JPS6146844B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a batch data setting method in a batch process control device using a computer.

In the batch process, it is necessary to reset various setting values and control parameters (batch data) of the control device in accordance with changes in product brands. There can be multiple pieces of batch data per loop of the control device, and these batch data groups are determined for each loop depending on the brand, so as the number of control loops increases and the types of brands increase, batch data Configuring the settings manually is very time-consuming.

When a batch process control device is configured by a combination of analog controllers, the only practical option is to set the batch data manually, but when configured using a computer, , automation of batch data settings can be expected. In that case, batch control is performed according to a predetermined sequence, so for setting batch data,
Appropriate management that coordinates with sequence progress is required.

SUMMARY OF THE INVENTION An object of the present invention is to provide a method that allows batch data to be set in coordination with the transition of a batch control sequence using a simple procedure.

The present invention arranges batch data together with setting control words in a list format for each brand, and sets the batch data to a control loop according to the setting control words in the list. can be rewritten by an operator operating device, a sequence control device, and a host computer.

The present invention will be explained below with reference to the drawings. FIG. 1 is a conceptual configuration diagram of a process control device to which the present invention is applied. In FIG. 1, 1 is a calculation control device, 2 is an operator operating device, and 3 is a process to be controlled. The calculation control device 1 consists of a computer and various interfaces, and sends and receives signals to and from the process 3 to be controlled through the instrumentation wiring 4. The operator operating device 2 is connected to the computer by a data transmission line wired under the floor, and communication between the operator and the computer can be performed through a color CRT 21 and keyboards 22 and 23.

Computation control device 1 follows the DDC program
Performs DDC (direct digital control). The DDC program has a database structure. For this reason, various data used in the program are collectively collected in a list. The form of the list is determined according to the convenience of work processing. Here, the format of the list is determined by DDC for each unit function. Each unit function of the DDC is associated with each component in the analog control system. Unit functions include, for example, a PID controller for batch control, an on-off controller, a manual operation device, an indicator, a signal selector, a first-order lag unit (filter), a lead-lag unit, a dead time unit, a polyline function unit, etc. be. Hereinafter, these will be referred to as internal instruments.

Figure 2 shows a list of PID controllers among the unit functions. In FIG. 2, L1 is an analog input list, L2 is a PID control list, L3 is a calculation list, and L4 is a constant list. Analog input list L1 is a master list, and other lists L2, L3, and L4 are subordinate to it. Calculation list L3 and constant list L4 are added as necessary. Such a list is prepared for each PID controller loop. Details of the analog input list L1 are shown in FIG. FIG. 3 shows only those listed items necessary for explaining the present invention, and the others are omitted. The meaning of each item in Figure 3 is as follows.

Function No.…Representative display of unit function Control list…Control list L2
Calculation list...Specifies the calculation list L3 Input processing specification...Specifies the type of input signal linearization operation Input processing detail number...Specifies the linearization operation program or constant list L4 Status...Input status Displays PV _o-1 ...Measured value (input value) PH...Upper limit setting value of the measured value PL...Lower limit setting value of the measured value PV _o ′ _-1 ...Measured value for calculating rate of change VL...Tolerance value for rate of change of measured value PID Details of the control list L2 are shown in FIG. FIG. 4 shows only those items necessary for explaining the present invention among the listed items, and the others are omitted. The meaning of each item in Figure 4 is as follows.

Function No....Detailed display of unit function SV...Setting value Vn...Compensation signal (for compensation of input or output) MV...Manipulated amount (output value) MH...Upper limit setting value of working amount ML...Lower limit setting value of operating amount Kp...Proportionality constant I...Integral constant D...Differential constant DV...Difference DL...Deviation limit value M' _o-1 ...Previous measured value E _o-1 ...Previous deviation △M _o-1 ...Previous measured value change The DDC program obtains data from these lists and performs unit functions according to each loop. Similar lists are provided for other internal instruments.

The calculation control device 1 also performs sequence control using a DDC program. In Figure 5,
01 is a sequence control device. This sequence control device 01 actually consists of a computer and its peripheral devices, but here it is expressed functionally. In the sequence control device 01, 11 is a sequence table provided in the main memory, in which various information regarding sequence control is written, and the computer uses the information in this table to perform sequence control. do. The sequence table 1 is divided into four parts: top, bottom, left and right, with an operation start signal written in the upper left column and an operation signal written in the lower left column. The operation start signal is an input signal that becomes a sequence transition condition, and the operation signal is an output signal given to a controlled object. The sequence operation start condition is written in the upper right column, and the operation command is written in the lower right column. The operation start condition and the operation command are paired with those belonging to the same column, and when the input signal given from the controlled object matches the operation start condition, the operation signal specified by the paired operation command is It is designed to be output to the controlled object. Such operations are performed by a computer program. The next transition destination in the sequence can be specified by a step counter 12. The step counter 12 is controlled by the operation start conditions and information read from the sequence table 11 at any time. However, this step. The counter 12 is conceptual and is actually realized by a computer program. 13, 13' are internal switches, 14 is an internal preset counter, 15 is an internal timer, 1
6 is a clock pulse generator. These generate input signals that are checked against the operation start conditions of the sequence table 11, and are provided in the necessary number and assigned identification numbers.

2 is an operator operating device, 03 is a message printing device, 4 is a contact input device, 5 is a pulse input device, 6 is a contact output device, 7 is an analog input device,
8 is an analog output device, and 9 is a feedback control device. In the feedback control device 9, 91 is a control unit, 92 is a switch unit, and 93, 93' are manual operation units.
Each of these units is realized by the unit function of the DDC program as described above. The message printing device 03 is operated by the output signal of the sequence table 11 and prints a predetermined message. The contact input device 4 inputs a contact signal according to the state of the controlled object into the sequence table 11. The pulse input device 5 inputs a pulse signal according to the state of the controlled object to the internal preset counter 1.
Enter 3. The contact output device 6 outputs a contact signal corresponding to the operation signal given from the sequence table 11 to the controlled object. The analog input device 7 inputs an analog signal corresponding to the state of the process to the feedback control device 9, and the analog output device 8 operates the process in response to the analog output signal given from the feedback control device 9. Control unit 9 of feedback control device 9
1 supplies an alarm signal or the like to the sequence table 11 as an input signal. Sequence table 11
An operation signal is given to the switch unit 92 from the switch unit 92 to switch the manual operating devices 93, 93'. The feedback control device 9 is controlled by the sequence control device and performs batch control and the like. A necessary number of contact input devices 4, pulse input devices 5, contact output devices 6, analog input devices 7, analog output devices 8, and feedback control devices 9 are provided, and each is given an identification number.

Types of signals constituting the operation start signal and the operation signal are shown in Table 1 and Table 2, respectively. In Table 1, "contact input",
The terms "internal switch", "internal timer", "internal preset counter", and "feedback control loop" respectively refer to the contact input device 4, internal switches 13, 13', internal timer 15, and internal preset counter 14, and
This is a binary signal generated by the feedback control device 9. Also, "sequence table number" is
This is a binary signal that is generated as a result of a computer performing an operation based on a different sequence table, and is used in cases where a sequence table that is commonly used in several processes is provided, or in the case of complex sequence control.
This is used when the control operation is divided into several blocks and each block is written in a separate sequence table, and when such a sequence table is to be referenced. In Table 2, "Holding type contact output", "Holding type internal switch output", "Internal timer start", "Internal preset counter
"Start", "Feedback control loop", and "Message output" respectively refer to the contact output device 6, internal switch 13', internal timer 15, internal preset counter 14, feedback control device 9, and , is an output signal given to the message printing device 03. Note that the contact output device 6 and the internal switch 13' have an instantaneous type in addition to the holding type due to their roles, so the output signals for them are "instantaneous contact output" and "instantaneous internal switch output", respectively. provided. However, a holding type is a type that maintains the same state once it is operated until the next reverse operation is performed, and an instantaneous type is a type that maintains that state only as long as the operation signal continues. belongs to. Furthermore, the "sequence table number" is an output signal given to the computer (program) so that it can refer to and perform control compiled in another sequence table.

The calculation control device 1 further has a batch data setter as a unit function of the DDC program, and the list as a database has a structure as shown in FIG. The list in FIG. 6 has a similar structure to the list for the PID controller in FIG. 2 in terms of form. That is, there is a master list L1', to which a control list L2' and a calculation list L3' are vertically attached.

From address 2 to address 15 of master list L1'
The 14-word area is an area for storing batch data setting destination addresses, and addresses each indicating the setting destination of 14 batch data are stored. The batch data is set to an internal instrument such as a PID controller or a sequence control device, and signals as shown in FIGS. 7a and 7b are used as address signals, respectively. In FIG. 7, a is for internal instruments, and b specifies a list of desired internal instruments and desired data in the list, respectively, by loop number and relative address within the loop, and b is for sequence control. This is for the device and specifies the type and number of the operation start signal and operation signal as described above. Note that address 0 indicates invalid setting.

Batch data to be set is stored in the control list L2' and the calculation list L3'. Among these, control list L
2' stores the data of the current batch, and calculation list L3' stores the data of the next batch. This allows batch data for two brands to be collected in one batch data setter. Note that when it is sufficient to collect data for one brand, the calculation list is omitted. In both lists, an area of 14 words excluding the first two words is defined as a batch data area. Each piece of data in this area corresponds to each address signal in the master list in the same order, forming a pair of setting destination and setting content.

The setting control word SV is stored in the second word of the control list L2'. The setting control word determines the operation of the batch data setter according to its contents, and its code and operation contents are as follows.

0...No batch data this time, 1...Batch data available this time, batch standby 2...Batch data set this time to the internal instrument or sequence control device 3...Batch data available this time, batch operation The setting control word SV is set by the operator. It is rewritten by the operating device, sequence control device, host computer, and batch data setter itself. This time, the batch data is from the operator operating device, host computer,
Or given from calculation list L3'.

The next data status word NV is stored in the second word of the calculation list L3'. This status word will be used next time.
This indicates the presence or absence of data; 0...Next batch data not available 1...Next batch data available. This status word NV is rewritten by the batch data setter according to the status of the next batch data area. The next batch data is given from the operator operating device or the host computer.

Batch data setting operations for internal instruments and sequence control devices are performed as follows. Operation explanatory diagrams are shown in FIGS. 8, 9, and 10. FIG. 8 shows the case of one batch, FIG. 9 shows the case of two batches, and FIG. 10 shows the case of multiple batches.

In FIG. 8, BD is a batch data setting device, and M1 to M14 are internal instruments and sequence control devices that receive batch data settings. The batch data setter BD operates according to the contents of the setting control word SV. The setting control word SV is 0 when there is no batch data in the control list L2', but is set to 1 when batch data is written from the operator operating device or host computer. The batch data setter BD does not set batch data for internal instruments etc. when the setting control word SV is 0 or 1. This state is conceptually represented by turning off the switch SW.

When the setting control word SV is 1, if a batch start command is given from the operator operating device or sequence control device, the setting control word SV becomes 2.
Accordingly, the batch data setter BD
Turns on the conceptual switch SW, sets each batch data to the internal instruments M1 to M14 specified by each setting destination address, and sets the setting control word SV to 3 when the setting is completed. and set control word
When the SV reaches 3, batch process control based on the set batch data is started.

In the case of 2 batches in FIG. 9, the current batch data and next batch data are written to the control list L2' and the calculation list L3' from the operator operation device or the higher-level calculation, respectively, and SV=1, NV=1. Then, when a batch start command is given, the current data of the control list L2' is set in the internal instruments M1 to M14 in the same manner as in the above case, and one batch process control is performed. When this batch is completed, SV is set to 0, and there is no batch data this time. Then, the batch data setter
According to the state of SV = 0, NV = 1, BD turns on switch SW', transfers the next batch data of calculation list L3' to control list L2', and writes a new batch data. This time we will use batch data. Due to this, SV=1,
When NV=0 and a batch start command is given again in this state, the internal instruments etc.
Batch data is set to M14, and process control of the second batch is performed.

In the case of multiple batches in Fig. 10, as shown in Fig. 10a, batch data setters BD1 to BDn for one batch are provided for each batch, and these are switched and used by the sequence control device SEQ for scheduling. Or, as shown in Figure b, the batch data setting device BD for 1 batch or 2 batches is set to the host computer.
Batch data is sequentially transferred from file F of CP for operation. In case b, when a batch data setter for two batches is used, the buffering effect of having two batch data storage areas can be effectively utilized for data transfer with the host computer.

As described above, the present invention arranges batch data together with setting control words in a list format for each brand, and sets the batch data to the control loop according to the setting control words in the list. This setting control word can be rewritten by an operator operating device, a sequence control device, and a host computer. Therefore, by a simple procedure using a computer, batch data can be set in coordination with the transition of the batch control sequence.

[Brief explanation of the drawing]

FIG. 1 is a conceptual block diagram of a process control device to which the present invention is applied; FIGS. 2, 3, and 4 are explanatory diagrams of a data list of a PID controller;
FIG. 5 is a conceptual configuration diagram of the sequence control device;
FIG. 6 is an explanatory diagram of the data list of the batch data setter, FIG. 7 is an example of the data structure in the data list of FIG. 6, FIGS.
FIG. 0 is an explanatory diagram of the operation of the embodiment of the present invention. 1... Computation control device, 2... Operator operating device, 3... Process, L1 to L4... List, 0
1...Sequence control device, 11...Sequence table, BD...Batch data setter,
M1 to M14...Internal instruments.

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Claims (1)

[Scope of Claims] 1. Various process control functions including PID control functions, sequence control functions, etc. realized by programs in a batch process control device using a computer that can be connected to a host computer and an operator operating device. A method for setting batch data in a database, the method includes: a first list storing information indicating the setting destination of each batch data in a second list to be described later; and this first list as a master list. It stores a batch data group related to the control of one batch that is subordinate to it and is given from a higher-level computer or operator control device, and indicates the first value when the batch data group is not written and is operated by a higher-level computer or operator. a second setting control word that stores a setting control word that is rewritten to a second value when batch data is written from the device and rewritten to a third value when a batch start command is given from the operator operating device or the sequence control function; A database is provided for the batch data setting function consisting of a list of A batch data setting method of setting in a database for various process control functions according to the setting destination information of the setting control word and rewriting the same setting control word with a fourth value. 2 Batch data is stored in a database of various process control functions, including PID control functions, sequence control functions, etc. realized by programs, in batch process control equipment using a computer that can be connected to a host computer and an operator control device. This method includes a first list that stores information indicating the setting destination of each batch data in a second list, which will be described later, and a host computer that uses this first list as a master list and subordinates it to the master list. Or it stores a batch data group related to the control of one batch given from the operator operating device, and when the batch data group is not written, it shows the first value and the batch data is transferred from the host computer or operator operating device. is rewritten to the second value, and the third value is rewritten when a batch start command is given from the operator operating device or sequence control function.
a second list that stores setting control words that are rewritten to the values of the first batch control word and rewritten to the first values when one batch control is completed; or stores a group of batch data related to control of other batches given from an operator operating device, and
When the batch data group is not written, the first value is displayed, and when batch data is written from the host computer or operator operation device, the second value is displayed.
The third one stores the setting control word that is rewritten to the value of
A database for the batch data setting function is provided, and when the setting control word of the second list of this database indicates the third value, the batch data of the second list is The setting control word is set in the database for various process control functions according to the setting destination information in the list, and the setting control word is rewritten to the fourth value, so that the setting control word in the second list of the database indicates the first value. The setting control word in the third list is the second
, the batch data of the third list is written to the second list, the setting control word of the second list is written to the second value, and the setting control word of the third list is written to the first list. How to set batch data to rewrite the value.