JPS6280703A - Process control device - Google Patents

Abstract

PURPOSE:To improve the safety of a password number by comparing an inputted password number with a registered password number to set up/change control information including the password number. CONSTITUTION:When an inputted password number is decided as an unregistered number by a registration state deciding means, whether unregistered status is to be acknowledged or not is decided by a registration existence recognizing means, and when the existence of registration is decided, the password number is registered when the password number is suitable. If the password number is unsuitable, the unregistered state is continued. Thereby, the password number can be registered comparatively simply in each controller unit and the reregistration of the password number can be executed. Since the control information including the password number can not be changed until the same password number as the already registered one is inputted in accordance with the registered state, the safety of the password number can be remarkably improved.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention prohibits setting and changing of control calculation parameters used to control, for example, a digital controller, etc.
This invention relates to improvements in process control equipment that limit and improve safety.

[Technical background of the invention and its problems] In a process control device, for example, a digital controller is provided corresponding to the process control target, and these digital controllers are monitored by a central process monitoring device having a CRT display device. Performs process control. Each controller stores in its memory a control calculation program and its parameters (referred to as control information) corresponding to the process control target.

By the way, unless the control information stored in this memory can be changed only by a certain person, various problems will occur. For example, if a process control operator changes a parameter without having the role of changing the parameter, the process control system is disturbed and the plant cannot operate properly and smoothly.

Therefore, conventionally, several setting prohibition means have been introduced based on the idea of prohibiting the setting and modification of control information. Part 1
One is to install a prohibition/permission switch on each controller.
For example, parameters for control calculation can be set or changed only when this switch is set to the permission state.

However, this setting prohibition method allows changes to control calculation parameters, etc. to be made relatively easily unless the prohibition/permission switch is adequately managed, and is therefore very weak compared to methods that compare passwords. It had a lock function, which was a security weakness.

Another method is to determine a password at the same time as determining the control calculation parameters for each controller, and to store the password together with the control calculation parameters in a memory or the like in advance. In this case, the registration of the PIN number, etc. is performed not by the controller itself, but by connecting another device for the purpose of setting control information externally, which enables the registration of the PIN number, etc. Therefore, unlike a switch that can be operated by anyone, this setting prohibition means cannot change the settings of control calculation parameters, etc. unless a password is registered in advance and the password is set by the operator.

However, although this means of prohibiting settings using a PIN number can be applied to a system in which control information is determined by connecting another device externally, it is not possible to register control calculation parameters, PIN numbers, etc. with a single controller. Therefore, it cannot be applied to controllers that operate independently or simple controllers that are commonly used (Japanese Patent Application No. 5
No. 8-246369).

[Purpose of the invention]

The present invention has been made in view of the above-mentioned circumstances, and is a process control device in which it is possible to easily register and change a personal identification number using each controller alone, and in which security can be greatly improved compared to conventional ones. Our goal is to provide the following.

[Summary of the invention]

The present invention makes it possible to input control information and a PIN number by key input, and when a PIN number is input, the registration status determination means determines the registration status of the PIN number, and if the PIN number is not registered, the PIN number is After confirming whether or not to register the PIN, register the PIN, and if there is a PIN IFLr' number, perform unlocking etc. based on the status after PIN registration and compare the input PIN with the existing PIN. This is used to change the settings of control information including the password.

〔Example〕

Hereinafter, one embodiment of the present invention will be described with reference to FIGS. 1 to 5. Figure 1 is a schematic diagram showing the hardware configuration of the device, Figure 2 is an overall operational flowchart explaining the initial setting and setting changes of the PIN and control information, and Figure 3 shows the PIN when the PIN is not registered. Flowchart explaining the operation of the registration presence/absence confirmation means for determining whether or not to register, 4th
FIG. 5 and FIG. 5 are operation flowcharts for determining the state after the password has been registered and changing the settings of control information including the password when the password has already been registered.

First, in FIG. 1, numeral 11 is a central processing unit (hereinafter referred to as CPU) that executes calculations and control operations based on a sequence program.
Bus 12 is derived from bus 11. This bus 12 includes a setting section consisting of an input key 3 (including means for inputting analog signals from other devices) and an operator interface 14 through which the operator inputs control information and a password, as well as an input interface 15 and a setting section. An output interface 16 is connected. The operator interface 14 can display and set necessary data in response to key operations by the operator, and also sends data to the bus 12, such as setting and changing control calculation parameters, and registering passwords. The input interface 15 has a function of taking in and processing process information, for example, and includes an AC-DC conversion function and the like.

The output interface 16 has a function of outputting a control output processed according to a sequence program to a process or necessary external equipment. This includes photocouplers that optically couple and transmit signals.

The bus 12 also includes a ROM (read-only).
A memory) 17 and a RAM (random access memory) 18 are connected. The ROM 17 stores the sequence program for executing control calculations, a program for setting and changing control calculation parameters, a program for registering a security password, and the like. Further, the RAM 18 stores data such as various settable control parameters, a security password, and permission/disapproval to change control information.

Reference numeral 19 denotes a security password memory section.

Next, the operation of the apparatus configured as follows will be explained. First, FIG. 2 is a diagram illustrating the overall operation of setting and changing the bright period of the password and control information,
Upon receiving the start command, it is determined in step S1, which functions as the registration status determining means, whether or not the PIN number has been registered, and if it is not registered, step S1 is performed.
Step 2: [Multiple lines are used to determine whether or not to register the PIN number using the registration confirmation means shown in FIG. That is, step S
If it is unregistered in step S21, the process moves to step S21,
It is determined whether to leave the state unregistered or not, and if it is determined to be registered, it is determined whether the PIN entered by the operator is appropriate as a PIN (522), and if it is not, the state is unregistered. continues, and a message to that effect is displayed (step 523). Also, step S
If it is determined in step 22 that the password is appropriate, the key-input password is set and registered, and at the same time it is locked, and a message to that effect is displayed (step 524). Further, if the state is determined to be unregistered in step S21, the process moves to step S25, where data indicating no registration is set in the memory or the like, and a message to that effect is displayed.

Next, in step S1 shown in FIG. 2, if it is determined that the PIN number is in the registered state, the process moves to step S3, where the state after the PIN number has been registered is checked. If it is in the locked state, a lock display is performed in step S4, and the process proceeds to change the setting of control information including the password (step S5), that is, the setting permission operation shown in FIG. 4.

This setting permission operation is performed by writing the keyed-in password into the RAM 19 as shown in FIG. 4 (step 5).
51) Compare this written PIN with the already registered PIN (step 552), and if they match, step S53-354 releases the locked state, changes the PIN or control information, and permits the same. Show status.

Further, if there is a mismatch in step S52, step S55. As shown in S56, the locked state is continued and the locked state is displayed.

On the other hand, if the state after registering the PIN number changes to the permitted state in step S3, the permitted state is displayed in step S6, and then the process moves to step S7 to perform a setting lock operation for control information including the PIN number, that is, as shown in FIG. Perform the actions shown in . FIG. 5 shows that the key-input password is written into the RAM 19 (step 571), and the written password is compared with the already registered password (step 5).
72), if they match, the permitted state is continued as shown in steps S73 and S74, and the 11'1 permitted state is displayed. On the other hand, if there is no match, step S75. '
376, the locked state is set and the locked state is displayed.

Therefore, according to the configuration of the embodiment as described above, when the registration state determining means determines that the item is not registered, the registration status checking means determines whether or not to set the status to unregistered, and when it is determined that the item is registered. If the PIN is a valid PIN, it will be registered, and if it is incorrect, it will remain unregistered, so each controller can relatively easily set the PIN. In addition to being able to register the PIN, it is also possible to redo the PIN, and depending on the status after PIN registration, unless the same PIN is entered as the PIN that has already been registered, the control information including the PIN can be saved. Since the information cannot be changed, security can be greatly improved. Once a PIN is registered in this way, operations are restricted from then on unless the protest using that PIN is canceled. Furthermore, with the above configuration, for example, when starting up the controller for the first time, it is possible to include a password in the necessary control calculation parameters and register them in the same way as the parameters.

〔Effect of the invention〕

As described in detail above, according to the present invention, control information including a password can be registered by each controller alone.

It is possible to provide a process control device that can be easily modified and has significantly improved safety compared to conventional devices.

[Brief explanation of drawings]

Figures 1 to 5 are shown to explain one embodiment of the process control device according to the present invention. Figure 1 is a schematic diagram showing the hardware configuration of the device, and Figure 2 is a PIN number and control FIG. 3 is an overall operation flowchart explaining the initial setting and modification of information; FIG. FIG. 5 and FIG. 5 are operation flowcharts when the control information is changed by determining the status after the password has been registered when the password has already been registered. 11... CPU, 14... Operator interface, 15... Input interface, 16... Output interface, 17... ROM, 18... R
A.M. 19...Password memory section. Applicant's agent Patent attorney Takehiko Suzue Figure 1 Figure 3 Figure 4

Claims (3)

[Claims] (1) A setting section for setting and inputting control information and a PIN number, a memory for storing the control information and PIN number, and determining the registration status of the PIN number for the initial setting of the PIN number and the control information and changes thereto. registration status determining means for determining whether or not to register the PIN number when the registration status determining means determines that the PIN number is unregistered; A process control device characterized by: a setting change means for determining the state after the password registration and changing the settings of control information including the password when it is determined that the password is registered. . (2) The setting change means determines the state of the PIN after registration, releases the locked state when the PIN is locked, compares it with the input PIN, and changes the control information including the PIN when they match. Claim No. 1 (1)
) The process control device described in section 2. (3) The setting change means determines the state after the password has been registered, compares it with the input password when the password is in the permitted state, and changes the control information including the password when they match. The process control device described in (1).