JPS62152245A - Communicating control system - Google Patents

Abstract

PURPOSE:To execute smooth processing in accordance with data contents by providing a receiving buffer memory to accumulate respective receiving data every level to a main control part and a communicating control part, and receiving and operating in accordance with the level of data. CONSTITUTION:At communicating control parts 31 and 32 of communicating devices 51, 52... connected to a transmission line 2 and main control parts 11, 12..., receiving buffer memories 111, 112..., 311, 312... using the special area in respective memories are provided, and at control parts 11, 12..., 31, 32..., shared memories 41, 42... are provided. In accordance with the contents, transmitting receiving data are classified to the level of plural grades in accordance with the contents and accumulated to the memories 111, 112... for a level. When the block of the level of either of the memories 111, 112... comes to be full, a receiving holding flag is set from the control parts 11, 12... to the memories 41, 42... and the receiving data are accumulated to the block of the same level of the memories 311, 312.... When the memories 111, 112..., 311, 312... come to be full, the block of a certain level interrupts the transmission from the opponent side.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a communication control system in which a main control unit having a judgment processing function transmits and receives data to and from a counterpart party.

[Conventional technology]

In building management control equipment, process control equipment, etc., each piece of equipment installed in a distributed manner is connected by a transmission path, and each piece of equipment performs prescribed control while transmitting and receiving data to and from each other. In order to make local control decisions and control data transmission and reception, each device is equipped with a main control section that has a decision processing function.
This is performed under the control of the main control section via a communication interface that does not have a judgment processing function and is provided between the transmission line and the main control section.

[Problem that the invention seeks to solve]

However, when the main control device is configured with a processor such as a microprocessor, the main control device performs communication control such as sending and receiving data, and therefore requires a program that includes communication procedures such as calling the other party and confirming the response. In addition to increasing the operational load due to the execution of It's causing problems.

Also, if the content of the received data covers various ranges,
A problem has also arisen in which it is necessary to handle these data according to their importance, urgency, etc., and to determine the processing order according to the contents of the received data.

[Means for solving problems]

In order to solve the above-mentioned problems, the present invention is accomplished by the following means.

That is, it includes a communication control unit connected to a transmission path, and a main control unit that sends and receives data classified into multiple levels to the other party via this communication control unit, and also transmits received data to this main control unit. A first receiving buffer memory is provided for multiplying the received data by FF for each level, and a second receiving buffer memory is provided for storing received data in the communication control unit for each level.
In addition, a shared memory for the main control unit and communication control unit is provided,
When a block allocated to any level of the first reception backup memory becomes full, the main controller sets a reception hold flag for that level in the shared memory, and the communication control unit sets the reception hold flag for that level in the shared memory. Received data is stored in a block appropriate for the level of the reception backup memory No. 2, and when this block is also full, the communication control unit transmits a transmission hold signal to the other party to stop transmission.

[Effect]

Therefore, a communication control section provided in addition to the main control section performs various communication controls, and buffer memories for reception are distributed to both control sections, making it unnecessary to provide a separate buffer memory. When both the first and second reception backup memories become full, a transmission hold signal is sent to the other party, which causes the other party to interrupt transmission, so that no more received data arrives.

Further, since the above operations are performed for each level according to the level of the received data, processing according to the contents of the received data is performed smoothly.

〔Example〕

Hereinafter, the present invention will be explained in detail with reference to figures showing examples.

Fig. 1 is a block diagram showing the configuration. reception backup memory (hereinafter,
A communication control unit (hereinafter referred to as CCT 31) similar to the MCTlt connected to the transmission line 2 is provided with a communication control unit (hereinafter referred to as CCT 31) using a specific area in the memory.
and a transmission buffer memory (hereinafter referred to as SBM 321).

In addition, the shared memory between MCTII and CCT31 (hereinafter referred to as
CMM) 4! is provided, for which MCT11
It is now possible to set and reset flags from both the CCT31 and the communication device (
Hereinafter, CE) 51 is configured.

On the other hand, CE52 is also MCT12, CCT32.0M
M42 is configured, and MCT12 has RBMll 2.
, C073g is provided with RBM312 and 88M322 in the same manner as described above, and MCT11.12 transmits and receives data to and from the other party via CCT3s and 3g, respectively, and inputs from various sensors or switches not shown in the figure. It transmits data, makes control decisions based on input data and received data, and also sends output data to controlled equipment (not shown in the figure).

In addition, a larger number of CE5s are connected to the transmission path 2 depending on the situation, and each one communicates with each other as necessary, or transmits the same content to all others, and thereby Overall disciplined controls are in place.

In addition, the MCT 11.12 temporarily stores the received data given from the CCT 31.32 in the RBMll, 112, and sequentially decodes and uses the contents by the CPU, and sends the transmission data to the CCT 31, 32. The CCTs 31 and 32 store this in S8M321.322 and then transmit it to the transmission path 2.
When RBM111, 112 is full of received data, CCT31, 32 accumulates received data in RBM311.312, while when S8M371.322 is full, MCT11, 12 is asked to suspend transmission operation. These MCT11.1 are to be commanded.
2 and CCT31.32, CMM4
1142 This is done by setting a flag.

However, the transmitted and received data is classified into multiple levels according to their content, and the above operations are performed for each level except for the highest priority level.
Accordingly, RBMll.

112.311.312.88M321.322 is divided into blocks, each address corresponding to each level, as shown in FIG. 2, for example.

In the same figure, (A) is RBMI 1, (B) is RBM31, (c
) indicates the contents of 88M32, RBMll, 31 is
Priority level block RBL8 corresponding to the highest priority level
The number of addresses for these is determined according to the amount of received data for each level, and each block RBLS-RBL3 is divided into RBLI-RBLs corresponding to the first to third levels. Each content "λ" is set.

Similarly, 88M32 in (C) is divided into priority level block 5BLS-third level block 5BL3, and the capacity of each is determined according to the amount of data to be transmitted for each level.

Note that the setting of flags for 0MM41 and 0MM42 is also performed for each level, and 0MM41 and 42 each have a capacity of the corresponding number of bits.

FIG. 3 is a comprehensive flowchart of the control situation by the CPU of MCT1, in which the level of received data is determined according to the level code added to it, and the level of the received data is changed to [priority level? J100
1, "4th level? J 1002, "2nd level? J
1003, "4th level? J" 1004 is sequentially determined, and if step tooi is Y (YES), immediately performs the priority level block "RBLS check J1011 of RBMI 1, and determines this [RBLS full? J"]. If this result is Y, the received data at this level is time data, jurisdictional signals, emergency commands, etc., and temporary storage is limited and it is impossible for the data to become full.
Q13 displays an alarm, sends an abnormality signal, etc., but when step 1012 is N (No), the priority level block RBLs of the receiving booter RBMI 1 is displayed.
Step 1001 and subsequent steps are repeated via other routines such as to WffL, decoding it, and performing control operations.

Also, step 1001 is N and step 1002 is Y.
If so, the third level block 5BL3 of RBMll
[Rebel memory check processing J 102 for
1, and step 1002 is also 1 with N) Step 1
When 003 is Y, the second level memory check process J1031 is performed for the second level block RBL2 of RBMll, and if step 1003 is also N and step 1004 is Y, the second level memory check process J1031 is performed for the third level block RBL3 of RBMll. Third level memory check processing J1041 is performed.

Note that the details of steps 1021, 1031, and 1041 will be described later.

FIG. 4 is a flowchart showing the control status (t) by the CPU of the CCT3, in which steps 1001 to 1004 of FIG. 3rd level?J200
4 in sequence, and if step 20o1 is Y, check ``transmission data?
For [Accumulate the transmission data to 5BLS J2012, check "Receive data status?" 2021, and if this is also Y, immediately send the received data from the RBM31 priority level block r RBLS J2022. , forwards the received data to CCTl.

On the other hand, step 2001 is N and step 2002 is Y
If so, the “th rubel block” for each rubel block RBLI and 5BLt of RBM31 and 88M32 is
Perform memory check processing J2031 and proceed to step 20.
02 is also N and step 2003 is Y, RBM
31.88M32 each second level block RBL2.5
“Second level memory check processing J2 for BL2”
041, step 2003 is also N and step 2
If 004 is Y, each third of RBM31.88M32
A "third level memory check process" 2051 is performed for level blocks RBL a and 5BLs, and steps 2001 and subsequent steps are repeated via other routines such as transmission/reception control.

Therefore, the transmitted and received data is operated according to each level in steps 1021, 1031, 1041 and 20.
31.2041.2051, steps 1011 to 10 are performed individually if the priority level is high.
13 and 2011 to 2022 are performed and processed with priority, so that the transmission and reception of these and the response of CCTl are quick.

Note that the details of steps 2031, 2041, and 2051 will be described later.

FIG. 5 shows step 1021.1031.10 of FIG.
In the flowchart showing the details of step 41, "88M check" 101 checks the reception data accumulation status of the block appropriated to the level concerned, and "RBM full? J
102, and if it is Y, send the reception pending flag to 9rCMM according to the flag of the relevant level)J103
When step 102 is N, the corresponding level of 0MM4 [Receive pending flag set? Check J111, and if it is Y, r for 7 lag of the relevant level.
After resetting the CMM's reception pending flag J 112, send an interrupt signal to the rcc'r corresponding to the relevant level.
Sends an interrupt signal of the relevant level to the NT.

Next, "CMM transmission pending flag check" 12 is performed for the flag of the relevant level, which is reset according to the conditions described below.
1, and then set the transmission pending flag?J 12
If step 122 is N, then "transmission is allowed" 124, and if step 122 is N, "transmission is allowed" 124.
If necessary, transmit data at the relevant level to CCT3.
Send to.

Figure 6 shows step 2031.2041.20 in Figure 4.
51 is a flowchart showing the details of step 51, in which the process 202 of ``determine whether the transmission data is set? rSB
M full? J 203 is checked, and when it becomes Y, a transmission pending flag J 211 is set to the r CMM corresponding to the relevant level in accordance with FIG. 5 (D subtub 121).

Next, the message “Received data ah! 5?” addressed to itself from transmission line 2 is sent.
J 221 is determined, and according to Y, the content of the received data is the "transmission hold command" of the level. Similarly, in response to step 222 ON, the corresponding level's "transmission permission command? Perform "Reset" 232.

Therefore, while step 223 causes CCT3 to stop transmitting, step 232 allows C0T3 to resume transmitting.

Further, when step 231 is also N, a "reception pending flag check" 241 of the rCMM is performed corresponding to step 103 in FIG.
Setsu)? J 242 is judged, and if this is KA Y, M
Since the block to be allocated to the relevant level in RBM11 of CTl is a groove bar, the "Accumulate received data to RBM" 251 stores it in the block to be allocated to the relevant level of RBM310, and this is r RBM full? ” 252, the corresponding level of “Transmission hold command/
``Send'' 253 to the other party, and save the corresponding level's ``send pending command, sent flag, and
), perform J254.

On the other hand, in response to N in step 242, the received data is transferred from the block at the relevant level to the MCT1 in step 25.
4, check "Transmission hold command/sent flag set? J 262" of the level concerned, and if this is Y, check "Transmission permission command/send" 263 of the corresponding level in step 231. Go to the side, step 25
Corresponding to step 4, the "transmission hold command/transmitted flag reset" 264 of the corresponding level is performed.

FIG. 7 is a flowchart of the interrupt operation by the CPU of the CCT3 corresponding to step 113 in FIG. shi, RBM3 for MCT1
The received data is transferred from the block of the corresponding level in CCT1.
1, the same level received data is transferred, and the MCT
The received data is processed continuously by the CPU of 0MM4, and the response to the received data is executed smoothly and quickly. By setting the corresponding reception hold flag, the CCT3 stores the received data in the block corresponding to the level of the RBM31, so that reception can be continued and reception failures can be avoided as much as possible. When this is possible and the block of the RBM 31 is also full, a transmission hold command corresponding to the level is sent to the other party, and the other party interrupts transmission in response to this, thereby preventing invalid transmission.

On the other hand, if the blocks allocated to the corresponding level in 88M32 of CCT3 become full, MCT1 will stop sending out the transmission data by setting the transmission pending flag according to the level to 0MM4. transmission is prevented.

Figure 8 shows that three or more CF2s are connected to the transmission line 2, and the transmission line 2 is used in common, and only one of them that has acquired the transmission right performs the transmission, and according to this, the transmission line 2 is connected to the transmission line 2. When each CE5 sequentially starts communication, transmits a transmission right handover signal in response to the end of the communication, and receives this, the other CF2 acquires the transmission right.
In the flowchart of transmission right acquisition control by PU,
Transmission right takeover signal/reception? If J 401 becomes Y, S
"Is there data to send?" for each block in BM324
02, and if this is Y in any block, check the corresponding level "Transmission pending flag set?" 411 in step 223 of FIG. depending on"
It maintains the receiving state by J412 without acquiring the transmission right.

On the other hand, if step 411 is N, the above-mentioned "acquire transmission right" 421 is performed, then "data transmission" 422 is performed, and for each block "SBM full?"
J423 is checked, and if it is N, the CMM transmission pending flag reset J424 is performed for each level as in step 212 in FIG. Repeat.

Therefore, unless the υ transmission permission command is received at step 231 in FIG. will improve.

FIG. 9 is a flowchart showing another embodiment similar to FIG. 6, but in which the transmission and reception of the transmission permission command is omitted and the transmission suspension command is ensured.
J 501 to r Transmit pending flag set to CMM J 511 and [Receive data status? J521,
[Transmission hold command? The steps up to J522 are the same as in FIG. 6, but if step 522 is Y, CCT3's C
According to the "transmission pending timer preset" 523 for each level configured in the PU, after starting this, set the [transmission pending flag/preset] of the level as in step 223.
Serra) Perform J524.

Further, in response to N in step 522, step 241
．． 531 and ``Reception pending flag set?J'' 532 corresponding to the level as in step 53.
When 2 is Y, the received data is RB M
1M product to 541 and r RBM full? 542, and if this is Y, check the "Transmission hold command/sent flag set? J543" of the level in the same way as step 262, and depending on the N of this, check the "Retransmission timer/set of the level"Preset" 551 starts the retransmission timer by the KCPU as in step 523, and the "transmission hold command/send" 55 of the relevant level is started.
2 and “Transmission hold command/sent flag/sera)” J
553 is performed in the same manner as steps 253 and 254.

Note that when step 532 is N, step 261
Same as ``Send received data from RBM'' 561. Next, check ``Transmission pending timer timeout? 4581 is checked, and if this becomes Y, the RBM is full for the lock at the relevant level). 4582, and depending on the Y of this, "retransmission timer 13 set" 591 tl - same as step 551 is performed, and "transmission hold command/send" 592 is performed similarly to step 552, whereas step 582 is If N, "transmission hold command/transmitted flag reset" 593 is performed corresponding to step 553.

Therefore, the transmission suspension state is automatically canceled according to the timeout of the transmission suspension timer, so it is possible to omit the transmission and reception of the transmission permission signal, and it is also possible to check whether the block of the RBM 31 is full or not by the timeout of the retransmission timer. As a result, if the capacity is still full, the transmission suspension command is repeatedly transmitted, so that the transmission suspension command can be reliably transmitted.

In addition, since RBMI 1.31 is provided separately for MCT1 and CCT3, the need to provide a separate buffer memory is eliminated, and since 0CT3 is dedicated for communication, a considerable range of the memory capacity is allocated to RBM31. You can freely appropriate it.

Note that if the block allocated to any level in RBMI 1 of MCT1 is no longer full, the received data of that level is immediately transferred from RBM31 of CCT3 in response to the sending of an interrupt signal, and the received data is processed by the CPU of MCT1. Processing is not interrupted, the MCT1 responds quickly to received data, and the MCT1 does not need to control communication, reducing the operating load and making the control situation faster and wider. 0 In addition, the transmitted and received data is classified into each level, and the above operations are performed for each level, and the above operations are excluded for priority level data, which is treated as the highest priority. Processing according to the content of each data is performed rationally, and in particular, response to priority level data can be sped up.

However, 0MM4 uses DMA (Direct Memory Ac) using MCT1 or CC'T3 memory.
cess, ), RBMll, 3
A register or the like may be applied as 1.88M32°0MM4, and the number of level classifications of each data may be determined according to conditions, and the number and capacity of each block in FIG. 2 may be set accordingly.

However, in FIGS. 3 to 9, various modifications can be made, such as replacing steps or replacing them with other equivalent steps, or omitting unnecessary steps, depending on the conditions. .

〔Effect of the invention〕

As is clear from the above explanation, according to the present invention, MC
In addition to reducing the operating load, there is no need to separately provide a backup memory for received data, improving the control function of the MCT and simplifying the overall configuration, and processing of received data is performed on a level-by-level basis. Since the processing is carried out in a rational order, the response can be made reliably and quickly according to the level, and a remarkable effect can be obtained in various data communication controls.

[Brief explanation of drawings]

The figures show an embodiment of the present invention; FIG. 1 is a block diagram showing the configuration; FIG. 2 is a diagram showing the contents of RBM and SBM; FIG. 3 is a comprehensive flowchart of the control situation by the CPU of the MCT; Figure 4 is a comprehensive flowchart of the control status by the CCT CPU, Figure 5 is a flowchart showing details of Figure 3, Figure 6 is a flowchart showing details of Figure 4, and Figure 7 is a flowchart showing the details of Figure 4. FIG. 8 is a flowchart of transmission right acquisition control by the CPU of the CCT, and FIG. 9 is a flowchart showing another embodiment corresponding to FIG. 6. 11.12@...MCT (main control section), 2...
Transmission line, 31. ．． 32...CCT (communication control unit),
4+, 4z...CMM (shared memory), 51.52
...CE (communication equipment), 11.111.112.3
1.311.312φ...RBM (reception buffer memory), 32.321.322...SBM (transmission buffer memory), INT --- Interrupt input, RBLs,
5BLs *...priority level block, RBLI, 5
BLIII a・Φ 2nd level block, RBL2.5
BL2...0/2nd level block, RBL3.5BL
3...Third level block. Patent applicant Yamatake Honeywell Co., Ltd. Agent Yamakawa
Several flights (2 people) Figure 1 Figure 2 (A) (B) (C) Figure 5

Claims (1)

[Claims] It includes a communication control unit connected to a transmission path, and a main control unit that sends and receives data classified into multiple levels to the other party via the communication control unit, and transmits the received data to the main control unit. A first reception buffer memory is provided for storing the received data for each level, and a second reception buffer memory is provided for storing the received data for each level in the communication control unit, and the main control unit and the communication control unit are shared. A memory is provided, and when a block allocated to any level of the first reception buffer memory becomes full, the main controller sets a reception pending flag for the level in the shared memory,
In accordance with the reception pending flag, the communication control unit stores the received data in a block appropriate to the level of the second reception buffer memory, and when the block is also full, the communication control unit transmits the data to the other party. A communication control method characterized by transmitting a transmission hold signal to cancel the transmission.