the pulse output device of this embodiment.

  As shown in FIG. 1A, the pulse output device of the present embodiment converts an analog signal from a measurement target into an arithmetic circuit (digital data) and an input circuit 1 that amplifies an analog signal. CPU 3 that calculates the number of pulses to be output in a predetermined time from the A / D converter 2 that performs the above calculation, and outputs a pulse signal (rectangular signal) of the number of pulses from the output port; And a transistor 5 whose turn-off is controlled.

  With such a configuration, a signal from the measurement target is converted into a calculated value, and the number of pulses to be output in a predetermined time according to the calculated value is calculated. Further, HIGH / LOW output is repeated at the output port of the CPU 3 a number of times corresponding to the calculated number of pulses to generate a rectangular wave. The on / off of the transistor 5 is controlled by this rectangular wave, and a pulse signal having the calculated number of pulses is output to the outside.

  The above-described series of operations for outputting a pulse signal having a specific number of pulses corresponding to a signal from the measurement object is repeated every predetermined calculation cycle.

  As shown in FIG. 1A, the pulse output device of this embodiment includes an external circuit 6 for enabling detection of a state in which a pulse signal having an appropriate number of pulses is not output.

  FIG. 1B is a block diagram illustrating functions of the CPU 3 and the external circuit 6.

  As shown in FIG. 1B, the CPU 3 includes a pulse number calculating unit 31 that calculates the number of pulses according to the input signal, and a pulse output unit that outputs a pulse signal having the number of pulses calculated by the pulse number calculating unit 31. The collating unit 33 is configured to collate 32 with the number of pulses counted by a pulse counter 61 described later and the number of pulses calculated by the pulse number calculating unit 31.

  The external circuit 6 stores the pulse counter 61 for counting the number of pulses of the pulse signal output from the pulse output means 32, the register 62 for storing the count number counted by the pulse counter 61, and the register 62. And a communication means 63 for transmitting the counted number to the CPU 3 by serial communication. The pulse counter 61 functions as a counting means.

  Next, the operation of the pulse output device of this embodiment will be described.

  FIG. 2A is a timing chart showing the operation timing.

  As shown in FIG. 1B and FIG. 2A, the CPU 3 outputs a control signal corresponding to the calculation cycle and supplies it to the pulse counter 61. The pulse counter 61 counts up the pulse signal output from the pulse output means 32 during the period when the control signal is rising. As shown in FIG. 2A, when one calculation cycle is completed, the final count of the pulse counter 61 is stored in the register 62 with the falling edge of the control signal as a trigger. Then, the stored count number is transmitted to the CPU 3 by the communication means 63.

  For example, in FIG. 2A, the count number is switched in the order of 5 → 3 → 2 for each calculation cycle, and the value is stored in the register 62 with a delay of one cycle.

  On the other hand, as shown in FIG. 1B, the number of pulses calculated by the pulse number calculation means 31 is sequentially stored in the internal RAM 35 of the CPU 3.

  FIG. 2B is a flowchart showing an operation procedure in the CPU 3.

  In step S1 of FIG. 2B, the above-mentioned count number obtained from the register 62 via the communication means 63 and the corresponding calculation cycle calculated by the pulse number calculation means 31 and stored in the RAM 35 in the matching means 33 are stored. Check the number of pulses.

  In step S2, it is determined whether or not the two match as a result of collation. If the determination is affirmative, the process returns to step S1, and if the determination is negative, the process proceeds to step S3.

  In step S3, abnormality notification is performed by the abnormality notification means 34 (FIG. 1B), and the process returns to step S1.

  In step S3, a warning or alarm is generated to notify the outside of the abnormal state via a display device, an alarm device or communication. This makes it possible to take appropriate measures when an abnormality occurs.

  Further, information based on the number of pulses to be collated by the collating unit 33, that is, information based on the number of pulses calculated by the pulse number calculating unit 31 may be notified. For example, the pulse number itself calculated by the pulse number calculation unit 31 may be notified, or the difference between the count number and the pulse number may be notified. In this way, by notifying the information based on the number of pulses calculated by the number-of-pulses calculation unit 31, it is possible to perform appropriate processing in a device that receives a pulse signal from the pulse output device. For example, the cumulative value of the number of pulses can be corrected.

  In the above embodiment, the external circuit 6 is provided with a counting means (pulse counter 61). Usually, a device that receives a pulse signal from a pulse output device is provided with a function of counting the number of pulses of the pulse signal. Therefore, the function can also be used as a counting means. In this case, not only the operation of the pulse output device but also the pulse counting function in the connected device can be checked simultaneously.

  As described above, according to the pulse output device of the present invention, the number of pulses counted by the counting unit and the number of pulses calculated by the pulse number calculating unit are collated. Can detect the state that is not output.

  The scope of application of the present invention is not limited to the above embodiment. The present invention can be widely applied to a pulse output device that outputs a pulse signal having the number of pulses corresponding to an input signal.

It is a figure which shows the structure of the pulse output device of one Embodiment, etc., (a) is a block diagram which shows the structure of a pulse output device, (b) is a block diagram which shows the function of CPU and an external circuit. It is a figure which shows operation | movement of a pulse output device, (a) is a timing chart which shows operation | movement timing, b) is a flowchart which shows the operation | movement procedure in CPU.

Explanation of symbols

3 CPU
31 Pulse number calculation means 32 Pulse output means 33 Verification means 61 Pulse counter (counting means)
63 Communication means

Claims (5)

A pulse number calculating means for calculating the number of pulses according to the input signal;
Pulse output means for outputting a pulse signal of the number of pulses calculated by the pulse number calculation means,
In the pulse output device that outputs the pulse signal having the number of pulses corresponding to the input signal,
Storing means for storing the number of pulses calculated by the number-of-pulses calculating means according to the one input signal until the end of the output of the pulse signal from the pulse output means according to the one input signal;
Counting means for counting the number of pulses of the pulse signal output from the pulse output means according to the one input signal;
Collating means for collating the number of pulses counted by the counting means and the number of pulses saved by the saving means after the end of the output of the pulse signal from the pulse output means according to the one input signal;
With
The pulse number calculated by the pulse number calculation means takes a plurality of values according to the input signal,
The storage means acquires and stores the pulse number from the pulse number calculation means without using the pulse signal output from the pulse output means,
An abnormality of the pulse output means is detected from a collation result in the collation means. As a result of the collation by the collating means, it comprises an abnormality notifying means for notifying an abnormality when the number of pulses counted by the counting means and the number of pulses calculated by the pulse number calculating means do not match. The pulse output device according to claim 1. The pulse output device according to claim 2, wherein the abnormality notifying unit notifies information based on the number of pulses calculated by the pulse number calculating unit. The pulse number calculating means, the pulse output means and the collating means are constituted by one CPU, and the counting means is provided outside the CPU,
The pulse output device according to any one of claims 1 to 3, wherein the pulse output device includes a communication unit that transmits a count result of the number of pulses in the count unit to the collating unit. The pulse output device according to claim 4, wherein operation timings of the counting means and the communication means are controlled based on a control signal from the CPU.

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