JP4441873B2 - Input module - Google Patents

Description

  The present invention holds an input signal as a raw input value and executes a diagnosis. In the case of a normal diagnosis, the raw input value is fetched and held as a DI value, which is used as a PV value. The present invention relates to an input module for holding a captured and held DI value.

  Prior art documents related to an input module having a diagnostic function include the following.

JP 2004-199216 A

  FIG. 4 is a functional block diagram showing a basic configuration of a conventional input module disclosed in Patent Document 1. In FIG. In the input module 1, 11 is a control device, 12 is input means, 13 is diagnostic means, and 14 is PV value holding means.

  A digital input signal S given from the outside is received by the input means 12, and the input signal S1 is read out and inputted to the control device 11 and the diagnostic device 13. The diagnosis device 13 analyzes the state of the input signal S1 and diagnoses an external wiring abnormality (short circuit, disconnection, channel short-circuit) of the input module, a module internal abnormality (ON adhesion, OFF adhesion, channel short-circuit), etc. The value D is passed to the control device 11.

  The control device 11 once holds the input signal S1 as a raw input value, and when the diagnosis value D is normal diagnosis, captures and holds the raw input value as a DI value, and passes this as a PV value to the PV value holding means 14. In the case of abnormality diagnosis, the DI value fetched and held last time is held.

  FIG. 5 is a functional block diagram showing the internal configuration of the control device 11 in FIG. A raw input value holding unit 15 temporarily holds the input signal S1 as a raw input value IN. Reference numeral 16 denotes a previous value hold switch, which is switched by the diagnosis value D.

  In the case of normal diagnosis, the previous value hold switch 16 gives the raw input value IN to the DI value holding means 18 via the filter processing means 17 to fetch and hold it as a DI value. When the diagnostic value D is an abnormality diagnosis , The DI value fetched and held last time is given to the filter processing means 17 to hold this value.

  The DI value held in the DI value holding unit 18 is passed to the PV value holding unit 18 as a PV value. Since the function of the filter processing means 17 is disclosed in detail in Patent Document 1, the description thereof is omitted here.

  Since the conventional input module reads the input signal in one system, there are cases where the correct input value cannot be read due to a failure in the input means, a failure in the diagnostic means, or a failure in the module. In other words, there has been a problem that a phenomenon in which the input cannot be notified or a notification that the input has not been changed and that the input has been erroneously changed has occurred.

  Therefore, the problem to be solved by the present invention is to realize an input module that improves the wiring abnormality and failure detection rate, lowers the false detection rate of input fluctuation, and improves the input reliability.

In order to achieve such an object, the configuration of the present invention is as follows.
(1) In an input module that takes a digital input signal and holds it as a PV value,
While holding the input signal as a raw input value, and having a first control device and a second control device connected to each other by an inter-device communication function,
The first control device and the second control device are:
First and second DI value holding means for holding the raw input values captured respectively as DI values;
When the held DI value is used as the input value equalized PV value, the input value equalized PV value of the self is compared with the input value equalized PV value received from the other party, and the two values match. Includes first and second comparison processing means for holding this as a device-equalized PV value;
First, a device-equalized PV value held in the first and second comparison processing means is received, and the own device-equalized PV value is compared with the device-equalized PV value received from the counterpart. First and second recomparison processing means;
With
If the comparison result of at least one of the first and second re-comparison processing means is coincident, the inter-device equalization PV value held in one or both of the first control device and the second control device is obtained. An input module that holds the PV value .

(2) said first and second comparison means and the first and second re-comparison processing means, mismatch comparison result and outputs an error signal when successive predetermined periods (1) The input module described.

( 3 ) The second control device
The input module according to ( 1) or (2) , wherein if the comparison result of the second recomparison processing means does not match, a reset signal is output to the first control device.

( 4 ) The second control device includes:
Any one of (1) to (3) , wherein if the comparison result of the second recomparison processing means does not match, a signal for preventing the PV value from being held is output to the first control device. Input module according to.

( 5 ) The first control device and the second control device are:
Comprising a self-propelled timer means for regulating the timing of the signal processing respectively, and wherein from said first control device that starts a timer of the second control unit by the timing trigger notification to the second controller ( The input module according to any one of 1) to ( 4 ).

(6) the run diagnostics on the input signal, upon successful diagnostic to execute the incorporation of raw input values in the first controller and the second controller, the previous uptake value when the abnormality diagnosis The input module according to any one of (1) to ( 5 ), further comprising diagnostic means for holding the signal.

As is apparent from the above description, the present invention has the following effects.
(1) The diagnostic coverage is improved by reading input values into two systems.

(2) It is possible to detect all input misjudgments due to individual failure of the control device by comparing two input values.

(3) Filter processing as usual and PV value hold processing at the time of abnormality are possible.

(4) By the first two-system input value comparison (error 1) and hold processing, it is possible to hold the PV value during the transient two-system comparison abnormality due to input fluctuations. It is possible to detect a non-transient failure of the second input means.

(5) The failure of the first control device or the second control device can be detected by the second two-system input value comparison (error 2) and hold processing.

(6) By the timing trigger transmission and the timing control process of the input operation and the diagnostic operation, it is possible to prevent the input operation from being erroneously performed during the diagnosis.
From the above, it is possible to construct a highly reliable and highly functional system.

  Hereinafter, the present invention will be described in detail with reference to the drawings. FIG. 1 is a functional block diagram showing a basic configuration of an input module to which the present invention is applied. Reference numeral 100 denotes an input module to which the present invention is applied, which is characterized by a configuration in which input is performed in two systems and diagnosis is performed in one system.

  In the input module 100, reference numeral 200 denotes a first control device, 300 denotes a second control device, 400 denotes first input means, 500 denotes second input means, 600 denotes diagnostic means, and 700 denotes a PV value holding means. The diagnosis unit 600 and the PV value holding unit 700 have the same functions as the diagnosis unit 13 and the PV value holding unit 14 in the conventional input module described with reference to FIGS.

  A digital input signal S given from the outside is received in common by the first input means 400 and the second input means 500, and the input signals S1 and S2 are read out from the first input means 400 and second control means 200, respectively. 300 is input.

  Further, the input signal S2 is input to the diagnostic device 600. The diagnostic device 600 analyzes the state of the input signal S 2, diagnoses an external wiring abnormality of the input module or a module internal abnormality, and passes the diagnostic value D to the second control device 300.

  The first control device 200 and the second control device 300 each have means for holding the input signals S1 and S2 as raw input values, and if the diagnostic value D is a normal diagnosis, fetch and hold the raw input values as DI values, In the case of abnormality diagnosis, it has the same function as the conventional control device described with reference to FIG.

  The first control device 200 and the second control device 300 have an inter-device communication function, and the diagnostic value D passed to the second control device 300 is the first control device 200 side by this inter-device communication function. Forwarded to Further, the second control device 300 has a function of resetting the first control device 200, and the PV value holding means 700 holds the PV value notified from the first control device 200.

  FIG. 2 is a functional block diagram showing the internal configuration of the first control device 200 and the second control device 300. In the first control device 200, the configuration from the first raw input value holding means 201, the first previous value hold switch 202 switched by the diagnostic value D, the first filter processing means 203, and the first DI value holding means 204 is as follows. It has the same function as the elements 15 to 18 described in FIG.

  Similarly, in the second control device 300, the second raw input value holding means 301, the second previous value hold switch 302 switched by the diagnostic value D, the second filter processing means 303, and the second DI value holding means 304 are displayed. The configuration also has the same function as the elements 15 to 18 described in FIG.

  The raw input value IN1 of the first raw input value holding unit 201 is held as a DI1 value in the first DI value holding unit 204 via the first previous value hold switch 202 and the first filter processing unit 203. Similarly, the raw input value IN2 of the second raw input value holding unit 301 is held as a DI2 value in the second DI value holding unit 304 via the second previous value hold switch 302 and the second filter processing unit 303.

  At this time, the DI1 value and the DI2 value should be the same in most cases, but the input change instant (when the input fluctuates) may take different values to obtain input by a completely different system. .

  These held DI1 value and DI2 value are passed to the first comparison means 205 and the second comparison means 305 as input value equalized PV values PV1 and PV2. The first comparison unit 205 and the second comparison unit 305 transfer the acquired PV1 and PV2 to the comparison unit on the other side by the inter-device communication function.

  The first comparison means 205 compares the acquired PV1 on the own side and PV2 transferred from the other side, and if they match, holds this as the device-equalized PV value PV [1]. 1 is passed to the re-comparison means 207. If they do not match, the previous PV [1] is held. By this processing, PV1 and PV2 should match, and there is no mismatch at the time of input change due to two-line reading. At this time, if the time of mismatching continues, an input value comparison abnormality between controllers (error 1) occurs via the filter processing means 206.

  The second comparison means 305 compares the acquired PV2 on the own side and PV1 transferred from the other side, and if they match, holds this as the device-equalized PV value PV [2]. 2 Pass to re-comparison means 307. If they do not match, the previous PV [2] is held. By this processing, PV2 and PV1 should match, and there is no mismatch at the time of input change due to two-line reading. At this time, if the time of mismatching continues, an input value comparison abnormality between controllers (error 1) occurs via the filter processing means 306.

  Next, the first re-comparison means 207 and the second re-comparison means 307 convert the acquired PV [1] and PV [2] on their own side into the second re-comparison means 307 and the second re-comparison means 307 on the other side by the inter-device communication function. 1 Transfer to re-comparison means 207.

  The first re-comparing means 207 compares the acquired PV [1] on its own side with the PV [2] transferred from the other side, and if they match, it sets this as the correct PV value and turns on the switch means 209 Is notified to the PV value holding means 700. If they do not match, the PV value is not notified, that is, the previous PV value is held. If the discrepancy continues for a predetermined period, an inter-controller data comparison error (error 2) is generated via the filter processing means 208.

The second re- comparing means 307 compares the acquired PV [2] on its own side with the PV [1] transferred from the other side, and maintains the state if they match, and if they do not match, It is determined that the input value is not reliable, and a reset signal is transmitted to reset the first control device 200.

  When PV [1] and PV [2] in the second control device 300 are different, it is considered that either the first control device 200 or the second control device 300 is operating abnormally. It is possible to prevent notification of an incorrect PV value by resetting. If the discrepancy continues for a predetermined period, an inter-controller data comparison error (error 2) is generated via the filter processing means 308.

  The diagnosis unit 600 can diagnose a part of the second input unit 500 and a part inside the module, but cannot detect 100 %% abnormality as in the conventional input module. However, even if there is an abnormality that cannot be detected by the diagnostic means, the input is read in the two systems as described above, individually filtered, etc., and compared with each other PV1 and PV2, PV [1] and PV [2] By doing so, it becomes possible to detect as error 1 or error 2 at a considerably high rate.

  Also in the input module of the present invention, the conventional input filtering process disclosed in Patent Document 1 can be executed. However, depending on the input fluctuation timing, since two systems are used for input, a phenomenon may occur in which PV1 and PV2 do not match for the input filter time. Therefore, it is necessary that the filter time of error 1> the filter time of input. On the other hand, the filter time for error 2 does not need to be changed according to the input filter time.

  If the diagnosis timing on the second control device 200 side and the input operation by the first and second control devices 200 and 300 overlap, the diagnosis operation may affect the input of the first control device 200. For this reason, it is effective to shift the timing of signal processing by communication between control devices.

  FIG. 3 is a time chart for explaining the operation of the self-propelled timer included in the first control device 200 and the second control device 300. (A) is a waveform diagram of a timer of the first control device 200, (B) is an input processing timing of the first control device 200, (C) is a waveform diagram of a timing trigger from the first to the second control device, (D ) Is a waveform diagram of the timer of the second control device 300, and (E) shows the input processing timing of the second control device 300.

  The first control device 200 transmits a timing trigger to the second control device 300 after performing input processing with a compare match of [1]. The second control device 300 that has received the timing trigger starts a timer, and then self-runs [1] to [3], and stops the self-running timer when [4] starts.

  The second control device 300 starts the self-running timer again upon receipt of a timing trigger from the next control device 200. The input process and the diagnostic process of the second control device 300 are performed after the timing trigger is received and after the self-running timer compare match.

  As shown in the figure, the input processing timing of the first control device 200 and the diagnostic processing timing of the second control device 300 can be obtained by transmitting a timing trigger once at a plurality of input timings (once every four times in the example in the figure). Signal processing can be performed without overlapping.

  The input value mismatch between the control devices at the time of input fluctuation due to the difference in the input processing timings of the first and second control devices is absorbed by the above-described comparison and hold processing of PV1 and PV2, so there is no problem.

  In the embodiment, the configuration in which the first control device 200 is reset from the second control device 300 side has been described. However, the first control device is more sensitive to an error (error 2) between PV [1] and PV [2]. An operation in which the switch means 209 of the path for notifying the PV value from 200 is forcibly restricted to OFF can also be substituted.

  In the embodiment, the configuration in which the diagnosis is executed on the second control device 300 side has been described. However, a diagnosis process on the first control device 200 side is added, and the diagnosis result and the second control on the first control device side are added. It is also possible to perform PV value hold processing and abnormality notification operation based on the logical sum of the diagnosis results on the apparatus side.

Moreover, although the case where the PV value is notified from the first control device 200 to the PV value holding unit 700 is illustrated, the notification of the PV value is not limited thereto, and the PV value is sent from the second control device 300 to the PV value holding unit 700. It is also possible to provide two PV value holding means and notify the PV value holding means from both the first and second control devices.
Further, the diagnostic means 600 is not always necessary.

It is a functional block diagram which shows the basic composition of the input module to which this invention is applied. It is the functional block diagram which showed the internal structure of the 1st control apparatus and 2nd control apparatus in FIG. It is a time chart explaining operation | movement of the self-propelled timer with which a 1st control apparatus and a 2nd control apparatus are provided. It is a functional block diagram which shows the basic composition of the conventional input module currently disclosed by patent document 1. FIG. FIG. 5 is a functional block diagram illustrating an internal configuration of a control device in FIG. 4.

Explanation of symbols

DESCRIPTION OF SYMBOLS 100 Input module 200 1st control apparatus 300 2nd control apparatus 400 1st input means 500 2nd input means 600 Diagnosis means 700 PV value holding means

Claims (6)

In an input module that takes a digital input signal and holds it as a PV value,
Holding the input signal as a raw input value, and having a first control device and a second control device connected to each other by an inter-device communication function;
The first control device and the second control device are:
First and second DI value holding means for holding the raw input values captured respectively as DI values;
When the held DI value is used as the input value equalized PV value, the input value equalized PV value of the self is compared with the input value equalized PV value received from the other party, and the two values match. Includes first and second comparison processing means for holding this as a device-equalized PV value;
First, a device-equalized PV value held in the first and second comparison processing means is received, and the own device-equalized PV value is compared with the device-equalized PV value received from the counterpart. First and second recomparison processing means;
With
If the comparison result of at least one of the first and second re-comparison processing means is coincident, the inter-device equalization PV value held in one or both of the first control device and the second control device is obtained. An input module that holds the PV value . 2. The input according to claim 1, wherein the first and second comparison processing units and the first and second re-comparison processing units output an error signal when a mismatch of comparison results continues for a predetermined period. module. The second control device includes:
3. The input module according to claim 1, wherein if the comparison result of the second re-comparison processing means does not match, a reset signal is output to the first control device. The second control device includes:
4. The signal according to claim 1, wherein if the comparison result of the second recomparison processing means does not match, a signal for preventing the PV value from being held is output to the first control device. 5. Input module. The first control device and the second control device are:
The self-propelled timer means for regulating the timing of signal processing, respectively, and the timer of the second control device is started by a timing trigger notification from the first control device to the second control device. 5. The input module according to any one of 4. Diagnosis is performed on the input signal, raw input values are taken in the first control device and the second control device in the case of normal diagnosis, and the previous fetched value is held in the case of abnormality diagnosis 6. The input module according to claim 1, further comprising means.

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