JP3447589B2 - Communication control device and two-word connected data receiving system - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a communication control device for cyclically transmitting data from a slave station via a line in a wide area monitoring control system and the like, and a 2-word concatenated data receiving system.

[0002]

2. Description of the Related Art FIG. 8 is a block diagram showing a communication control device having a function of collecting cyclic data from a slave station. In the figure, 1 is a communication control device having a data collection function for cyclic data, 2 is a slave station for transmitting cyclic data, and 3 is a cyclic device for transmitting cyclic data from the slave station 2 to the communication control device 1. It is a data line. FIG. 9 is a diagram showing a data receiving system of the communication control device. In the figure, reference numeral 4 denotes a data receiving unit of the communication control device 1, which has a reception buffer 5. A data processing unit 6 of the communication control device 1 collects data received from the data receiving unit 4 and notifies the host device of the data.

FIG. 10 is a diagram for explaining 2-word concatenated data. FIG. 11 is a diagram showing a conventional 2-word concatenated data reception method. In FIG. 11, reference numeral 7 is a concatenation buffer of the data receiving unit 4. FIG. 12 is a diagram showing a receiving operation when receiving is started from a subsequent word of the conventional 2-word concatenated data. FIG. 13 is a diagram showing a receiving operation when a word defect of conventional 2-word concatenated data occurs.

Next, the operation will be described. As shown in FIG. 9, in the communication control device 1, the data receiving unit 4 receives cyclic data of word 1 to word N from the line, collects the data received from the data receiving unit 4, and notifies the host device. It has a data processing unit 6 for performing.
Each time the data receiving unit 4 receives word data from the line, it stores it in the receiving buffer 5 and notifies the data processing unit 6 only when the number of received words reaches the word number N of one cycle (one cycle reception ), And the reception is restarted from the first word, so that fixed-cycle reception is performed for each cycle.

Next, referring to FIG. 10, the 2-word concatenated data will be described. Two-word concatenated data is a word (hereinafter referred to as a preceding word; word 1 in FIG. 10) and a word received immediately after that (a subsequent word, word 2 in FIG. 10).
Refers to data treated as one data. Even missing Therefore either word data, the two words concatenated data is not established, it must disable. As shown in FIG. 11, when the word is received and the word is the preceding word of the 2-word concatenated data, the data reception method of the 2-word concatenated data is as follows.
Is stored in the position of, and if the next received word is the subsequent word, it is stored in the position of word 2 in the concatenation buffer 7, and when word 1 and word 2 are received, they are transferred as concatenated data and stored in the reception buffer 5. To do. After that, when up to the word N is received, the upper device is notified that one cycle of reception has been performed.

[0006]

In such a two-word concatenated data receiving method, when the reception is started from the succeeding word such as the moment when the line is connected, the two-word concatenated data is not received in the first one-cycle reception. There was a problem in that the data could not be received and it was necessary to wait until the second one cycle reception, and the data reception was delayed by one cycle. A conventional receiving method in this case will be described with reference to FIG. If it is uncertain which word is to be received due to line switching due to line duplication, if reception is started from the subsequent word, the preceding word is not received in the first subsequent word (word 2) reception. Since this is a subsequent word reception at time, it is discarded (1 in FIG. 12).
2-1). Thereafter, when word 1 is received, word 1 is stored in the concatenation buffer, but not stored in the reception buffer (two-word concatenation is not established, 12- in FIG. 12).
2). At this time, the number of words in one cycle is reached, so 1
Cycle reception is performed, but words 1 and 2 are stored in the reception buffer.
Is not stored, the initial value (12-3 in FIG. 12) is notified, and correct two-word concatenated data cannot be received in the first one-cycle reception. In the second one-cycle reception, when word 2 is received, word 1 is preceded by word 1.
Is received, the 2-word concatenation is established. Therefore, after storing word 2 in the concatenation buffer, word 1,
2 is stored in the reception buffer (12-4 in FIG. 12). After that, when word 1 is received, the number of words in one cycle has been reached, so the second one-cycle reception is notified.
At this time, since the 2-word concatenated data is stored in the reception buffer, the 2-word concatenated data can be received after the second time. The second and subsequent one-cycle receptions are performed in the same manner as the second reception.

In addition, when receiving two-word concatenated data, if one of the two words is defective and cannot be received, the two-word concatenated data cannot be received in the reception cycle. A conventional receiving method in this case will be described with reference to FIG. If the word when the first succeeding word is received (word 2) becomes defective, word 2 is discarded (13-1), and two-word concatenation is not established. Therefore, words 1 and 2 are not stored in the receive buffer. After that, when word 5 is received, the number of words in one cycle is reached, so one cycle of reception is performed, but since words 1 and 2 are not stored in the receive buffer, the initial value is notified, and in this cycle, The 2-word concatenated data cannot be received correctly. If words 1 and 2 are normal in subsequent cycles,
The 2-word concatenated data can be received in that cycle.

The present invention has been made to solve the above problems, and in receiving cyclic data having 2-word concatenated data, data collection is stable even in a cycle in which 2-word concatenation is not established. The first object is to obtain a communication control device that can be performed in this way. A second object is to obtain a two-word concatenated data reception system that can receive data even in a cycle in which two-word concatenation is not established in reception of cyclic data having two-word concatenated data.

[0009]

In a communication control device according to the present invention, a data processing unit for collecting data and notifying a host device, and a reception configured so that each word of one cycle is stored at a predetermined position. The buffer and the concatenated buffer configured to store the leading word and the trailing word of the concatenated data in predetermined positions, and when the leading word and the trailing word are stored in the concatenated buffer, the concatenated data of the concatenated buffer is received by the receiving buffer. And a data receiving unit that notifies the data processing unit of the reception of one cycle when a word of one cycle is stored in the reception buffer, and the reception of the data receiving unit is started from the succeeding word of the concatenated data. In this case, n words starting from the word next to the subsequent row word are used as the first reception cycle.

Further, a data processing unit for collecting data and notifying the host device, a reception buffer configured to store each word of one cycle at a predetermined position, and a preceding word and a succeeding word of concatenated data at a predetermined position. A concatenation buffer configured to store, and when the concatenation buffer stores a preceding word and a subsequent word, concatenate data of the concatenation buffer is transferred to the reception buffer, and a word of one cycle is stored in the reception buffer. When the subsequent word of the concatenated data to be received is defective, one word of n words starting from the next word of the defective subsequent word is received in one reception cycle. It is what

Further, a data processing unit for collecting data and notifying the host device, a reception buffer configured to store each word of one cycle at a predetermined position, and a preceding word and a succeeding word of concatenated data at a predetermined position. A concatenation buffer configured to store, and when the concatenation buffer stores a preceding word and a subsequent word, concatenate data of the concatenation buffer is transferred to the reception buffer, and a word of one cycle is stored in the reception buffer. When the preceding word or the succeeding word of the concatenated data to be received is defective, the concatenated data of the previous cycle is used instead of the defective concatenated data. 1 reception cycle.

Further, a data processing unit for collecting data and notifying it to a host device, a reception buffer configured to store each word of one cycle at a predetermined position, and a preceding word and a succeeding word of concatenated data at a predetermined position. A concatenation buffer configured to store, and when the concatenation buffer stores a preceding word and a subsequent word, concatenate data of the concatenation buffer is transferred to the reception buffer, and a word of one cycle is stored in the reception buffer. When the data is received, the data processing unit for notifying the data processing unit of one-cycle reception is provided, and when the preceding word or the succeeding word of the received concatenated data is defective, the concatenated data of the previous cycle is used instead of the defective concatenated data. When 1 reception cycle is formed, 1 is added with additional information indicating that it is the concatenated data of the previous cycle.
The cycle reception is notified to the data processing unit.

The additional information is attached to each word. In addition, the data receiving unit has a counter that counts from 1 to n, and the reception cycle of n words starting from the next word of the succeeding word is performed by clearing the counter to zero when the succeeding word is received. It is a thing. The concatenated data in the previous cycle is obtained by not clearing the reception buffer when the data receiving unit receives one cycle. Further, in the 2-word concatenated data receiving system according to the present invention,
When reception starts from the second word of the concatenated data,
The first reception cycle is n words starting from the word following the succeeding word.

Furthermore, when the succeeding word of the concatenated data to be received is defective, n words starting from the word next to the defective succeeding word are set as one reception cycle. When the preceding word or the succeeding word of the received concatenated data is defective, the concatenated data of the preceding cycle is used instead of the defective concatenated data to complete one reception cycle.
Also, if one received cycle is formed by using the concatenated data of the previous cycle instead of the defective concatenated data due to a defect in the preceding word or the succeeding word of the concatenated data to be received, it should be noted that it is the concatenated data of the previous cycle. The additional information shown is added to notify the data processing unit of one-cycle reception.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiment 1. Embodiment 1 of the present invention will be described below with reference to the drawings. 1 is a flow chart for explaining a 2-word concatenated data receiving system according to Embodiment 1 of the present invention. FIG. 2 is a diagram for explaining a receiving operation when receiving is started from the succeeding word of the 2-word concatenated data according to the first embodiment of the present invention. Since the communication control device using the 2-word concatenated data reception system of the first embodiment has the same configuration as that shown in FIGS. 9 and 11, its description is omitted.

The 2-word concatenated data reception system of the first embodiment will be described with reference to FIG. If the word received in step ST1-1 is the preceding word of the two-word concatenated data, the succeeding word, or any other word, and if it is the succeeding word, step ST1
At -2, it is verified whether the word is the reception start word in this cycle. If the received word is the subsequent word of the 2-word concatenated data and is the word received immediately after the start of reception, the received word counter is decremented by 1 in step ST1-3 to set 1 in this cycle.
Cycle reception will receive one word more. In step ST1-4, one cycle of reception is performed at the timing when one word more than the number of words in one cycle is received.

Next, the receiving operation will be described with reference to FIGS. 1 and 2 by taking the case where the number of words in one cycle is 5 as an example. First, when word 2 is received immediately after the start of reception, the word 2 is recognized as a subsequent word of the 2-word concatenated data. Since the word 2 is received immediately after the start of reception, the reception word counter is decremented by 1 and set to zero. In step ST1-5, since the preceding word has not been received immediately before, word 2 is discarded (FIG. 2).
2-1). After that, the words 3, 4, and 5 are stored in the reception buffer (2-2 in FIG. 2) as reception other than the 2-word concatenated data in step ST1-6.

Thereafter, when word 1 is received, it is recognized as a preceding word of the 2-word concatenated data, and step ST1-
Store word 1 in the concatenation buffer at 6 (2-3 in FIG. 2)
To do. Next, when word 2 is received, the word 2 is recognized as the succeeding word of the 2-word concatenated data, and since the word 1 of the preceding word is received immediately before, the 2-word concatenation is established, and steps ST1-7, ST1-7, In step ST1-8, after storing word 2 in the concatenation buffer (2-4 in FIG. 2),
The 2-word concatenated data of words 1 and 2 is stored in the reception buffer (2-5 in FIG. 2). At this point, the receive word counter indicates the number of words in one cycle (words 3, 4, 5, 1,
2 5 words), the reception buffer has received 1 cycle in step ST1-10, and the 2-word concatenated data can be received from the cycle when the reception is started.

Embodiment 2. Embodiment 2 of the present invention will be described below with reference to the drawings. FIG. 3 is a flow chart for explaining a 2-word concatenated data reception system according to the second embodiment of the present invention. FIG. 4 is a diagram for explaining a receiving operation when a word defect of 2-word concatenated data occurs according to the second embodiment of the present invention. In the first embodiment,
The case where the word immediately after the start of reception is the succeeding word of the two-word concatenated data has been described, but the second embodiment relates to the case where the succeeding word of the two-word concatenated data is defective.

As shown in FIG. 3, when a word defect is detected in the subsequent word reception (step ST3-1), the received word counter is initialized (step ST3-).
2) Then, by receiving the number of words in one cycle after that, it is possible to avoid the lack of reception of the two-word concatenated data in the cycle in which the two-word concatenated data is not established due to the subsequent word failure.

Next, the reception operation will be described with reference to FIGS. 3 and 4 by taking the case where the number of words in one cycle is 5 as an example. When the subsequent word (word 2) of the 2-word concatenated data is received, the word defect is detected in step ST3-1. At that time, the received word counter is initialized to zero in step ST3-2, and the word is discarded (4-1 in FIG. 4). Then words 3, 4, 5
When ST is received, the received word is stored in the reception buffer from step ST3-3 (4-2 in FIG. 4). After that, when word 1 is received, it is stored in the concatenation buffer in step ST3-4 as the preceding word of the 2-word concatenated data (see FIG. 4).
4-3), the next word 2 is received, and the 2-word concatenated data is established as the succeeding word reception immediately after the reception of the preceding word of the 2-word concatenated data, and the concatenation is performed in steps ST3-5 and ST3-6. Store in buffer (4-4 in Fig. 4)
After that, the 2-word concatenated data is stored in the reception buffer (4-5 in FIG. 4). At this point, the receive word counter reaches the number of words in one cycle (words 3, 4,
Therefore, the reception buffer has received one cycle in step ST3-7, and it is possible to avoid the reception omission of the two-word concatenated data in the subsequent word defective cycle.

Embodiment 3. Embodiment 3 of the present invention will be described below with reference to the drawings. FIG. 5 is a flowchart illustrating a 2-word concatenated data receiving system according to the third embodiment of the present invention. FIG. 6 is a diagram illustrating a receiving operation when a word defect occurs according to the third embodiment of the present invention. In the second embodiment, the case of avoiding the reception omission when the two-word concatenated data is not established due to the subsequent word defect is described, but in the third embodiment, as shown in FIG. 5, the initialization of the reception buffer after the reception of one cycle is performed. By doing so (step ST5-1), even if either or both of the two-word concatenated data has a word defect, the previously received two-word concatenated data is used to The word concatenated data may be received at regular intervals.

Next, the receiving operation will be described with reference to FIGS. 5 and 6 by taking the case where the number of words in one cycle is 5 as an example. When the preceding word (word 1) of the 2-word concatenated data is received, the word defect is detected in step ST5-2. At that time, the word is discarded (6-1 in FIG. 6). After that, even if the succeeding word (word 2) is received, the preceding word is defective and the two-word concatenation is not established, and the word is discarded (6-in FIG. 6).
2) Do. If you then receive words 3, 4, and 5,
From step ST5-3, the received word is stored in the reception buffer (6-3 in FIG. 6). At this point, the received word counter reaches the number of words in one cycle (words 1, 2,
Therefore, the contents of the receiving buffer are received for one cycle in step ST5-6. Since the previous value of the 2-word concatenated data is notified, the 2-word concatenated data can be received at regular intervals without setting the initial value even in the cycle in which the 2-word concatenation is not established.

In step ST5-2, if the received word is normal, the received word is stored in the concatenation buffer (step ST5-4), and if the preceding word and the succeeding word are stored in the concatenation buffer, The 2-word concatenated data of the concatenation buffer is stored in the reception buffer (step ST5-
5).

Fourth Embodiment Embodiment 4 of the present invention will be described below with reference to the drawings. FIG. 7 is a diagram for explaining a 2-word concatenated data receiving system according to the fourth embodiment of the present invention. In the fourth embodiment, by notifying the information as to whether or not the previous value is used for each word, as additional information different from the word, it becomes possible for the host device to distinguish each time one cycle is received.

Next, the receiving operation will be described with reference to FIG. 7 by taking the case where the number of words in one cycle is 5 as an example. In the reception system of FIG. 6 in the third embodiment, it is not possible for the higher-level device to distinguish whether the word for 1-cycle reception uses the previous value. Therefore, each time a word is received, it is recorded in the additional information whether or not it has been discarded. First, when a word is discarded due to a word defect (7-1 and 7- in FIG. 7).
2), the information that is the previous value in receiving the words 1 and 2 is the additional information. When words 3, 4, and 5 are received and stored in the reception buffer (7-3 in FIG. 7), word 3,
In the case of receiving 4 or 5, the information that it has been updated is reflected in the additional information, and the word and the additional information are notified to the higher-level device in one cycle of reception. In the first to fourth embodiments,
I explained the method of receiving 2-word concatenated data.
It goes without saying that this method can be applied to the data receiving unit of the communication control device as shown in FIG.

[0027]

Since the present invention is constructed as described above, it has the following effects. A data processing unit that collects data and notifies the upper-level device, a reception buffer configured to store each word of one cycle in a predetermined position, and a preceding word and a subsequent word of concatenated data stored in a predetermined position A concatenated buffer, the concatenated buffer stores the preceding word and the subsequent word, transfers the concatenated data of the concatenated buffer to the receive buffer, and stores one cycle of the word in the receive buffer. The data receiving unit for notifying the data processing unit of the cycle reception is provided, and when the reception of the data receiving unit is started from the succeeding word of the concatenated data, the n words starting from the next word of the succeeding row word are first received cycle. Therefore, even if the reception is started from the second word after the 2-word concatenated data, the concatenated data can be received from the first reception cycle. That.

In addition, a data processing unit for collecting data and notifying it to a host device, a reception buffer configured to store each word of one cycle at a predetermined position, and a preceding word and a succeeding word of concatenated data at predetermined positions. A concatenation buffer configured to store, and when the concatenation buffer stores a preceding word and a subsequent word, concatenate data of the concatenation buffer is transferred to the reception buffer, and a word of one cycle is stored in the reception buffer. When the subsequent word of the concatenated data to be received is defective, one word of n words starting from the next word of the defective subsequent word is received in one reception cycle. Therefore, even if the succeeding word of the concatenated data becomes defective, it is possible to avoid the missed cycle of reception of the concatenated data.

Further, a data processing unit for collecting data and notifying the host device, a reception buffer configured to store each word of one cycle at a predetermined position, and a preceding word and a succeeding word of concatenated data at a predetermined position. A concatenation buffer configured to store, and when the concatenation buffer stores a preceding word and a subsequent word, concatenate data of the concatenation buffer is transferred to the reception buffer, and a word of one cycle is stored in the reception buffer. When the preceding word or the succeeding word of the concatenated data to be received is defective, the concatenated data of the previous cycle is used instead of the defective concatenated data. Since one reception cycle is set, reception can be performed at fixed time intervals.

Further, a data processing unit for collecting data and notifying the host device, a reception buffer configured to store each word of one cycle at a predetermined position, and a preceding word and a succeeding word of concatenated data at a predetermined position. A concatenation buffer configured to store, and when the concatenation buffer stores a preceding word and a subsequent word, concatenate data of the concatenation buffer is transferred to the reception buffer, and a word of one cycle is stored in the reception buffer. When the data is received, the data processing unit for notifying the data processing unit of one-cycle reception is provided, and when the preceding word or the succeeding word of the received concatenated data is defective, the concatenated data of the previous cycle is used instead of the defective concatenated data. When 1 reception cycle is formed, 1 is added with additional information indicating that it is the concatenated data of the previous cycle.
Since the data processing unit is notified of the cycle reception, it can be recognized that the data processing unit and the host device are using the concatenated data of the previous cycle.

Further, since the additional information is attached to each word, it can be recognized that the data processing unit and the host device are using the concatenated data of the previous cycle. In addition, the data receiving unit has a counter that counts from 1 to n, and the reception cycle of n words starting from the next word of the succeeding word is performed by clearing the counter to zero when the succeeding word is received. Therefore, one cycle can be easily formed.

Since the concatenated data of the previous cycle is obtained by not clearing the reception buffer when the data receiving unit receives one cycle, extra time is not required and the concatenated data of the previous cycle is easily obtained. be able to. In addition, in the 2-word concatenated data reception method, when the reception is started from the succeeding word of the concatenated data, the n words starting from the word next to the succeeding word are set as the first reception cycle, and thus the 2-word concatenated data is Even when the reception is started from the succeeding word, the concatenated data can be received from the first reception cycle.

Furthermore, when the succeeding word of the concatenated data to be received is defective, n words starting from the word next to the defective succeeding word are set as one reception cycle, so that the succeeding word of the concatenated data becomes defective. In this case, it is possible to avoid a missed cycle of receiving concatenated data. Further, when the preceding word or the succeeding word of the concatenated data to be received is defective, the concatenated data of the previous cycle is used instead of the defective concatenated data to form one reception cycle, so that the reception can be performed at a constant time interval. .

When one reception cycle is formed by using the concatenated data of the previous cycle instead of the defective concatenated data due to a defect in the preceding word or the succeeding word of the concatenated data to be received, the concatenated data of the preceding cycle is used. Since the one-cycle reception is notified to the data processing unit by adding the additional information indicating that the data is present, the data processing unit can recognize that the concatenated data of the previous cycle is used.

[Brief description of drawings]

FIG. 1 is a flowchart of a receiving method when receiving is started from a succeeding word of two-word concatenated data according to the first embodiment of the present invention.

FIG. 2 is a diagram illustrating a receiving operation when receiving is started from a subsequent word of two-word concatenated data according to the first embodiment of the present invention.

FIG. 3 is a flowchart of a receiving method in the case where a word defect occurs in 2-word concatenated data according to the second embodiment of the present invention.

FIG. 4 is a diagram illustrating a receiving operation when a word defect occurs in 2-word concatenated data according to the second embodiment of the present invention.

FIG. 5 is a flowchart of a receiving method in the case where a word defect occurs in 2-word concatenated data according to the third embodiment of the present invention.

FIG. 6 is a diagram for explaining a receiving operation when a word defect occurs according to the third embodiment of the present invention.

FIG. 7 is a diagram illustrating a receiving operation in the case where a word defect occurs in 2-word concatenated data according to the fourth embodiment of the present invention.

FIG. 8 is a configuration diagram showing a communication control device equipped with a function of collecting cyclic data from a slave station.

FIG. 9 is a diagram showing a data receiving system of the communication control device.

FIG. 10 is a diagram illustrating 2-word concatenated data.

FIG. 11 is a diagram showing a method of receiving 2-word concatenated data.

FIG. 12 is a diagram showing reception when the reception is started from the succeeding word of the conventional 2-word concatenated data.

FIG. 13 is a diagram showing reception when a word defect of conventional 2-word concatenated data occurs.

[Explanation of symbols]

1 communication control device, 2 slave stations, 3 cyclic data line, 4 data receiving section, 5 receive buffer,
6 data processor, 7 concatenation buffer.

Claims (11)

(57) [Claims] 1. An n word (n is a positive integer) containing concatenated data in which two words of a preceding word and a succeeding word are concatenated.
In a communication control device that receives cyclic data having one cycle as a cycle and notifies collected data to a higher-level device, a data processing unit that collects data and notifies the higher-level device, each word of one cycle is stored at a predetermined position. And a concatenation buffer configured to store the preceding word and the succeeding word of the concatenated data at predetermined positions, and when the preceding word and the succeeding word are stored in the concatenated buffer, The concatenated data in the concatenation buffer is transferred to the reception buffer and at the same time 1
When the word of the cycle is stored, the data processing unit is provided for notifying the data processing unit of one cycle reception, and when the reception of the data receiving unit is started from the subsequent word of the concatenated data, the subsequent word The communication control device is characterized in that n words starting from the next word of are the first reception cycle. 2. An n-word (n is a positive integer) including concatenated data in which two words of a preceding word and a succeeding word are concatenated.
In a communication control device that receives cyclic data having one cycle as a cycle and notifies collected data to a higher-level device, a data processing unit that collects data and notifies the higher-level device, each word of one cycle is stored at a predetermined position. And a concatenation buffer configured to store the preceding word and the succeeding word of the concatenated data at predetermined positions, and when the preceding word and the succeeding word are stored in the concatenated buffer, The concatenated data in the concatenation buffer is transferred to the reception buffer and at the same time 1
When a word of a cycle is stored, the data processing unit is provided for notifying the data processing unit of reception of one cycle, and when the succeeding word of the received concatenated data is defective, the next word of the defective succeeding word is provided. A communication control device, wherein n words starting from 1 are set as one reception cycle. 3. An n-word (n is a positive integer) including concatenated data in which two words of a preceding word and a succeeding word are concatenated.
In a communication control device that receives cyclic data having one cycle as a cycle and notifies collected data to a higher-level device, a data processing unit that collects data and notifies the higher-level device, each word of one cycle is stored at a predetermined position. And a concatenation buffer configured to store the preceding word and the succeeding word of the concatenated data at predetermined positions, and when the preceding word and the succeeding word are stored in the concatenated buffer, The concatenated data in the concatenation buffer is transferred to the reception buffer and at the same time 1
When a word of a cycle is stored, a data receiving unit is provided to notify the data processing unit of one-cycle reception, and when the preceding word or the succeeding word of the received concatenated data is defective, it is replaced with the defective concatenated data. The communication control device is characterized in that one reception cycle is performed by using the concatenated data of the previous cycle. 4. An n-word (n is a positive integer) including concatenated data in which two words of a preceding word and a succeeding word are concatenated.
In a communication control device that receives cyclic data having one cycle as a cycle and notifies collected data to a higher-level device, a data processing unit that collects data and notifies the higher-level device, each word of one cycle is stored at a predetermined position. And a concatenation buffer configured to store the preceding word and the succeeding word of the concatenated data at predetermined positions, and when the preceding word and the succeeding word are stored in the concatenated buffer, The concatenated data in the concatenation buffer is transferred to the reception buffer and at the same time 1
When a word of a cycle is stored, the data processing unit is provided for notifying the data processing unit of one cycle reception, and the defective concatenated data is replaced by the defective concatenated data preceding or succeeding word. When one receive cycle is formed using the concatenated data of the previous cycle,
A communication control device characterized by notifying a data processing unit of reception of one cycle by adding additional information indicating that the data is the connected data of the previous cycle. 5. The communication control device according to claim 4, wherein the additional information is attached to each word. 6. The data receiving unit has a counter that counts from 1 to n, and in a reception cycle of n words starting from a word next to a succeeding word, the counter is cleared to zero when the succeeding word is received. The communication control device according to claim 1, wherein the communication control device is performed by 7. The communication control device according to claim 3, wherein the concatenated data of the previous cycle is obtained by not clearing the reception buffer when the data receiving unit receives one cycle. 8. A concatenation buffer configured to store a preceding word and a succeeding word of two-word concatenated data included in cyclic data having n words (n is a positive integer) as one cycle, in a predetermined position. When the preceding word and the succeeding word are stored in the concatenation buffer, the concatenation data of the concatenation buffer is stored in the reception buffer. In the two-word concatenated data reception method of notifying the data processing unit of one-cycle reception when the word of one cycle is stored in the reception buffer while being transferred, when the reception is started from the subsequent word of the concatenation data. Is a two-word concatenated data, characterized in that the first reception cycle is n words starting from the word next to the following word. Receiving method. 9. A concatenation buffer configured to store a preceding word and a succeeding word of two-word concatenated data included in cyclic data having n words (n is a positive integer) as one cycle in a predetermined position, When the preceding word and the succeeding word are stored in the concatenation buffer, the concatenation data of the concatenation buffer is stored in the reception buffer. In the two-word concatenated data reception method of notifying the data processing unit of the reception of one cycle when a word of one cycle is stored in the reception buffer while being transferred, when the succeeding word of the concatenated data to be received is defective, A two-word concatenated data receiving method, wherein n words starting from the word next to the defective succeeding word are set as one reception cycle. . 10. A concatenation buffer configured to store a preceding word and a succeeding word of two-word concatenated data included in cyclic data having n words (n is a positive integer) as one cycle in a predetermined position, When the preceding word and the succeeding word are stored in the concatenation buffer, the concatenation data of the concatenation buffer is stored in the reception buffer. In the two-word concatenated data reception method of notifying the data processing unit of the reception of one cycle when a word of one cycle is stored in the reception buffer while being transferred, the preceding word or the succeeding word of the concatenated data to be received is defective. In this case, the concatenated data of the previous cycle is used instead of the defective concatenated data to make one reception cycle. Word concatenated data reception method. 11. A concatenation buffer configured to store a preceding word and a succeeding word of two-word concatenated data included in cyclic data having n words (n is a positive integer) as one cycle, in a predetermined position. When the preceding word and the succeeding word are stored in the concatenation buffer, the concatenation data of the concatenation buffer is stored in the reception buffer. In the two-word concatenated data reception method of notifying the data processing unit of one-cycle reception when a word of one cycle is stored in the reception buffer while being transferred, due to a defect in the preceding word or the succeeding word of the concatenated data to be received. , When one received cycle is formed by using the concatenated data of the previous cycle instead of the concatenated data of the above defect, A two-word concatenated data reception method characterized in that the data processing unit is notified of one-cycle reception with additional information indicating that the data is concatenated data.