JPS603748A - Collating method of memory for controller - Google Patents

Abstract

PURPOSE:To prevent knowhow from leaking out by limiting persons who can read out information stored in a read-only memory of a controller. CONSTITUTION:A program creator operates respective keyboards 12 and 25 of a program loader and a process controller to write a created program and a collation password in an ROM10. In case that the ROM10 is provided in the process controller, the collation password is stored in a collation code area of an RAM 24 by the command of a CPU21 when an operator designates a collation password on the keyboard 25. Next, when the keyboard 25 is operated to reguest the read of the ROM10, the CPU21 reads out the collation password stored in the ROM10 and stores it in the RAM24. The CPU21 compares the designated collation password and the collation password in the ROM10 with each other; and only when they coincide with each other, the program in the ROM10 is read out and is stored in the RAM24 and is displayed on a display device 26. If both passwords do not coincide, the program in the ROM10 is not read out.

Description

[Detailed description of the invention]

[Technology of the Invention] The present invention relates to a process controller, and particularly to a method for checking a memory for a controller that stores parameters for each process. [Technical background of the invention and its problems] Conventional process control has been performed by combining various hardware, but in recent years, process controllers have been developed that use the same hardware as before and perform control calculations by program. started to be used. When using such a process controller to control the flow rate, for example, the analog signal from the flow rate detector is proportional to the flow rate or proportional to the square of the flow rate. Therefore, the process controller has a power that determines how many liters of flow meter the input analog signal corresponds to, that is, the parameters of the control calculation program. Therefore, such parameter information is stored in a replaceable μ read-only memory (hereinafter referred to as RO) for the process controller.
M) is programmed and stored. As parameter information has been converted into a program, the center of program creation has shifted from instrumentation manufacturers to engineering companies. Therefore, if the program is simply stored in the ROM, if the ROM is provided in the process controller, there is a risk that the know-how of the stored program will be leaked to a person other than the program creator and his/her related parties. Therefore, there is a need to prevent this know-how from leaking. [Object of the Invention] The present invention has been made based on the above-mentioned circumstances, and its purpose is to limit the number of people who can read the information stored in the read-only memory of the controller, and to prevent the leakage of know-how. An object of the present invention is to provide a method for checking memory for a controller. [Summary of the Invention] The present invention uses a program loader device to store parameter information of a process control calculation program of a controller in a read-only memory, and performs a check specified only for the program creator and his/her related parties. A method for verifying a memory for a controller, in which a password is stored and the memory is provided in the controller and the program loader device and its contents are read, and the readout is performed when an operator instructs a verification password that matches the verification password. . [Embodiments of the Invention] The following is a first explanation of the configuration of an apparatus to which the method of the present invention is applied.
Figures (a), (b) and Figure 2 (a), (b)
Explain with reference to. FIG. 1(a) is an external view of the program loader device, and FIG. 2(,) is a configuration diagram of the program loader device. Before this program loader device,
Read-only memory for process controller (hereinafter referred to as R)
6) A control calculation program for each program created by the program creator in J It stores the verification password. Furthermore, this program loader device is equipped with an RO in which parameter information is already stored.
It has the function of reading out the contents of M/(7 and displaying it on the display 11.In addition, in the first etc. are printed on the program.Therefore, this program loader device has the program RO
MJ, 9F operates in response to commands from the performance section (hereinafter referred to as CPU) 14 based on a pre-stored program loader function program, and internal bus B
19 via program ROMJ, 9. Keyboard/Tatsuden interface (hereinafter abbreviated as interface) xs
, d read/write memory (hereinafter referred to as RAM) 7g, and a ROM input/output interface 17 are connected to it. The program loader function program includes a program that reads the contents of the ROM IO when the verification password requested by the operator matches the inquiry password stored in the ROMZO. The interface 15 encodes the verification password and parameter information program, etc. instructed by the operator by operating the keyboard 12, and transmits it to the internal bus B1 according to a command from the CPUJ4, and also encodes the information transmitted through the internal bus B1).
- Sends μ to the display 11. RAM16 is connected to CPIJI4 by pressing keyboard 1 with the finger ◆.
The parameter information set by the operation in step 2 is stored in a predetermined area, and the verification password is stored in a predetermined verification code area.
The data is stored in a predetermined area when the finger number t>4 is pressed. Further, the ROM input/output interface 17 is ROtJ
When LZO is installed in the program loader device, CP
By the command of UJ4, the information stored in -tlRAMJ6 is written to 86M10.

[This is to read the information stored between R6. On the other hand, the process controller shown in FIG.
Line 7I is executed based on the parameter information stored in M10. In addition, W, 1 In Fig. +(b), S is a switch for setting process set values, target values, etc. Here, as shown in FIG. 2(b), the process controller operates the rcP based on the control program and display setting program stored in the program ROMJO in advance.
It is configured to operate according to instructions from U21, and this CPU,
? A program RδM 20, a keyboard/display interface (hereinafter abbreviated as the interface) 22, and a process input/output interface 23 are connected to J via the internal bus B2.
and RAM 24 are connected. Similarly to the program loader device, the program ROM 20i stores a program for reading out the contents of the ROM 10 when the verification password requested by the operator matches the verification password stored in the ROM 10. Here, the ROM 10 is configured to be connected to this internal bus B2. Interface 22 Similar to the interface 15 in the program loader device, the CPU
The command number 2J (therefore, the operator operates the keyboard 25 to transmit the information to the internal bus B2 of the information tube and the information transmitted through the internal bus B2) is sent to the display 26. Process input/output interface 23
The analog signal from the detector 27 is taken in and digitized by the finger ◆ of the CPU 2J, and the CPU 21
The RAM 24, which is 50), outputs the control signal of the control calculation result to the C operation valve 28 as an analog signal.
Process data taken into the process input/output interface 23 by commands from the PU 21, keyboard 25σ)
The information set by the operation and the contents of ROMzO when R6MIO is connected are stored in the specified area.
It is. Next, a memory collation method applied to the Progera spring loader apparatus and process controller configured as described above will be described. First, assume that a program creator at an engineering company or the like creates a program for parameter information of a control calculation program. Therefore, the program creator and his/her related operator write the program into fROMlo using a program loader device. That is, this program is stored in a predetermined area of RAM Lo on the internal bus B14 in response to a command from the CPU 14 by an operator operating the keyboard. Along with this, the operator also stores in the verification code area of the RAF 116 the 11-password, which is known only to the program creator and his/her related persons. Then, the operator operates the keyboard 25 to
When a storage request is made to δMZ(7, the CPU 14
The program stored in the RAM 261 is written to a predetermined area of the 1tdM10 via the input/output interface 17, and the verification password is written to the verification code area of the ROM 7 (J. This completes the writing to the ROMlo. Then, if the program and verification code are already stored in R, OMf (+), do it in the following way. First, send ReMto to the 86M input/output interface 17. Next, the operator inputs its own verification password by operating the keyboard 12 (!-), the verification of ζ,
be done. Furthermore, the operator uses the keyboard 25 to issue a read request for ROM 1o O) to FjLz line 4 (CPU
jilt stored in 86M 10 by command of 14
The O password is read out and stored in the RAM 261 via the ROM input/output interface 17. Here CP
U14 compares the verification password specified on the keyboard 12 with the password of R'6M10, and only when the two passwords match, reads out the contents of RUfAto and stores it in RAMJ6-\. However, R, A
ROM 10 stored in the process controller is displayed on the display 11 by the operator operating the keyboard 12. Next, we will explain the case where this ROkAIo is installed in the process controller. When the operator instructs the verification password using the keyboard 25, this verification password is sent to the CPU.
The code is stored in the collation code area of RAM 2 according to the command from 2J.Next, when the operator operates the keyboard 25 to request to read the ROM 10, the CPU 21
Read the verification password stored in ROM7゜ and use RA
Store in M24. Here, the CPU 2J compares the verification password specified on the keyboard 25 with the verification password of the ROMJo, and if both passwords match, reads the program of the cloud RO'M1o and stores it in the RAM 2M.
and display the contents of this program a 2'
6 Display this. If the two passwords do not match, reading of R″0Ml0 will not be performed. In this way, according to the present method, the R
When storing a verification password in OMZ (7ζ) and making a read request using the program loader device or process controller, the verification code specified by the operator and the ROM 7
R'15M10 if it matches the verification password of 0
The verification password stored in ROMZ (7) and the password specified by the operator are read out.
If the numbers do not match, reading from ROM7+7 is not performed. Therefore, only those who know the verification password, that is, the program creator and his/her related persons, can access the ROM.
It is possible to read and display the contents of ROM7 (7). This prevents the contents of ROM7 (7), that is, the know-how of Blockram, from leaking to the outside. Also, ROM7
(This does not impair the work of storing the program in J and checking the contents of ROMZ (+.) Furthermore, by storing the verification password in ROM10, the Rδ old
If a different ROM is connected to the process controller, the verification password requested by the operator using the keyboard 25 and the verification password of the ROM will not match, and the ROM will not be read. Therefore, there is no possibility that the process controller will connect R6 for a different purpose and perform process control. [Effects of the Invention] According to the present invention, a verification password is stored in the read-only memory of the controller, and when the verification password matches the verification password instructed by the operator in the program loader device and the process controller, the verification password is stored in the read-only memory. Since the contents are displayed, it is possible to limit the number of people who can read the information stored in the read-only memory, and to provide a method for checking the controller memory to prevent leakage of know-how.

[Brief explanation of the drawing]

Figure 1 (,) is an external view of the program loader device ξ.
Figure (b) is an external view of the process controller, Figure 2 (a)
) is a block diagram of the program loader device, and FIG. 2(b) is a block diagram of the process controller. IO...Memory for explanation only for controller, 11...
Display unit, 12... Keyboard, 13... Program ROM, 14... Arithmetic unit, 15... Keyboard/
Display interface, 16...read/thin memory,
17...ROM input/output interface, 2o...
Program ROM, 2Z...1llJE section, 22...
・Keyboard/display interface, 23... Process input/output interface, 24... Read/precious memory, 25... Keyboard, 26... Display, 2
7...Detector, 28...Operation valve, Bl, B2...
internal bus.

Claims (1)

[Claims] A controller that performs process control based on a process control calculation program, and a program loader device that stores parameter information of the process control calculation program determined for each process in a memory provided in the controller, using the program loader device to store the parameter information of the process control calculation program in the memory. In the case where the parameters are stored and a verification password is stored, and the parameter information stored in this memory is provided in the controller and the program loader device and read out, when an operator instructs a verification password that matches the verification password. A method for verifying a memory for a controller, characterized in that the parameter information is read out.