JP4006648B2 - Input module - Google Patents

Description

  The present invention provides an input module that has a continuous update cycle, executes an interrupt process for reading a raw input value IN at the timing of an input acquisition cycle, and a task process for processing the read raw input value IN and holding it as a DI value About.

  Prior art documents related to SOE (Sequence Of Event) include the following.

JP 2004-046475 A

  SOE refers to a function that notifies input changes together with the time of occurrence. FIG. 3 is a functional block diagram showing a configuration example of a conventional input module having an SOE function. The input module 10 includes an interrupt processing unit 20, a task processing unit 30, and an SOE event holding unit 40.

  The interrupt processing unit 20 includes a raw input value input unit 21, a raw time value input unit 22, and an event temporary storage processing unit 23. The task processing unit 30 includes a filter processing unit 31, an SOE_DI value holding unit 32, and an SOE_TIM value holding unit 33.

  The raw input value input means 21 acquires an input IN from the field side in an interrupt that occurs at a timing of an input acquisition cycle, and sets this as the raw input value IN. The raw time value input means 22 acquires the input read raw time TIM at the same timing as the input acquisition cycle, and sets this as the raw time value TIM.

  The event temporary storage processing unit 23 compares the raw input value IN with the previously held SOE_DI value, and if there is a change, temporarily stores the raw input value and passes it to the task processing unit 30.

On the other hand, the task processing means 30 executes a DI task process of a normal process (not an interrupt).
In the DI task processing, the raw input value IN passed from the event temporary storage processing unit 23 is processed by the filter processing unit 31. If the input change continues for a predetermined time, the SOE_DI held by the SOE_DI value holding unit 32 is processed. Update the value. The raw time value TIM at this time is passed to the SOE_TIM value holding means 33 to update the SOE_TIM value.

  When the SOE_DI value and the SOE_TIM value are updated, the task processing unit 30 sets them and notifies the SOE event holding unit 40 of them.

  FIG. 4 is a time chart showing the relationship between interrupt processing and task processing, where (A) shows interrupt processing and (B) shows task processing. The signal processing of the input module is executed at a continuous update cycle of time T, and this update cycle is further divided into a plurality of phases (5 in the figure).

  Interrupt processing occurs multiple times (four times in the figure) at an input acquisition period of time τ in each phase. On the other hand, task processing that progresses simultaneously in each phase does not have a synchronous relationship with interrupt processing, and thus may compete with interrupt processing.

  Since task processing needs to perform other processing besides the DI task for updating the SOE_DI value, the processing time of the DI task changes depending on the phase. In some phases, processing time may be insufficient.

In the conventional input module, since both interrupt processing and task processing are executed in each phase, the following problems occur.
(1) Since interrupt processing and DI task processing overlap and the same SOE_DI value is referenced / updated, contention occurs.

(2) Since the DI task processing time varies depending on each phase, there is no SOE_DI value conflict in one phase (eg, phase 1 in FIG. 4), but 3 inputs in another phase (eg, phase 2 in FIG. 4). There is contention for the acquisition timing. That is, the competitive behavior for the SOE_DI value changes depending on the performance of the DI task processing.

(3) The time required for other task processing differs depending on the phase, that is, the processing that can be performed by the interrupt processing time interrupt differs depending on the phase. At this time, if heavy processing is performed in the interrupt processing, task processing may not be completed depending on the phase.

(4) Suppose that all event processing within interrupt processing has been performed at a certain development timing. However, when a DI task processing time change due to a subsequent design change is necessary, the SOE_DI value reference / update conflict pattern changes depending on the DI task processing time, and thus it is necessary to check the operation for each design change.

  Therefore, the problem to be solved by the present invention is to realize an input module in which an input value interruption process and a DI task process for processing the input value essentially do not cause a conflict to refer / update the same value. is there.

(1) In an input module that has a continuous update cycle, executes an interrupt process for reading the raw input value IN at the timing of the input acquisition cycle, and a task process for processing the read raw input value IN and holding it as a DI value ,
Input buffer means for acquiring and storing the raw input value IN for the input acquisition period input in the interrupt processing;
Task processing means for processing the raw input value IN for the input acquisition period held in the input buffer means in the next update period of the input acquisition period or an update period thereafter and holding it as a DI value;
An input module comprising:

(2) The task processing means executes a DI task process for processing a raw input value IN and holding it as a DI value and other processes in each phase divided into a plurality of times within an update cycle. The input module according to (1).

(3) The task processing means compares the raw input value IN with the previously held DI value, filters the change if there is a change, and updates the DI value when the change continues for a predetermined time. The input module according to (1) or 2, wherein

(4) Time buffer means for acquiring and holding the raw time value TIM at the same timing as the input acquisition cycle of the raw input value IN of the input buffer means;
The task processing means holds the raw time value TIM of the time buffer means as a TIM value at an update period next to the input acquisition period or an update period thereafter. (1) to (3) The input module according to any one.

(5) The task processing means sets the held DI value and the TIM value as a set and notifies the SOE event holding means as SOE event information, according to any one of (1) to (4) The input module described.

As is apparent from the above description, the present invention has the following effects.
(1) By buffering the input value for the update period fetched by the interrupt process and executing the DI task process for executing the update to the SOE_DI value in the later update period, the SOE_DI in the interrupt process and the DI task process is executed. It becomes possible to eliminate the conflict of reference / update to the value essentially.

(2) The processing timing can be freely changed by buffering the input value and time value acquired in a certain update cycle and processing in a later update cycle. Therefore, it is possible to flexibly cope with a design change.

  Hereinafter, the present invention will be described in detail with reference to the drawings. FIG. 1 is a functional block diagram showing an embodiment of an input module to which the present invention is applied. The input module 100 includes an interrupt processing unit 200, a task processing unit 300, and an SOE event holding unit 400.

  The interrupt processing unit 200 includes a raw input value input unit 201, a raw time value input unit 202, an input buffer unit 203, and a time buffer unit 204. The task processing unit 300 includes an event temporary storage processing unit 301, a filter processing unit 302, an SOE_DI value holding unit 303, and an SOE_TIM value holding unit 304.

  In the interrupt processing means 200, the raw input value input means 201 acquires the input IN from the field side in the interrupt that occurs at the timing of a certain input acquisition cycle, collects and inputs the update period as the raw input IN It is passed to the buffer means 203. The raw time value input unit 202 acquires the input read time TIM at the same timing as the input acquisition cycle, collects the update period as the raw time value TIM, and passes it to the time buffer unit 204.

  The task processing means 300 executes a DI task process of a normal process (not an interrupt). In the DI task processing, the event temporary storage processing unit 301 compares the raw input value IN sequentially read from the input buffer unit 203 with the previously held SOE_DI value, and if there is an input change, this is sent to the filter processing unit 302. When the change continues for a predetermined time, the SOE_DI value held in the SOE_DI value holding unit 303 is updated.

  At the time of this update, the raw time value TIM held in the time buffer means 204 is read and passed to the SOE_TIM value holding means 304 to update the SOE_TIM value. When the SOE_DI value and the SOE_TIM value are updated, the task processing unit 300 sets them and notifies the SOE event holding unit 400 of them.

  FIG. 2 is a time chart showing the relationship between interrupt processing and task processing, and corresponds to FIG. (A) is an interrupt process, and (B) is a task process. The signal processing of the input module is executed at a continuous update period of time T (in the figure, the update period 1 and the update period 2 are shown), and this update period is further divided into a plurality of phases (5 in the figure). Is done.

  Interrupt processing occurs multiple times (four times in the figure) at an input acquisition period of time τ in each phase. In the update cycle 1, a region P indicated by a bold line is information of the raw input value IN and the raw time value TIM buffered by the input buffer unit 203 and the time buffer unit 204 during the update cycle. Such buffering is continuously executed in each update cycle.

  The feature of the present invention is that the DI task processing for the raw input IN and the raw time TIM buffered in the update cycle 1 in the figure is performed not in the same update cycle 1 but in the next update cycle 2 (or an update cycle after this). The point is to execute.

  Therefore, when attention is paid to a certain update cycle, interrupt and buffering processing for the raw input IN and the raw time TIM and DI task processing for information buffered in the previous update cycle are executed in the update cycle.

  As described above, in the present invention, the DI task processing in the later update cycle is executed for the input value buffered in the previous update cycle, so that the same interrupt processing executed in the later update cycle is performed. There is essentially no contention to reference / update the SOE_DI value for the input.

  In addition, since the process for the input value acquired in the previous update cycle is performed in the later update cycle, the change process can be performed without worrying about the competition of the SOE_DI value for the design change.

  According to the present invention, the DI task processing for the input value is executed at a later update cycle without being executed in real time. Accordingly, the processing is delayed by the time corresponding to the update cycle that has been removed from the DI processing. The application using the SOE information is plant abnormality diagnosis analysis and the like, and since the request for real-time property is low, this response delay is not a problem.

  In the embodiment described above, the input module having the SOE function has been described. However, the present invention can be applied to an input value that does not require a time stamp. In this case, the components related to the raw time value TIM are omitted from the configuration of FIG.

It is a functional block diagram which shows one Embodiment of the input module to which this invention is applied. It is a time chart which shows the relationship between interruption processing and task processing. It is a functional block diagram which shows the structural example of the conventional input module which has a SOE function. It is a time chart which shows the relationship between interruption processing and task processing.

Explanation of symbols

DESCRIPTION OF SYMBOLS 100 Input module 200 Interrupt processing means 201 Raw input value input means 202 Raw time value input means 203 Input buffer means 204 Time buffer means 300 Task processing means 301 Event temporary storage processing means 302 Filter processing means 303 SOE_DI value holding means 304 SOE_TIM value holding Means 400 SOE event holding means

Claims (5)

In an input module that has a continuous update cycle, executes an interrupt process for reading the raw input value IN at the timing of the input acquisition cycle, and a task process for processing the read raw input value IN and holding it as a DI value.
Input buffer means for acquiring and storing the raw input value IN for the input acquisition period input in the interrupt processing;
Task processing means for processing the raw input value IN for the input acquisition period held in the input buffer means in the next update period of the input acquisition period or an update period thereafter and holding it as a DI value;
An input module comprising: The task processing means executes a DI task process for processing a raw input value IN and holding it as a DI value and other processes in each of the phases divided into a plurality of periods within the update cycle. The input module according to 1. The task processing means compares the raw input value IN with the previously held DI value, filters the change if there is a change, and updates the DI value when the change continues for a predetermined time. The input module according to claim 1 or 2. Time buffer means for acquiring and holding the raw time value TIM at the same timing as the input acquisition cycle of the raw input value IN of the input buffer means;
4. The task processing means holds the raw time value TIM of the time buffer means as a TIM value at an update period next to or after the input acquisition period . Input module described in. The task processing means sets the held DI value and TIM value as a set and performs SOE.
5. The input module according to claim 1, wherein the SOE event holding unit is notified as event information.

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