JPH0991008A - Input device for programmable controller - Google Patents

Abstract

PROBLEM TO BE SOLVED: To quickly execute the input/change of a control value to a programmable controller(PC) by making it possible to change a set point only by selecting operation for an increasing/decreasing direction symbol displayed on a screen. SOLUTION: A column (current value column) 11 for a control value already set up in the PC, a column (changed value column) 12 for a new control value to be set up from the current control value, an increasing/decreasing direction symbol (an increase button ↑ a descrease button ↓ etc.) 13, an increase/ decrease width column 14, etc., are displayed on a set point input window 10. An operator can change a set point only by the selecting operation of the symbol 13 displayed on the screen, so that the input time of the set point can be shortened. Since the already set current value and the changed value are simultaneously displayed in respective columns 11, 12 on the screen, the operator can confirm the existence of an input miss while observing the displayed contents and then write the changed value in the PC.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an input device for a programmable controller used for monitoring and controlling general industrial equipment.

[0002]

2. Description of the Related Art Conventionally, a programmable controller input device used for monitoring and controlling general industrial equipment, such as a maintenance tool, has a problem-oriented language, for example, a POL language. In this POL language, it is difficult to change the setting value, and improvement of operability is desired.

As shown in FIG. 12, a conventional maintenance tool comprises a CRT 80, a keyboard 81, an input / output device such as a mouse 82, and a main body 83.

As shown in FIG. 13, the main body 83 has an input means 92 for classifying an operator's input from a keyboard 81, a mouse 82, etc., a screen processing means 93, a display means 91, a POL program storage section 90, a transmission means. It is composed of 94 and the like. The CRT 80 is for displaying a program created by POL. The mouse 82 is an input device for selecting the POL symbol body and buttons. The keyboard 81 is an auxiliary input device for inputting characters such as set values. The screen processing means 93 creates data for displaying windows, messages and the like on the screen of the CRT 80. The display means 91 receives data for screen display and displays it on the CRT 80.
The POL program storage section 90 is a section for storing execution numbers and set values of each POL command of the POL program.
The transmission means 94 writes data to the programmable controller and reads data from the programmable controller.

Normally, the POL instruction used in the POL language program is provided with an execution number representing the execution order in the program. Since one POL command has a plurality of setting values, each setting value is numbered (hereinafter referred to as a setting value number).

In this maintenance tool, when a setting value is input for the POL command used in the POL program being executed, when the operator selects the POL command on the screen, the input control means 92 receives the input. The screen processing means 93 refers to the POL program storage section 90 to check the execution number corresponding to the selected POL command, and the transmitting means 9
The current value of each set value of the POL command of the execution number is read from the programmable controller through 4, and this is output to the display unit 91 and displayed on the screen of the CRT 80.

When the operator uses the keyboard 81 to key in the set value, the input means 92 writes the value in the programmable controller through the transmitting means 94.

By the way, the set value of the POL command written in the programmable controller is often changed due to changes in control conditions and other environmental conditions.

However, in the conventional maintenance tool, P
When changing the setting value of the OL command, the operator needs to key in a new setting value in the POL language.

The key input operation in the POL language is very troublesome for the operator, and if the number of setting items increases, the setting operation for it will take a lot of time.

[0011]

As described above, in the above-mentioned conventional maintenance tool, that is, the input device for the programmable controller, it is necessary for the operator to perform key input in the POL language to change the set value, and the number of set items increases. However, there has been a problem that it takes a lot of time to set it up and the operability is not good.

The operator also has an error in key operation and an input error in the set value. In this case, even if the operator inputs an unintended value, that value will be written to the programmable controller as it is, so if the control target of the programmable controller is, for example, a power plant, its operation will be adversely affected. There was a problem that it could fall into an uncontrollable state.

Further, even if the operator does not make a mistake in inputting the set value, if the input value intended by the operator is a value that adversely affects, for example, the power plant, the writing to the programmable controller cannot be prohibited. There was also a problem.

The present invention has been made to solve such a problem, and improves operability in inputting a control value (setting value) to be written in a programmable controller, and an operator makes a mistake in inputting the control value. If you do
An object of the present invention is to provide an input device for a programmable controller that can prevent writing to the programmable controller when the control value has a bad influence on the control target.

[0015]

In order to solve the above-mentioned problems, the invention according to claim 1 is an input device for a programmable controller for setting a control value to the programmable controller, wherein the programmable controller is already set. The present control value, the column of the change value to be newly set, the column of the increase / decrease width thereof, and the display means for displaying the selection symbol of the increase / decrease direction,
When the increase / decrease direction selection symbol displayed by the display means is selected, the increase / decrease width creating means for calculating the increase / decrease width for each selection operation from preset conditions and the increase / decrease width creating means And a set value creating means for calculating a change value which is a new control value from the increased / decreased range and the current control value and setting the calculated change value in the change value column.

In this case, since the operator can change the set value only by selecting the increasing / decreasing direction symbol displayed on the screen, the input time of the set value can be shortened.

At this time, since the current value and the changed value which have already been set are simultaneously displayed in the respective fields on the screen, the operator looks at the displayed contents and confirms whether or not there is an input error. The changed value can be written to the programmable controller.

According to a second aspect of the present invention, in a programmable controller input device for setting a control value to a programmable controller, the present control value already set to the programmable controller and a new control value to be set from now on. A display unit for displaying a change value field, a field for increasing / decreasing the range, and a selection symbol in the direction of increase / decrease, and an increase / decrease range for each time the selection symbol displayed by the display unit is selected once. The increase / decrease range creating means for calculating from the conditions that have been set, the increase / decrease range data storing means storing the increase / decrease range data for each control value separately from the increase / decrease range creating means, and the selection of the increase / decrease direction displayed by the display means. When a symbol is selected, one of the increase / decrease range creating means and the increase / decrease range data storing means is used in order of priority. An increase / decrease range determining means for determining a decrease range, an increase / decrease range determined by the increase / decrease range determining means, and the current control value are used to calculate a change value which is a new control value, and the change value is displayed in the change value column. And a setting value creating means for setting the setting value.

In this case, as in claim 1, the setting operation of the control value can be easily performed only by the selection operation on the screen, and the increase / decrease width data storing means is provided separately from the increase / decrease width creating means, so that the operator can operate as desired. The increase / decrease width can be changed, and the versatility of the input device can be improved.

Further, in the invention according to claim 3, in a programmable controller input device for setting a control value to a programmable controller, a current control value already set to the programmable controller and a new setting from now on. When the change value column, the increase / decrease width column, the display means for displaying the increase / decrease direction selection symbol, and the increase / decrease direction selection symbol displayed by the display means are selected, one selection operation is performed. A change value, which is a new control value, is calculated from the increase / decrease range creating means for calculating the increase / decrease range for each time from preset conditions, and the increase / decrease range calculated by the increase / decrease range creating means and the current control value. Then, the setting value creating means for setting it in the column of the change value and the control value are shown in correspondence with the change limit of the control value. Input limit information storing means for storing information, and a change value newly set by the set value creating means for a control value having an input limit of the input limit information storing means, a preset limit range. Input limit determining means for determining whether or not the change value, and the change value determined to be out of the limit range by the input limit determining means,
And a write prohibition unit that prohibits writing to the programmable controller.

In this case, since the rate of change of the control value can be limited within a certain limit range, it is possible to prohibit abrupt change of the set value that adversely affects the power plant, for example.

According to a fourth aspect of the present invention, in a programmable controller input device for setting a control value to a programmable controller, input means for inputting limit range data for each control value, and input by the input means. Limit value data storage means for storing the limited range data, a current control value that has already been set in the programmable controller, a change value column to be newly set, a column for increasing / decreasing the same, and an increase / decrease column. A display means for displaying the direction selection symbol and the increase / decrease direction selection symbol displayed by the display means,
A new control value is calculated from the increase / decrease range creating means for calculating the increase / decrease range for each selection operation from preset conditions, and the increase / decrease range calculated by the increase / decrease range creating means and the current control value. Setting value creating means for calculating a certain change value and setting it in the change value column, and input limitation for storing information indicating whether or not there is a change limitation for the control value in association with the control value. The change value set by the set value creating means is within the limit range stored in the limit value data storing means with respect to the control value having the input limitation of the information storing means and the input limit information storing means. An input restriction determining unit that determines whether or not the input value determining unit determines whether or not the change value determined by the input restriction determining unit to be out of the limit range is written to the programmable controller. There.

In this case, similarly to the third aspect, the rate of change of the control value is limited within a certain limit range to prohibit the input of a set value having a value that adversely affects the power plant, for example. By providing the limit value data storage means for storing the limit range data input by the input means, the operator can change the limit range as desired, and the versatility of the input device can be enhanced.

As a result, the usability of the input device for the programmable controller is improved, the input operability is improved, and writing to the programmable controller can be prevented in advance when the operator makes an input error in the control value.

[0025]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a diagram showing a configuration of a maintenance tool which is a first embodiment of a programmable controller input device according to the present invention, and FIG. 2 is a diagram showing a screen configuration of the maintenance tool of FIG.

As shown in FIGS. 1 and 2, this maintenance tool includes a POL program storage unit 1 in which a POL program is stored, a POL command 8 and a setting value input window 10.
And the like on the tuning screen 9, display means 2 for outputting a signal corresponding to a POL command selected by a selection input device such as a mouse, and a set value input window 10 is created by a signal from the input means 3. Screen processing means 4, transmission means 5 for exchanging data with the programmable controller, increase / decrease width creating means 6 for calculating increase / decrease width by calculation from preset conditions, and change value column 12 held in display means 2. Of the set value and sends it to the transmission means 5. In the setting value input window 10 above, there is a column of control values that have already been set in the programmable controller (current value column).
11. New control value column to be set (change value column)
12, an increase / decrease direction symbol (increase button ↑, decrease button ↓, etc.) 13, an increase / decrease width column 14, etc. are displayed.

That is, this maintenance tool displays a program written in the POL language on the tuning screen 9 of the display means 2, selects an arbitrary POL command from the screen with a mouse or the like, and includes it in the POL command. The input / change of the set value in the set value input window 10 is performed within a certain limit range.

The operation of this maintenance tool will be described below.

When the operator clicks a target POL command on the tuning screen 9 with a mouse or the like, for example, "UL" 8 to select the target, the input means 3 displays the PO.
A signal is output to the screen processing means 4 to notify that the L instruction "UL" 8 has been selected. With this signal, the screen processing means 4 creates a screen of the set value input window, and the set value input window 10 is displayed on the tuning screen 9 of the display means 2. Further, the screen processing means 4 retrieves the execution number of the selected POL instruction from the POL program storage unit 1 and reads the current value of the set value of the POL instruction of the execution number from the programmable controller via the transmission means 5. The screen processing means 4 outputs the current value to the display means 2, whereby the current value is displayed in the current value column 11 on the set value input window 10 of the display means 2.

Further, the screen processing means 4 also outputs the current value to the increase / decrease range creating means 6, and the increase / decrease range creating means 6 calculates the increase / decrease range based on the current value. The increase / decrease range here is the current value.
1%, etc. If this 1% is too small, 10% etc. will be returned and the result will be returned to the screen processing means 4.

The screen processing means 4 outputs the obtained increase / decrease range to the display means 2, and the display means 2 displays the value as the increase / decrease range column 1.
4 is displayed.

When the operator who confirms the display of the increase / decrease width column 14 clicks the increase button (decrease button) 13,
The input means 3 notifies the set value creation means 7 of the set value number indicating the number of the set value increasing / decreasing direction symbol (increase button ↑ or decrease button ↓) 13 of the set values included in the POL command. To do.

The set value creating means 7 examines the values displayed in the current value column 11 and the increase / decrease range column 14 held by the display means 2, and sets the value obtained by adjusting the increase / decrease range to the current value as the change value. ,
The value and the set value number are output to the screen processing means 4. The screen processing means 4 displays the changed value of the set value in the changed value column 12 of the display means 2.

The operator can confirm the displayed changed value and the current value, and if the value is incorrect, the operator can re-input at that time.

When the operator completes the operation of inputting the set value, the input means 3 notifies the set value creating means 7 of the fact, and the set value creating means 7 causes the changed value held in the display means 2 to be displayed. The value in column 12 is checked and written to the programmable controller via the transmission means 5.

As described above, according to the maintenance tool of the first embodiment, even when a large number of control values are input, the control value can be simply selected by operating the increase button ↑ or the decrease button ↓ on the set value input window 10. Since the setting work can be performed, the control value, that is, the setting value can be input / changed in a short time without key input.

The set value input window 10 also displays the current value that has already been set together with the changed value. Therefore, the operator can understand the input error of the changed value by comparing the current value with the changed value. It is possible to prevent the changed value thus written from being written to the programmable controller.

That is, by providing a function for inputting a set value by changing the set value for each preset change width by a selection operation on the screen with a mouse, the input / change of the set value is performed. It can be done in a short time without any operation,
In addition, input errors can be prevented.

Next, referring to FIGS. 3 to 5, the second embodiment of the present invention will be described.
A maintenance tool that is an embodiment of the present invention will be described. FIG. 3 is a diagram showing the configuration of the maintenance tool of the present invention, FIG. 4 is a flow chart showing the increase / decrease range creation operation of this maintenance tool, and FIG. 5 is a diagram for explaining the increase / decrease range table used by this maintenance tool.

In the first embodiment, the range of increase / decrease of the set value is fixed to the value obtained from the current value. In the second embodiment, in addition to the first embodiment, the setting value is set. The function for fixing the increase / decrease range for each value to a value predetermined by the operator is added.

In this case, the operation of inputting the increase / decrease value is performed by the operator using the mouse to select the target P on the tuning screen 9.
Select the change target by clicking the OL command,
This is done by keying in the increment / decrement range.

It is assumed that the POL command is distinguished by the execution number, and the value input by the operator is stored in the increase / decrease range data storage unit 36 in the form of the increase / decrease range table 38 shown in FIG. For example, when the increase / decrease range of the first set value of the POL command “HL” of the execution number “5” in the increase / decrease range table 38 is input, the value of the corresponding increase / decrease range in the increase / decrease range table 38 is updated. The setting value input operation is performed in the same manner as in the first embodiment, but the increase / decrease range displayed in the set value input window 10 is determined according to the increase / decrease range determination operation described below.

In this case, when the operator decides which setting value of the POL command to change and selects the setting value number,
The input means 32 outputs the set value number to the screen processing means 33.

The screen processing means 33 retrieves the execution number of the POL command from the POL program storage section 30 (S
1), the execution number and the set value number are output to the increase / decrease range creating means 35. The increase / decrease range creating means 35 searches the increase / decrease range data storage unit 36 (S2) to check whether there is data of the increase / decrease range corresponding to the execution number and the set value number.

If there is no increase / decrease width data (N in S2), 1% of the set value before the change is set as the change width (S3).

If the increase / decrease width data exists (Y in S2), the increase / decrease width data in the increase / decrease width data storage unit 36 is set as the increase / decrease width (S4). Increase / decrease range 1
Display in 4.

As described above, according to the maintenance tool of the second embodiment, even when a large number of control values are input, the increase button ↑ or the decrease button ↓ of the set value input window 10 is used as in the first embodiment. Since the control value setting operation can be performed only by selecting, the control value, that is, the setting value can be input / changed in a short time without key input.

On the set value input window 10,
Since the current value that has already been set is also displayed together with the changed value, the operator can select the changed value by comparing the current value with the changed value after selecting, and write the changed value that was erroneous to the programmable controller. This can be prevented in advance.

Further, since the increase / decrease width data storage unit 36 is provided separately from the increase / decrease width creating means 35, the operator realizes the function of changing the change width for each set value included in the POL command as desired. Therefore, the versatility of the maintenance tool can be improved.

Next, the maintenance tool of the third embodiment will be described with reference to FIGS. FIG. 6 shows a third embodiment of the present invention.
FIG. 7 is a diagram showing a configuration of a maintenance tool of the embodiment, FIG. 7 is a flowchart showing a setting value changing processing operation of the maintenance tool,
FIG. 8 is a diagram showing an input restriction table used in this maintenance tool.

In the first and second embodiments described above, writing to the programmable controller is permitted regardless of the change value of the set value. However, in the third embodiment, A function is provided to limit the input so as to prevent a sudden change in the set value. If the set value is not within the limit range, writing to the programmable controller is prohibited. Whether or not to restrict the input is specified for each POL command.

The operation of selecting the POL command for input restriction is performed by the operator clicking the target POL command on the tuning screen with a mouse or the like.

The POL command is distinguished by the execution number, and the operator input result is the input restriction table 4 shown in FIG.
It is stored in the input restriction data storage unit 46 in the format of No. 7.

For example, the execution number "12" in the input restriction table 47
If the POL command “I” is selected, the corresponding input value restriction column 48 of the input restriction table is updated to “present”.

The set value updating process will be described below with reference to the flowchart of FIG.

The operator selects the desired POL command,
The procedure for creating a changed value by clicking the increase / decrease symbol is the same as in the first and second embodiments (S
70, S71).

Then, when the operator finishes the operation of inputting the changed value, the input means 42 inputs it to the input restriction determination means 4.
Notify 5 The input restriction determination means 45 refers to the input restriction data storage unit 46 to check whether or not there is an input restriction for the POL command of the execution number checked in S70 (S72).

When there is no input restriction for the POL command (N in S73), the changed value input by the operator is written as it is to the programmable controller through the transmission means 44 (S76).

On the other hand, when there is an input restriction (Y in S73), the input restriction is applied to all the set values of the POL command. The maximum value of the changed value is twice the current value, and the minimum value is 1/2 of the current value (S74).

If the changed value input by the operator is within this range, that value is written in the control device (S76).

On the other hand, if it is outside the range, the screen processing means 43 is notified that the setting is impossible. Screen processing means 43
Displays a message on the screen of the display means 41 (S75) to inform the operator that the setting is impossible. In this way, writing of the changed value outside the limit range is prohibited.

As described above, according to the maintenance tool of the third embodiment, the rate of change in one control value change can be limited within a certain limit range.

That is, it is possible to realize the function of prohibiting the writing of the set value out of the limit range for each POL instruction to the programmable controller.

Next, a maintenance tool according to the fourth embodiment of the present invention will be described. FIG. 8 shows a block diagram of the maintenance tool of the present invention. FIG. 10 is a flow chart showing the processing operation for determining the input range of this embodiment, and FIG. 11 is a view for explaining the input range table used by this maintenance tool.

In the third embodiment, the inputtable range of the set value is the range obtained from the current value. In the maintenance tool of the fourth embodiment, the input range is added in addition to the third embodiment. Is added to the range determined by the operator.

The operation of determining the input range is performed by the operator selecting the target by clicking the target POL symbol on the tuning screen with a mouse or the like and by key-inputting the minimum value and the maximum value.

The POL instruction is distinguished by the execution number.
The minimum value and the maximum value are stored in the limit value data storage unit 57 as shown in FIG.
The input range table 58 shown in FIG.

For example, as the set value number "1" of the POL command "HL" of the execution number "5" in the input range table 58, "12" is set as the minimum value and "18" is set as the maximum value. When a new minimum value and maximum value are newly input with the execution number “5”, the corresponding minimum value and maximum value in the input range table 58 are updated.

The procedure for the operator to select a POL command and then to click the increase / decrease direction symbol to create a changed value is the same as in the first to third embodiments.

In the maintenance tool of the fourth embodiment, when the operator finishes the operation of inputting the changed value in the flowchart of FIG. 7, a portion (S74) for determining whether or not to write the changed value in the programmable controller is provided. The processing is as shown in FIG.

In this case, when the operator finishes inputting the set value, the input means 52 outputs the set value number to the input restriction determining means 55, and the input restriction determining means 55 restricts whether or not there is an input restriction for the POL command. The table 47 is checked (S72 in FIG. 7).

If there is an input limit, the control value data storage 57 is searched for the presence / absence of minimum and maximum value data corresponding to the execution number and the set value number, and the input range table 58 is checked. If there is data such as the minimum and maximum values as a result of this search (Y in S90 of FIG. 10), the values are set as the minimum and maximum values (S91).

If the data is not present (N in S90), the maximum value is twice the current value and the minimum value is 1/2 the current value (S92).

In this way, the inputtable range is determined, and if the maximum value> the changed value and the changed value> the minimum value (Y of S93), that is, the changed value within the limited range is written to the programmable controller. If (N of S93),
That is, for the changed value outside the limit range, writing to the programmable controller is prohibited, and a message indicating that the writing is prohibited is displayed on the display unit 2.

As described above, according to the maintenance tool of the fourth embodiment, like the third embodiment, the change of the set value can be limited within a certain limit range.

Further, since the limit value data storage means is provided, the operator can set the increase / decrease width as desired, so that versatility can be improved.

That is, it is possible to realize the function of setting the inputtable range on the operator side for each set value included in the POL command.

[0079]

As described above, according to the first aspect of the present invention, even when a large number of control values (set values) of the programmable controller are input / changed, the operator only needs to select the control values on the screen to display the control values. Since the setting operation can be easily performed, the control value input operation can be completed in a short time.

At this time, since the current value and the changed value which have already been set are simultaneously displayed in the respective fields on the screen, the operator looks at the displayed contents and confirms whether or not there is an input error. The changed value can be written to the programmable controller.

According to the second aspect of the present invention, similarly to the first aspect, the operator can easily perform the control value setting operation only by the selection operation on the screen, and the control value input operation is completed in a short time. can do. Further, since the increase / decrease width data storage means is provided separately from the increase / decrease width creating means, the increase / decrease width can be changed by the operator as desired, and the versatility of the input device can be enhanced.

Further, according to the third aspect of the present invention, since the rate of change of the control value can be limited within a certain limit range, for example, abrupt control value change that adversely affects the power plant or the like is prohibited. be able to.

Further, according to the invention of claim 4, in addition to the effect of claim 3, by providing the limit value data storage means, the operator can change the limit range as desired, and the general-purpose input device can be used. You can improve your sex.

As a result, the operability in inputting the control value (setting value) to be written into the programmable controller is improved, and the control value which adversely affects the controlled object when the operator makes a mistake in inputting the control value. In such a case, writing to the programmable controller can be prevented in advance.

[Brief description of drawings]

FIG. 1 is a diagram showing a configuration of a maintenance tool according to a first embodiment of the present invention.

FIG. 2 is a diagram showing a screen of a maintenance tool according to the first embodiment.

FIG. 3 is a diagram showing a configuration of a maintenance tool according to a second embodiment of the present invention.

FIG. 4 is a diagram illustrating a process of determining an increase / decrease range according to the second embodiment.

FIG. 5 is a diagram illustrating an increase / decrease range table according to the second embodiment.

FIG. 6 is a diagram showing a configuration of a maintenance tool according to a third embodiment of the present invention.

FIG. 7 is a diagram illustrating a setting value writing process according to the third embodiment.

FIG. 8 is a diagram illustrating an input restriction table according to the third embodiment.

FIG. 9 is a diagram showing a configuration of a maintenance tool according to a fourth embodiment of the present invention.

FIG. 10 is a diagram illustrating a process of determining an input range according to the fourth embodiment.

FIG. 11 is a diagram illustrating an input range table according to the fourth embodiment.

FIG. 12 is a diagram showing a configuration of a conventional maintenance tool.

FIG. 13 is a diagram showing a configuration of a conventional maintenance tool.

[Explanation of symbols]

1, 30, 40, 50 ... POL program storage section 2,
31, 41, 51 ... Display means, 3, 32, 42, 52 ...
Input means 4, 33, 43, 53 ... Screen processing means 5,
34, 44, 54 ... Transmission means, 6, 35 ... Increasing / decreasing width creating means, 7, 37 ... Setting value creating means, 8 ... POL command, 9 ...
Tuning screen, 10 ... Setting value input window, 11
... current value column, 12 ... changed value column, 13 ... increase button (decrease button), 14 ... increase / decrease range column, 36 ... increase / decrease range data storage section, 4
5, 55 ... Input restriction determination means, 46, 56 ... Input restriction data storage section, 57 ... Limit value data storage section.

Claims (4)

[Claims] 1. An input device for a programmable controller that sets a control value to a programmable controller, wherein a current control value that has already been set in the programmable controller, a change value column to be newly set, and the like And a display means for displaying the increase / decrease width column and the increase / decrease direction selection symbol, and when the increase / decrease direction selection symbol displayed by the display means is selected, the increase / decrease width for each selection operation is preset. Increase / decrease width creating means for calculating from the condition that is, from the increase / decrease width and the current control value calculated by the increase / decrease width creating means, calculate a change value that is a new control value,
An input device for a programmable controller, comprising: a set value creating means for setting it in the change value column. 2. An input device for a programmable controller that sets a control value to a programmable controller, wherein a current control value that has already been set in the programmable controller, a change value column to be newly set, and the like And a display unit for displaying the increase / decrease width column and a selection symbol in the increase / decrease direction, and each time the selection symbol displayed by the display unit is selected, the increase / decrease width is calculated from preset conditions. An increase / decrease range creating means, an increase / decrease range data storage means storing the increase / decrease range data for each control value separately from the increase / decrease range creating means, and a selection symbol in the increase / decrease direction displayed by the display means is selected, An increase / decrease range for determining the increase / decrease range by using one of the increase / decrease range creating means or the increase / decrease range data storage means in the order of priority A constant section, from the determined varying width the current control value by said varying width determining means calculates an a new control value change values,
An input device for a programmable controller, comprising: a set value creating means for setting it in the change value column. 3. An input device for a programmable controller that sets a control value to a programmable controller, wherein a current control value that has already been set in the programmable controller, a change value column to be newly set, and the like And a display means for displaying the increase / decrease width column and the increase / decrease direction selection symbol, and when the increase / decrease direction selection symbol displayed by the display means is selected, the increase / decrease width for each selection operation is preset. Increase / decrease width creating means for calculating from the condition that is, from the increase / decrease width and the current control value calculated by the increase / decrease width creating means, calculate a change value that is a new control value,
Setting value creating means for setting it in the change value column; input limit information storing means for storing information indicating whether or not there is a change limit for the control value in association with the control value; Input restriction determining means for determining whether or not the changed value newly set by the setting value creating means for the control value with the input restriction of the restriction information storage means is within the preset limit range. An input device for a programmable controller, comprising: and a write prohibiting unit that prohibits writing to the programmable controller for a change value determined by the input limit determining unit to be outside the limit range. 4. An input device for a programmable controller for setting a control value to a programmable controller, wherein input means inputs limit range data for each control value, and limit range data input by the input means is stored. A limit value data storage means, a current control value that has already been set in the programmable controller, a change value column to be newly set, an increase / decrease width column thereof, and an increase / decrease direction selection symbol. A display unit for displaying the increase / decrease direction, and an increase / decrease width creating unit for calculating an increase / decrease width for each selection operation when a selection symbol in the increase / decrease direction displayed by the display unit is selected; From the increase / decrease width calculated by the width creating means and the current control value, a change value that is a new control value is calculated,
Setting value creating means for setting it in the change value column; input limit information storing means for storing information indicating whether or not there is a change limit for the control value in association with the control value; Input for determining whether or not the change value set by the set value creating means is within the limit range stored in the limit value data storing means with respect to the control value having the input limitation of the limit information storing means. An input for a programmable controller, comprising: a limit determination unit; and a write inhibition unit that inhibits writing to the programmable controller for a change value determined by the input limitation determination unit to be outside the limit range. apparatus.