JPS58197505A - Complex process controller - Google Patents

Abstract

PURPOSE:To obtain the simultaneity of fetched control information between control loops by transmitting information from respective control loops with allotted time slots at a time, and storing control information from other loops and updating the storage contents of the respective loops at the same time. CONSTITUTION:Time slot markers generated by a time slot marker generating module 1 are sent out to a communication bus 4 with a specific period at specific intervals. Each process control function module 2 receives and decodes the time slot markers to perform sampling control synchronously with the marker signal, and communication is permitted, for example, in such a way that a time slot #n is to a module #n; and control information that only modules #n of modules 2 hold is transmitted to other modules 2 at the same time during the period of this time slot #n, and other modules 2 receive it and update their storage contents.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a process control device that controls a process by sampling control, and particularly relates to a process control device that controls a process using sampling control, and particularly relates to a process control device that controls a process using a complex type process that is equipped with a communication function suitable for processing a plurality of mutually related control variables. Regarding a control device.

There are many industrial processes that have multiple control variables that are interrelated to achieve a goal. Multiple control rules are needed to control this process! Each control loop has its own control loop/of! When performing process control processing, - control information of other control loops must be taken in as a reference, that is, input information, and control processing must be performed. Therefore, it is necessary to transmit control information between each control route 1.

Conventionally, such control information has been transmitted between control loops using individual wiring such as Pv lines and SP lines between each control loop, or multi-routing! In systems such as type controllers where multiple control loops share a single memory, this is done through shared memory. In addition, in the case of a system in which multiple controllers are connected via a communication line, the control information is transmitted through this communication line, but in this case, if the controller is kept, it is possible to use the A communication method such as N-to-N communication is used. However, with such a communication method, the number of communications increases significantly, and it takes time to collect the necessary control information from other control loops. Furthermore, it is difficult to maintain the periodicity of control calculations required for sampling control due to the time required for retransmission when a transmission error occurs. In order to eliminate these drawbacks, communication in a short time compared to the period of sampling control, in other words, very high-speed communication is required, but it will be expensive.

The present invention was developed in view of this background, and uses a communication path in a time-division manner using a fixed-period time slot method, and each control loop side uses a broadcast transmission method in its assigned time slot. Sends own control information to other control roof # side. Each control loop side has its own control information and each other control loop! The above-mentioned information sent from the side is stored, and control processing is performed using the stored control information. The stored information' is updated in each loop while maintaining simultaneity, and the periodicity of the sampling control calculation is not disturbed by the input information.

Hereinafter, the present invention will be explained in detail using the drawings.

FIG. 1 is a diagram showing the configuration of an embodiment of the multi-platform process control device of the present invention. In the figure, 1 is a time slot marker generation mower, 2 (5) is a process control The process control function module 3, which has the processing ability of the control loop that is the basic unit and performs its processing using the sampling control method, is the communication module for communicating between this device and other external devices. , 4 is an internal communication path, and the time slot marker generation module, process control function module, and communication module are connected through this communication path. Further, each process control function module is connected to the process 5 via a process signal processing device (not shown).

In this control device, a time slot marker generation module generates a time slot marker having a format as shown in FIG. 4 will be sent out.

These series of time slot markers are constructed as shown in FIG. Each process mmm
Function module 2 receives and decodes the time slot marker 1, performs sampling control operations in synchronization with this marker signal, and allocates (6) the control information (transmission format) according to the assigned slot number. It performs the transmission of b) in FIG. 2 as well as communication with the outside, for example, a man-machine interface, a host computer, and a host computer (the transmission format is @ in FIG. 2).

FIG. 4 is a functional diagram showing the functions of the process control function module 20. In FIG. Receives and processes marker signals as well as control information from other process control function modules. dB is an other module control information holding buffer that stores control information from other process control function modules, and the storage area is divided and prepared for each other process control function module or module. US is a status register, which indicates the update status of the received data in the dB, that is, whether or not it is updated as specified, and
Other process control function modules related to own control processing,
- This is a book that shows the operating status of the system.

DB stores the control information of the self-process control function module; PS is the synchronization signal based on the time slot and marker signal of the path communication processing unit PCR; This is a timing control section that generates a tie-setting signal for sampling control based on the timing control section.

The storage portions 1 and 2 are storage portions that store a control algorithm during normal operation and a control algorithm that replaces the control algorithm during abnormal operation when an abnormality occurs. PP is the above-mentioned B, U8. This is a gross control processing unit that controls and manages the f processes connected to itself based on information and control from the DB, PS, and AN processor. The PCT is a communication processing unit that processes other processes in a predetermined tie/da assigned to its own module based on a synchronization signal based on the time slot marker signal from the PCB. This is for simultaneously transmitting local control information to the control function module. Furthermore, PT is a local sampling timer, and the sampling time control section PS receives a synchronization signal from the path communication processing section PCB. If an abnormal condition occurs, the timing signal for sampling control is provided and a predetermined abnormality process is started.

Next, we will discuss the relationship between communication of control information and control processing between each process control function module of the apparatus shown in FIG.
This will be explained using the drawings and FIG. 6.

Figure 5 shows each process control function's own property, -
Only the parts of the control information holding section for the control information of the sled and other objects are extracted and shown for the purpose of explaining the operation of updating the contents of the buffer all at once. This is carried out using the simultaneous transmission method as shown below.

The time slots within one period in Fig. 3 are control information transmission frames (number of slots N≧number of control function modules in the device For example, time slot number L is assigned to modi, -ru no t, time slot φ grave is assigned to moji, -ru φz, and communication is allowed. During the period t, Nat's module (9) 1-2 is the only self-mozo, - rule control information holding pa, 7a DB
The control information held in the module is allowed to be transmitted all at once to the other modules 2, and the other modules 2 receive this control information and divide it into the control information holding buffer dl. The storage area dE1+A for storing information from the transmitting module L that is currently being updated is updated all at once.

Next, in the period of time slot number n, modi, - rule 2
Only φn is allowed to transmit, and all other modules are in the receiving state.

As a result, the storage areas dBφn provided in the buffers 11 of all the modules except the module 2 and the module 2 are updated at the same time. In this way, by using time-division multiplex communication with a fixed period using the time slot format, the contents of the control information holding buffer can be updated at one time by one simultaneous transmission for periodic updates, and the control information at the same time can be transmitted simultaneously. Each will be updated and prepared. The iris diagram exemplifies these situations in terms of the relationship between the processing operations of the multiple metal process control 41 device and the flow of information. moc)
1-Rule (10) samples the process information, performs processing corresponding to the process, and performs processing such as holding it in its own module control information holding pa and file DB. Arithmetic processing for process control is performed using only process information, and at the assigned time slot number t, other modules are calculated as follows: -r ÷m.

In the example of sending data all at once to Nan, Suφ, etc., 夛, MOJ, -Luna n is mono, -ru◆Uses the control information that has been pre-computed in L as part of its own control information. For example, in time slot number n, a message is sent to other modules all at once.

Note that, as described above, the module φt does not require control information from other modules. That is, this is an example in which it is not necessary to receive control information from other modules. Module φm
is an example in which information from other mods, -Lunat, ◆n is used as part of its own control information. In this way, each process control function module 2 stores its own control algorithm by referring to the data in the control information holding buffer (on, am), etc. Control stored in part C! Control process 5 according to Rodaram. Note that when an abnormality occurs, for example, when the status register U8 outputs a defective new boat status, the control algorithm (at the time of abnormality) is switched to perform a predetermined control process. See you again, San! Ring time control section PS
If a failure occurs such as not being able to obtain a synchronization signal from the path communication processing unit PCB, the local sampling timer P
The timing of the process control processing unit is determined by the timing signal from T, and the required processing is performed.

Figure 17 shows the process control function module 2 in the present invention.
In one embodiment, 2 ports) DEAL! using RAM! In Figure 0, which shows a block configuration consisting of processors, 11 is a processor for process control processing (PP in Figure 4), and 12 is a processor.

FROM which stores the control algorithms (AA, AN) used by 11, and RAM (PP) for rounding work 20 and rear for temporary storage of calculation results, 13
is a timer (P8/PT) for sampling control.
), 14 is an input/output section for the input/output signal, and 15 is a multi-port RAM that holds the local control information.
B), Other module control information retention/Dotsufa (in),
Used for update status (tys). 16 is for no-kiss communication processing! The first step is the path communication processing used by the processor 16! FROM where the program is stored and RAM for the work area (
P.C.B.

PCT), 18 is a timer (PCR, PCT) that generates a time signal necessary for path communication processing, and 19 is an internal path 21 (4 in Figure 1) to which the process control function module is connected.
It is an internal path interface for connection with Zorose and Thanos 20. Broadly divided, the above 11 to 14ti constitute an algorithm section 1, and the above 16 to 19 constitute a path communication section (2). The operation is the same as described above, and the path communication section ■ prepares and writes the update status status and other information on other items to the RAM 15, and the algorithm section ■ can use it at any timing independent of the path communication section. . Self-moji.

Control information is also prepared in the RAM 5, referenced by the algorithm section (2), read out by the path communication section I, and transmitted simultaneously to other control function modules in the assigned time slots. Said path communication processing gloss, S16 and FR
OM and RAM 17 are for regular transmission.

Performs regular reception processing and supplies the M signal to the algorithm section.

As is clear from the above description, according to the present invention, the process control function modules are composed of basic units required for process control, and the means for transmitting control information between them is used for all modules. Since it is composed of one communication system common to all modules, it is necessary to connect Zoroses signals to each module and change the connection for transmitting control information between each module, in other words, the actual wiring. By increasing or decreasing the number of process control function modules according to process needs without changing the process, and by changing their control combinations, complex control functions from very small to large scale can be effectively realized. Kameru0
% This % image is a control loop that is subject to pressure control such as off-site or patch processing! This is a very big advantage for a narant whose configuration is the same, but which is dynamically changed by the driving shadow.

In addition, since the configuration maintains the independence of each control function module, it is easy to handle the necessary abnormalities, making maintenance easy and minimizing the impact on the entire f process. can.

Furthermore, the present invention efficiently guarantees the simultaneity of control information, which is very important when performing sampling process control in multiple interconnected control loops, by simultaneous transmission within a limited transmission space. Ruhata San! The periodicity of the ring control calculation is completely satisfied. By using the time slot method, it is possible to specify the time series of processing and to perform processing that is independent of the control function mode. In addition to the synchronization method (forced synchronization method) explained so far, each time slot and time slot marker can also be set using the same XQ for the mask time slot marker that occurs once per period in Figure 3 (in each control function mode). It may also be based on a so-called dependent synchronization method in which synchronization occurs uniformly.

[Brief explanation of drawings]

FIG. 1 is an overall configuration diagram showing an embodiment of a composite GFA access system according to the present invention, FIG. 2 is an example of a transmission format, and FIG. 3 is a configuration diagram of time slots in one cycle. , @Figure 4 is the control machine in Figure 1) 1-
Functional pro to show the functionality of the file. Figure 5 shows the control t'# between control function modules.
FIG. 6, which is a diagram for explaining simultaneous update of information, shows an example of processing and information flow. FIG. 7 shows the combined gross control function module in the process control device of the present invention.
This is an example in which the file is constructed from Grosse, Su, etc. l...Time slot marker generation module, -l, 2.
...! Process control function module, 4.21... Internal path, 11, 16... Grosse, 12.17...
FROM and R pigeon, 13.18...timer, 15
...RAM. Patent Applicant: Yamatake No. Newel Co., Ltd. Representative: Hiroharu Matsushita Figure 1 Figure 3 Figure 4 Human output -32=

Claims (1)

[Claims] (1) Time slots used to synchronize time division multiplex communication and control processing sequences in the process control algorithm unit! - a time slot marker generation module that generates a car signal; a group of process control function modules that individually have the processing capacity of a basic unit of process control (for example, one control loop f) and perform sampling control; The time slot marker generation module, - and the process control function module, - group are connected, and an internal communication path is provided for communication between the function module, - group by time division multiplex communication using a time slot management method. and further the individual process control function module, -
The module stores predetermined control information sent at regular intervals from other process control function modules at predetermined timings for use during its own process control processing. A status ratio p indicating the update status of the other module control information holding buffer and the operating status of the other control function module; The information in the corresponding area of the buffer and the status register indicating the update status are updated using the control information sent from the other control function modules at regular intervals, and the time slot A path communication processing unit that generates a synchronization signal such as a marker signal, a buffer that holds control information of its own control function module, and ・ Each other control function at the predetermined timing. A path communication processing unit for periodic transmission that simultaneously transmits its own control information to modules, and a /? for periodic update. San! for sampling control based on the synchronization signal from the communication processing section. A sampling time control section that generates a ring time signal; ■ A storage section in which control alkaline rhythm is stored; ■ Connected to itself based on the information from each section of ■, @, @, θ, and ■. It consists of a process control processing unit that controls and manages the operating end, and transmits control information between each process control function module and module.
A composite Zorothes control device characterized by logically separating each process control process.