JPH07152679A - Process controller - Google Patents

Abstract

PURPOSE:To eliminate the trouble of control due to mismounting and a fault of an ID module by comparing the constitution information number of an IO module with ID information and transmitting the result of comparison to a control arithmetic unit. CONSTITUTION:This process controller consists of a control arithmetic device 1 consisting of a data processing part (MPU) 11 and a transmission control part 12 and input/output devices 2A-2N consisting of a transmission control module 21 and IO modules 22, and both are connected through a transmission line 3. Then pieces of ID information on various IO modules 22 which should be mounted on the control arithmetic unit 1 originally are previously registered and transmitted to the transmission control module 21 of an input/output device, and the transmission control module 21 compares them with ID information on the actually mounted ID modules 22 and transmits the comparison result to the control arithmetic unit 1. Therefore, the trouble such as the mismounting and fault of an IO module 22 can be detected by the transmission control module 21 and necessary abnormality processing can be performed before the control arithmetic of the control arithmetic unit 1 is started.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a process control device constructed by connecting a plurality of types of IO modules mounted in respective slots of a shelf to a control arithmetic unit via a transmission line, and particularly managing the IO modules. The present invention relates to a process control device improved in method so as to efficiently prevent malfunction.

[0002]

2. Description of the Related Art Conventionally, in this type of process control device,
Usually, the ID information stored in the IO module is collected and held by the transmission control module, and this is used as the management information of the IO module to perform the transmission processing of the input / output data with the control arithmetic unit. .

[0003]

As described above, according to the prior art, I
Since it is managed only by the ID information collected from the O module, even if an IO module that is not the type originally to be mounted is erroneously mounted, the input / output transmission process is directly performed with the control arithmetic unit. For example, when the output module is installed where the input module should be originally installed, the control operation is executed without the input data required for control being transmitted to the control operation device. There is a problem that correct control cannot be performed.

Further, when the IO module is not mounted, even if the IO module is intentionally not mounted, the control arithmetic unit is inevitably considered to be abnormal, which hinders the operation of the system. There is also the problem of coming. Therefore, an object of the present invention is to eliminate control problems caused by erroneous mounting and failure of IO modules.

[0005]

In order to solve such a problem, according to the present invention, various IO modules detachably accommodated in each slot of the shelf are connected to one transmission control module by an input / output bus. In a process control device comprising a device and a control arithmetic device connected to the input / output device via a transmission path, the transmission control module includes ID information stored in the IO module and status information of the IO module. Collecting / holding means for collecting and holding management information via the bus; and storing means for storing a conversion table for converting the configuration information number of the IO module given from the control arithmetic unit via the transmission path into ID information. Comparing means for comparing the ID information obtained by conversion by the conversion table with the ID information held in the collecting / holding means; When the configuration information number of the IO module is provided by the control arithmetic unit, the transmission control module converts this to ID information by the conversion table, and then compares it with the ID information collected and held in the collecting / holding means. The comparison result is transmitted to the control arithmetic unit via the transmission path.

According to the present invention, the following items (a) to (i) can be adopted. (A) When it is determined from the management information that the IO module has failed, the IO module is waited for a natural recovery or is removed / removed in an online state to be recovered. (B) The management information collected and held by the transmission control module from the IO module can be updated from the control arithmetic unit via the transmission path.

(C) The update information is information for making the designated slot empty. (D) The update information is information for reserving the designated slot with specific ID information including model information. (E) The update information is information for reserving the designated slot with specific ID information not including the model information. (F) The update information is stored in two IOs of adjacent slots.
Information that indicates that the module is a duplicated pair.

(G) The transmission control module checks the management information collected and held based on the duplicated pair information, and when the ID information of the pair does not match, notifies the control arithmetic unit of the fact. (H) In order to perform redundant control of the operation / standby of the IO module based on the redundant pair information, the transmission control module checks the management information collected and held, and the IO modules of the redundant pair both operate, or Both of them enable detection of an abnormal state that is in a standby state, and when the abnormal state is detected, the control arithmetic unit is notified of predetermined information. (I) Since the redundant control of the operation / standby of the IO module is performed based on the redundant pair information, when it is detected that only one of the pairs is mounted in the transmission control module when the power is turned on, another One of them notifies the control arithmetic unit as a failure.

[0009]

The ID information of various IO modules that should be originally mounted in the control arithmetic unit is registered in advance, and this is transmitted to the transmission control module of the input / output device, and the IO module actually mounted in the transmission control module. ID of
By comparing with the information and transmitting the comparison result to the control arithmetic unit, it is possible to easily determine the erroneous mounting or failure of the IO module, and eliminate the control failure due to the erroneous mounting or failure of the IO module. To do so.

[0010]

FIG. 1 is a system configuration diagram showing an embodiment of the present invention. In the figure, 1 is a data processing unit (MPU)
Control arithmetic unit composed of 11 and transmission control unit 12, 2A
2N are input / output devices including a transmission control module 21 and an IO module 22. That is, the process control device is composed of the control calculation device 1 and the input / output devices 2A to 2N, both of which are connected via the transmission line 3. In addition,
Reference numerals 13 and 23 denote buses.

FIG. 2 shows the flow of information in FIG. That is, for example, in the IO module 22 of the input / output device 2N, the input / output direction (input or output) of IO data, the number of signals (sensors), the data type such as analog / digital, and the module type (for example, temperature sensor). (Type J, type K, etc. are designated as thermocouples)
Is stored, and RAS information indicating normality / abnormality, which is the self-diagnosis result of the module, and status information such as operation / standby in the case of duplication are stored. On the other hand, the control arithmetic unit 1 stores the configuration information number indicating the IO module mounted in each slot of the input / output unit 2N. This configuration information number has a one-to-one correspondence with ID information of various IO modules.

FIG. 3 is a flow chart for explaining the initial processing operation according to the present invention. In the figure, the processing is divided into a control arithmetic unit, a transmission control module and an IO module. First, the IO module carries out self-diagnosis such as ROM sum check and RAM read / write check, and creates status information (step S31). Next, various I's stored in the ROM
The D information is copied onto the RAM and information collection by the transmission control module is waited for (step S32).

On the other hand, the transmission control module sequentially collects the ID information and the status information from each slot via the bus and stores them as IO module management information (step S).
21). In this state, when the configuration information number for each slot is transmitted from the control arithmetic unit (step S11), the transmission control module stores the configuration information number stored in advance → I
ID information for each slot is created by the conversion table of D information, and is managed and saved separately from the management information collected and saved from the IO module (step S22,
S23). Next, the transmission control module compares the ID information for each slot in the management information with the ID information for each slot created from the configuration information number received from the control arithmetic unit, and creates the comparison result information of match or mismatch for each slot. Yes (step S24).

After that, when the control operation device receives the comparison result information from the transmission control module, if the results are all in agreement according to the contents, the control operation is started (see route), and if there is a mismatch. Perform necessary error processing and finish initial processing (see route). If the control importance of each IO module is set in the control arithmetic unit, even if there is a discrepancy in the comparison results, it is possible to execute the control arithmetic by the degenerate operation by disconnecting the IO module. Like

FIG. 4 shows that when the above-mentioned initial processing is normally completed, and the control operation processing and the input / output data update processing, which are normal processing, are being performed in each part of the process control device, an abnormality occurs in the IO module. When it occurs, I
The processing when the O module is replaced online is shown. When the initial processing ends normally and enters the normal processing, the processing of the control arithmetic unit is to execute the control arithmetic based on the transmission of the output data as the result of the control arithmetic and the reception of the input data and the status information from the IO module. A series of processing (steps S11 to S15) of updating the output data as a result is repeatedly performed.

In the IO module, after a self-diagnosis, a series of processes (steps of receiving output data, outputting process, inputting data, transmitting input data and transmitting status information according to the result of self-diagnosis according to its configuration information (step) S
31 to S36) are repeated. Although FIG. 4 shows both the input data and the output data, it goes without saying that only one of them may exist depending on the configuration information of the IO module. Further, the transmission control module gives data from the control arithmetic unit to the IO module, while sending data from the IO module to the control arithmetic unit, and repeats transmission / reception processing of input / output data and status information (see route). ).

A case where a failure occurs in the IO module in this state will be described. That is, in the transmission control module, after the input / output with the IO module and the state information transmission processing, the transmission state and the state information are confirmed, final state information is created and transmitted to the control arithmetic unit (step S21, S22). The meaning of the final status information is that, for example, if the IO module becomes unresponsive during transmission with the transmission control module, a status of IO module abnormality due to transmission control module detection is transmitted to the control arithmetic unit. Is.

Next, a description will be given of the processing when any abnormality of the IO module is detected in the above confirmation processing. First, determine whether the transmission was completed normally,
If the transmission is completed normally, the IO module determines that the transmission function is normal, and repeats the same operation as when there is no abnormality (steps S23 and S24). The reason why the normal processing is performed if the transmission is normally completed even if the status information is abnormal is that it is a minor failure and there is a possibility of recovery.

Next, when the transmission is abnormally terminated including no response, it is determined that the IO module is a fatal failure and needs to be replaced, and the exchange is completed and the transmission is normally performed. , And only the process of collecting ID information is continuously executed (steps S24 to S26). Eventually, when the exchange is completed and there is a response to the collection of the ID information, the transmission control module compares it with the ID information for each slot of the management information collected and stored in the initial processing, and if they match, When it is judged that the online exchange work is completed, the normal data input / output processing and the status information transmission processing are restarted. If the ID information does not match the management information, it is determined that the online replacement work has not been completed, and the collection of ID information is continued (steps S24 to S2).
7).

FIG. 5 is a flow chart for explaining various functions added to the normal processing. As is clear from the figure, as an additional part to the control arithmetic unit,
This is a process that enables transmission of the configuration information number at an arbitrary timing (steps S11 and S12). Since there is no additional processing for the IO module, it is shown as normal processing S3 in the figure. The additional functions of the transmission control module will be mainly described below.

First, when the configuration information number is received from the control arithmetic unit at an arbitrary timing, the transmission control module creates ID information for each slot by the conversion table, and is stored separately from the management information created by the initial process. Rewrite and save. Next, this is compared with the ID information for each slot in the management information to create and save the matching / non-matching information for each slot, and then for each slot I in the management information.
The D information is rewritten to the ID information for each slot created this time (see route).

Next, the match / mismatch information for each slot is checked. If there is a mismatch, the normal input / output processing for that slot is stopped until a match is found, and ID information is collected (step S21, S22). If the IO module responds with the ID information that matches the ID information in the management information, it is determined that the online configuration change is complete, the mismatch information is cleared, the match information is created, and then the normal input is performed. The output process is restarted (steps S21 to S21).
S25).

Until the work of replacing the IO module is completed, the input / output data transmission between the transmission control module and the control arithmetic unit is input or output based on the ID information newly designated by the control arithmetic unit. The dummy data of is created by the transmission control module and transmission is continued. By adding such processing, the management information can be updated online. Further, by adding the same processing to the initial processing, it becomes possible to manage the IO module with a configuration corresponding to the setting of the control arithmetic unit immediately after the power is turned on.

The following may be considered for updating the ID information for each slot. For example, for a designated slot, information indicating that it is empty is designated or added. This makes it possible to treat the IO module slot in the physically existing input / output device as if it does not logically exist.

That is, if the meaning that the IO module slot is vacant is defined in advance for the configuration information number transmitted from the control arithmetic unit, the transmission control module that receives this information will receive the information in the management information. The ID information of the designated slot can be defined as being empty.
Then, in the IO module management by the transmission control module, a slot having an ID of vacant in the management information is excluded from the management and is not accessed at all.

With respect to the update of ID information for each slot, by adding information that means "reserved" to the configuration information number, the IO module actually exists in the IO module slot in the physically existing input / output device. Even if you don't, you can treat it as if it were theoretically present.

In this case, the configuration information number transmitted from the control arithmetic unit is added with the information in advance that the IO module slot is reserved. Upon receiving this information, the transmission control module adds information indicating that it is a reservation when updating the ID information of the designated slot in the management information.

In the IO module management by the transmission control module, the slot having the information of reservation in the management information is used for transmission control when notifying the control arithmetic unit of all abnormal information that occurs during management. Change the information that the module is normal before sending. In this way, by adding the information of reservation, it is possible to handle an IO module that actually fails or does not physically exist as if a normal module virtually exists. Become.

As one of the configuration information numbers in updating the ID information for each slot, prepare information that defines only the input / output points, directions, and types without defining a specific model as a dummy IO module. You can In other words, in IO module management by the transmission control module,
When managing a slot having dummy information in the management information, the model stored in the IO module is excluded from the management target. This way, there is a certain I
Any type of module can be mounted in the O module slot as long as the number of input / output points, direction and type match.

FIG. 6 shows the data flow when the output module and the input module are duplicated. Here, the output modules 221 and 22 of the IO module 22
2 and the input modules 223 and 224 are paired. Duplicated IO modules exchange information with each other, and the operation / standby of the paired IO modules is determined. When the IO module is duplicated, the input / output data in the control arithmetic unit is treated as one data by one pair of duplicated pairs.

The designation of the pair is performed by updating the ID information of each slot by IO of two slots adjacent to the configuration information number.
The module is performed by adding information that means that the module is duplicated. Upon receiving this information, the transmission control module performs the following processing regarding the transmission of input / output data.

First, one piece of output data determined by the arithmetic operation in the control arithmetic unit is notified to the transmission control module in the input / output unit by transmission. The transmission control module that receives this data transmits it to both of the two output modules that are paired based on the information of the duplicated pair.

The input data is processed as follows. Of the input data from the two input modules that make a pair, the input data on the operating side is selected and controlled based on the operation / standby information in the status information that was collected at the same time as the data. Send to arithmetic unit. In this way, by adding the information of the duplicated pair, it becomes possible for the control arithmetic unit to execute the arithmetic operation without being aware of the duplicated or single. Further, the amount of data flowing through the transmission path is the same as that in the case of a single IO module, and does not affect the transmission efficiency.

The transmission control module, which has received the information of the duplicated pair, checks the ID information in the management information collected and stored from the IO module, and if the pair does not have the same ID information, the IO information is input. The status information of the module is transmitted to the control arithmetic unit as the ID information mismatch of the duplicated pair. By performing such processing in the transmission control module, it is possible for the control arithmetic unit to recognize that the ID information of the duplicated set of IO modules is different.

Further, when the transmission control module receives the information of the duplicated pair and processes the input data (transmits the data of the operating module to the control arithmetic unit), it determines the operation / standby between the pairs. When both modules receive the status of operation or standby due to a failure that prevents the transmission or a difference in access time from the transmission control module to the pair, input data cannot be transmitted to the control arithmetic unit. Therefore, the data on the operating side last time or the data registered in advance and considered to be safe for control is transmitted to the control arithmetic unit.

Furthermore, when an IO module abnormality such as no response or reception of an abnormal status is detected in the initial processing after the power supply of the transmission control module is turned on, it is assumed that the information of the duplexed pair is received. If either one of the above is normal, the status of the IO module transmitted to the control arithmetic unit is set as information indicating a one-sided failure, so that the control arithmetic unit can determine that there is no problem in control, and control as a process control unit can be performed. Can be started.

[0037]

According to the present invention, the control arithmetic unit sends the transmission control module a configuration information number indicating which IO module should be installed in the slot of the shelf, while the IO module sends ID information and Since the status information is collected, it is possible for the transmission control module to detect defects such as erroneous mounting and failure of the IO module, and it is possible to perform the abnormal processing required before starting the control calculation of the control calculation device. It is possible to prevent the execution of the control calculation based on the input / output data.

[Brief description of drawings]

FIG. 1 is a system configuration diagram showing an embodiment of the present invention.

FIG. 2 is an explanatory diagram for explaining a flow of information in FIG.

FIG. 3 is a flowchart illustrating an initial process of each unit of the control device.

FIG. 4 is a flowchart illustrating an online IO module replacement process.

FIG. 5 is a flowchart illustrating online ID information update processing.

FIG. 6 is an explanatory diagram illustrating a flow of information when the IO module is duplicated in FIG. 1;

[Explanation of symbols]

1 ... Control arithmetic unit, 11 ... Data processing unit (MPU), 1
2 ... Transmission control unit, 13, 23 ... Bus, 2A, 2B to 2N
... I / O device, 21 ... Transmission control module, 22, 22
1, 222, 223, 224 ... Input / output module, 3 ...
Transmission line.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI Technical indication H04L 12/40

Claims (10)

[Claims] 1. An input / output device in which various IO modules detachably housed in each slot of a shelf are bus-connected to one transmission control module, and a control connected to the input / output device via a transmission path. In a process control device including an arithmetic device, the transmission control module, collection / holding means for collecting and holding management information including ID information stored in the IO module and status information of the IO module via the bus, IO given from the control arithmetic unit via a transmission path
A storage means for storing a conversion table for converting the module configuration information number into ID information, and a comparison for comparing the ID information obtained by the conversion with this conversion table with the ID information held in the collecting / holding means. Means and the configuration information number of the IO module is given from the control arithmetic unit, the transmission control module converts this to ID information by the conversion table, and then collects and holds the ID in the collecting / holding means. A process control device characterized by comparing with information and transmitting the comparison result to a control arithmetic unit via a transmission path. 2. When it is determined from the management information that the IO module has a failure, it waits for a natural recovery or
The process control device according to claim 1, wherein the process control device is detached / attached and restored in an online state. 3. The process control according to claim 1, wherein the management information collected and held by the transmission control module from the IO module can be updated from the control arithmetic unit via a transmission path. apparatus. 4. The process control device according to claim 3, wherein the update information is information for leaving a designated slot in an empty state. 5. The process control apparatus according to claim 3, wherein the update information is information for reserving a designated slot with specific ID information including model information. 6. The process control device according to claim 3, wherein the update information is information for reserving a designated slot by specific ID information not including model information. 7. The update information is stored in two adjacent slots.
4. The process control device according to claim 3, wherein one IO module is used as information indicating that it is a duplicated pair. 8. The transmission control module checks the management information collected and held based on the duplicated pair information, and when the ID information of the pair does not match, notifies the control arithmetic unit of that fact. The process control device according to claim 7, wherein the process control device is a process control device. 9. The transmission control module checks the management information collected and held in order to perform redundant control of the operation / standby of the IO module based on the redundant pair information, and both IO modules of the redundant pair operate. ,
8. The process control apparatus according to claim 7, wherein both of them enable detection of an abnormal state that is in a standby state, and when the abnormal state is detected, predetermined information is notified to the control arithmetic unit. 10. The IO based on the duplexed pair information.
In order to perform redundant control of module operation / standby, when it is detected that only one of the pairs is installed in the transmission control module when the power is turned on, the other one is notified to the control arithmetic unit as a failure. The process control device according to claim 7, wherein: