JPS6128122B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention comprises a timer or/and counter;
The present invention relates to a sequence controller that executes a sequence by combining a sequence command stored in a program storage unit with a signal from the timer or/and counter as necessary.

Conventionally, the set values of the timer or (and) counter built into the sequence controller are stored as one of the sequence commands in the program storage section of the sequence controller, and the storage element of the program storage section is RAM (RANDOM ACCESS).
MEMORY), etc., the setting values of the timer or (and) counter must be changed using a dedicated program writer, and the memory element of the program storage section is ROM.
In the case of an element that can only be read (REED ONLY MEMORY), the set values of the timer and/or counter can be changed by rewriting the program using a ROM-dedicated writer that can be erased with ultraviolet light.

However, in the above-mentioned method, when using a program writer etc., the operation of the sequence controller is temporarily stopped.
There are a number of handling precautions, not everyone can do it, and there are drawbacks such as the inability to change the set values of the timer and/or counter while performing an actual operation test during adjustment. In addition, the memory element of the program storage unit is ROM
In the case of an element that can only be read, such as the above, an extremely complicated change operation is required as described above, so in reality, the setting values of the timer or (and) counter that may be changed are programmed as sequence instructions. It is not possible to do so, and a timer or counter whose set value can be changed must be installed externally via an input/output section, making the configuration complicated and expensive.

Now, FIG. 1 is a block diagram of an example of a sequence controller having the above-mentioned drawbacks. In the figure, 1 is the program reading section, 2 is the ROM
or a program storage unit consisting of RAM, etc., 3
4 is a counter and timer control section; 5 is an output section; and 6 is an input section. The general operation is based on the read signal 1a of the program read unit 1.
The sequence command 2a programmed in the program storage unit 2 is read out, and the sequence command 2a causes the calculation unit 3 to perform calculations based on the input data 6a from the input unit 6 and the internal data contained in the calculation unit 3. The result is outputted as output data 5a, and a signal for controlling an external controlled device is sent out via the output section 5. Further, if the sequence instruction 2a to the calculation unit 3 is related to a timer or counter, the instruction 3a for controlling the timer or counter causes the timer or counter control unit 4 to
The set value 3b of the timer or counter included in the sequence instruction 2a
Data 4a such as a timer up signal or a count up signal generated when the timer up signal is reached is sent to the calculation section 3 as calculation data. Therefore, as a matter of course, only the set values of the timer and/or counter that are fixed in advance in the sequence instruction 2a can be used, which has the above-mentioned drawbacks of the conventional method.

The present invention has been proposed in view of the above-mentioned conventional drawbacks, and it is possible to change set values using a general digital setting device or the like with a simple operation and even during actual operation. The present invention provides a sequence controller having a timer or/and counter that can perform the following steps. An embodiment of the present invention will be described in detail below with reference to FIG. In the figure, the same symbols as in FIG. 1 represent the same articles.

Now, FIG. 2 shows the main parts of the present invention in which a set value selection section 7, an external set value storage section 8, an external setter 9, and a set value display section 10 are newly added. That is, in the sequence controller according to the present invention, the sequence instruction 2a' is accompanied by an instruction for specifying a timer or counter setting value, and that instruction includes an external setting value storage section as the timer or counter setting value. It has an instruction for specifying whether to use the program stored in the program storage section 8 or the program storage section 2. Therefore, this command is decoded by the calculation section 3 and inputted to the setting value selection section 7 and the external setting value storage section 8 as the selection signal 3c. Here, sequence instruction 2
When a' is an instruction to determine the setting value of a timer or counter by the external setting value storage section 8, the data accompanying the sequence instruction 2a' is the external setting value in which the setting value of the timer or (and) counter is stored. It becomes a predetermined address signal of the value storage section 8, and when the sequence instruction 2a' is an instruction indicating that the set value of a timer or counter stored in the program storage section 2 is used, the sequence instruction 2a' The data associated with ' becomes the internal set value data signal of the timer or counter. In this embodiment, the data accompanying the sequence command 2a', which becomes an address signal or an internal set value data signal, is simply called data and is indicated as 3b'. That is, the data 3b' included in the sequence instruction 2a' read from the program storage section 2 is input to the calculation section 3, decoded by the calculation section 3, and input to the setting value selection section 7 and the external setting value storage section 8. do. External setting device 9
A first digital switch for setting the data to be stored, that is, a set value of the timer or (and) counter, and a second digital switch for specifying the address when storing the set value in the external set value storage section 8. It is comprised of operation switches such as a digital switch and a push button switch that generates a signal for writing data set by each of the switches into the external setting value storage section 8 at a desired timing. The signal 9a is a signal containing set value data set by the first digital switch, address data set by the second digital switch, and a write signal by the push button switch. The external setting value storage section 8 sends the data written from the external setting device 9 to the setting value selection section 7 as external setting value data 8a, and is composed of a 7-segment LED, a decoder driver circuit for the 7-segment LED, etc. The external set value data 8a is also sent to the set value display unit 10, and each LED of the set value display unit 10 is driven to display the contents of the external set value data 8a. The set value selection section 7 selects either of the internal set value data 3b' or the external set value data 8a as the set value data of the timer/counter control section 4 in response to a selection signal 3c'. The data is configured to be sent to the timer/counter control section 4 as timer or counter setting value data 7a.

The operation mode of the above configuration will be explained. First, if the sequence command 2a' read from the program storage unit 2 is a sequence command that sets a timer time based on the setting value stored in the program storage unit 2, for example [PREST.T.100], then the sequence command 2a', that is, [100] in [PRESET.T.100] is the setting value for the timer, and when the arithmetic unit 3 decodes this and the selection signal 3c' is an "H" level signal, this signal is At the same time as being output to the setting value selection section 7 and setting value storage section 8, the command "100" is inputted to the setting value selection section 7 and setting value storage section 8 as data 3b' together with the selection signal 3c'. The setting value selection section 7 receives the selection signal 3.
Since c′ is at “H” level, data 3
b' is selected and [100] is output to the timer/counter control section 4 as the set value data 7a. The "H" level of the selection signal 3c' is a signal that prevents the external set value storage section 8 from receiving the write signal 9a from the external setter 9 and prevents writing.

Next, assume that the sequence command 2a' read out from the program storage section 2 is a sequence command for setting a timer time according to the setting value stored in the external setting value storage section 8, for example [EXIT.T.010]. Note that [010] in [EXIT.T.010] is input to the calculation unit 3, which decodes that [010] in the command [EXIT.T.010] is an address signal for the external setting value storage unit 8. The selection signal 3c' is outputted to the set value selection section 7 and the external set value storage section 8 at "L" level.
At the same time, the instruction [010] is output as data 3b'. At this time, since the selection signal 3c' is at the "L" level, the external set value storage unit 8 receives the write signal 9a from the external setter 9 and is in a state where it can write. The data set by the external setting unit 9 is outputted from the storage unit 8 to the counter/timer control unit 4 as desired external setting value data 8a. Since the selection signal 3c' is at the "L" level, the setting value selection section 7 selects the external setting value data 8.
a, outputs it to the timer/counter control section 4 as setting value data 7a, sends the timer time signal 4a from the timer/counter control section to the calculation section 3, performs calculation processing in the calculation section 3, and sets the desired timer. A signal for performing a sequence control operation including elements is sent to the input/output sections 5 and 6.

Since the present invention is configured and operates as described above, it is possible to write and change the set values of the timer and/or counter even while the sequence controller is in operation, resulting in a dramatic improvement in handling and operability. It is something that plays.

[Brief explanation of the drawing]

FIG. 1 is a block circuit diagram showing the configuration of a conventional sequence controller. FIG. 2 is a block circuit diagram of one embodiment showing the configuration of the sequence controller of the present invention. 3... Arithmetic unit, 4... Timer counter control unit,
7... Setting value selection section, 8... External setting value storage section,
9...External setting device.

Claims (1)

[Claims] 1. A sequence controller that has a built-in timer or (and) counter and executes a sequence by combining the signal of the timer or counter as necessary with the sequence command stored in the program storage unit, and even during the execution of the sequence, the In a sequence controller having means capable of changing the set value of a timer or counter,
A means for changing the set values of the timer and/or counter even during execution of a sequence is provided separately from the set values of the timer and/or counter stored in the program storage unit. A set value storage unit constituted by storage means such as RAM for storing set values, a display unit for displaying the set values written in the set value storage unit, and a means for writing the set values in the set value storage unit. and a set value that sends the set value to the counter/timer control unit in accordance with a sequence instruction that determines whether the set value of the timer or (and) counter is to be read from a program storage unit or a set value storage unit. A sequence controller comprising: a selection section;