JPH0685124B2 - Programmable controller - Google Patents

Description

Description: FIELD OF THE INVENTION The present invention relates to a stored program type programmable controller.

<< Outline of the Invention >> In the present invention, in addition to the basic operation as a controller that determines the output state by executing a user program, various service operations such as a tool service, a PC link service, a host link service, and an abnormality check service are performed. Stored program type programmable with
In the controller, specific modes of the basic operation and various service operations can be set through a user program.

<< Prior art and its problems >> Conventionally, in this type of programmable controller, in addition to the basic operation as a controller that determines the output state by executing a user program, a tool service, a PC link service, a host Various service operations such as link service and abnormality check service are performed.

Also, various basic operation modes and various service operations can be selected from various operation modes.
For example, immediately after the power is turned on, it is possible to select the basic operation mode or the program mode immediately, and the I / O relay area is cleared or retained when the basic operation is switched from stop to start. Further, it is possible to select whether to ignore or detect the rising of the differential instruction during the interlock during execution of the basic operation.

Further, while the tool service is operating, it is possible to select whether the messages on the programming console are in English or Japanese, and whether reading or writing of the user program is possible or prohibited. You can choose whether to enable all operations for programming console operation,
Alternatively, it is possible to select whether to allow only reading and writing of the I / O memory.

Conventionally, these selections are usually determined by key operation of a programming console based on designated information registered in the work area or I / O memory.

However, in such a conventional method, when the user program is copied to other hardware, the designated information must be re-registered each time, and the work area is normally backed up when the power is cut off. Since it does not exist, it is necessary to re-register the specified information each time the power is turned on. Furthermore, since the I / O memory can be read / written, if the I / O number for storing specified information is mistakenly used,
There has been a problem that unnecessary writing operation is performed and designated information is destroyed.

<Object of the Invention> An object of the present invention is to eliminate the need for re-registering the designation information for determining the operation mode every time the power is turned on in this type of programmable controller, and to save the user program in another hardware. Even if it is copied to software, re-registration is not required.

<< Structure and Effect of Invention >> In order to achieve the above object, the present invention has a tool service, a PC link service, and a host link service in addition to a basic operation as a controller that determines an output state by executing a user program. In a programmable controller that performs various service operations such as an abnormality check service and determines each operation mode based on pre-registered information, the operation mode is selected from the user program before the user program is executed. Search for the opcode corresponding to the setting command,
And a means for registering operation mode information based on the contents, and a means for NOP processing the operation mode setting command when the operation code is read from the user program during execution of the user program. It is characterized in that the basic operation and various service operation modes can be set through a user program.

With such a configuration, the basic operation and various service operation modes can be set through the user program, and since the user program is backed up by the battery when the power is cut off, re-registration is performed every time the power is turned on. Need not be performed, and if the user program is copied to other hardware, the operation code and operand corresponding to the operation mode setting instruction can be ported to the other hardware at the same time. There is no need to re-register each time you make a copy.

<< Description of Embodiments >> FIG. 1 is a block diagram showing an electrical hardware configuration of a programmable controller to which the present invention is applied.

As shown in the figure, this programmable controller includes a microprocessor 1, an input unit 2, an output unit 3, a tool interface 4, a user program memory 5, a system memory 6, an input / output memory 7, a working memory 8 and a programming memory. A console 9 is provided.

The microprocessor 1 is designed to perform basic operations and various service operations necessary for the programmable controller according to a system program stored in the system memory 6.

The basic operations required for a programmable controller are
As is well known, an input update operation of writing the input data read from the input unit 2 into the input area of the input / output memory 7 and the input / output data of the input / output memory 7 are referred to and the user program memory 5 The user program in the inside is executed, and the output data in the input / output memory 7 after the instruction execution process of rewriting the output data of the input / output memory 7 by the execution result and the rewriting of the result of the instruction execution is completed from the output unit 3 It is composed of the output update processing to be sent to.

Also, as various service processes, in this example, there are an abnormality check process that resets the watchdog timer, a user program memory check, an I / O bus check, and a tool service process that processes a command from the programming console. It consists of

Further, particularly in this example, in the abnormality check processing, the watchdog timer monitoring time is used as a reference to monitor the execution cycle of the user program, and the predetermined power failure detection time is used as a reference to perform the instantaneous power failure detection processing. There is.

Also, in the tool service processing, in addition to displaying messages in Japanese or English on the LCD display 9 of the programming console, the programming console 9
The user program is read and written according to the key operation of.

In the programmable controller having the above configuration, the present invention newly defines the operation mode setting instruction as shown in FIG. As shown in the figure, this operation mode setting instruction is composed of an operation code described as FUN 49 and first to third operands.

Then, as shown in FIG. 4, the content of the first operand is the first bit when the 0th bit indicates the mode designation of the PC when the power is turned on.
The second bit is used to handle the I / O relay area when switching between stop and operation, the second bit is used to detect whether or not the rising edge of the differential instruction during interlock is detected, and the eighth bit is programmed.
The 9th bit is used for reading / writing the user program and the 10th bit is used only for the operation of the programming console to specify English / Japanese text of the console message.

That is, by writing "1" or "0" in these bits, the operation mode can be specified.

Although not shown, in the second operand, data in ms unit corresponding to the momentary power failure detection time is described in BCD 4 digits, and in the third operand, data in ms unit corresponding to watchdog timer monitoring time is BCD 4 digits. It is designed to be described in.

Next, FIG. 2 is a flowchart showing the software configuration of the device of the present invention, and the operation of the device of the present invention will be systematically described below with reference to this flowchart.

In FIG. 2, when the program is started by turning on the power, it is immediately determined whether or not the operation mode setting command exists at the head of the user program (step 201).

If there is no operation mode setting command here (step 20
1 negative), the operation mode is set according to the preset default value, and the basic operation and various service operations described above are set to the standard operation mode (step 20).
3).

On the other hand, if it is determined that there is an operation mode setting command at the beginning of the user program (Yes at step 201), the basic operation described above is performed according to the contents of the first to third operands shown in FIGS. 3 and 4. And various service operations are set to the specified operation mode.

That is, if the 0th bit of the first operand is "0", the PC mode at power-on is set to the program mode, and if it is "1", the operation mode is set.

If the first bit is "0", the I / O relay area is cleared when switching from stop to operation, while if it is "1", it is held.

If the second bit is "0", the rising edge of the differential instruction during interlock is ignored, whereas if it is "1", the rising edge is detected.

If the 8th bit is "0", the message of the programming console is designated as a Japanese sentence, while if it is "1", it is designated as an English sentence.

If the 9th bit is "0", reading and writing of the user program are permitted, whereas if "1", reading and writing are permitted.
Writing is prohibited.

If the 10th bit is "0", programming console operations are permitted for all operations, while if it is "1", only I / O memory read / write operations are permitted. It

If the second and third operands describe the instantaneous power failure detection time and the watchdog timer monitoring time, respectively, the corresponding time is set.

Then, a conventional power-on initialization process is performed (step 204), and various relays, counters, etc. are initialized here.

After that, from the keyboard of programming console 9
Until the RUN command is given (No at Step 205), known I / O refresh (Step 206) and peripheral device service (Step 207) are performed. The output data of 7 is sent from the output unit 3 to the outside, while the data taken from the input unit 2 is written to the input area to the input / output memory 7.

Further, in various service processing (step 207), various tool service processing such as program writing processing and monitor processing is performed according to the above-mentioned setting contents in response to a command from the programming console 9.

In this state, RU on the programming console 9
When the N operation is performed (Yes at Step 205), the execution of the user program is immediately started.

In this execution start, first, the contents of the program counter are initialized to zero, then the first opcode is read from the beginning of the user program memory 5, and it is determined whether or not this is an operating state setting command (step 208). .

If it is not the operation mode setting command (No at Step 208), the user program execution process (Step
210), I / O refresh processing (step 211) and various service processing (step 212).

On the other hand, at the beginning of the user program, as shown in FIGS.
If the operation mode setting command shown in the drawing is described (Yes at step 208), the operation mode setting command at the 0th step is subjected to so-called NOP processing and is ignored.

Therefore, even if the operation mode setting command is described at the head of the user program and the automatic setting process in step 202 is performed, it has no effect on the execution of the user program.

Thereafter, a normal user program execution process is performed (step 210). As is well known here, the user program is executed by referring to the input / output data of the input / output memory 7, and the input / output is executed according to the execution result. The output data of the memory 7 will be rewritten. When the END instruction is read from the end of the user program, the user program execution process ends.

Thereafter, similar to steps 206 and 207 described above, I / O refresh (step 211) and various services (step 2)
12) is performed, and thereafter the user program is executed as usual.

As described above, according to the apparatus of the above embodiment, if the operation mode setting command 10 shown in FIG. 3 is described at the beginning of the user program, the basic operation and various service operations are performed by the processing of step 202 thereafter. The operation mode regarding is automatically set, and thereafter, each operation is performed according to the set contents.

Further, since the user program memory 5 is normally backed up by the battery when the power is cut off, even if the power is cut off, the operation mode setting command 10 described at the beginning of the user program is not lost, and Therefore, the complexity of resetting the operation mode each time the power is turned on can be avoided.

Further, even if the user program is ported to other hardware having the same configuration, the operation mode setting instruction is simultaneously ported at the time of porting, and therefore the operation mode setting operation is performed each time the user program is copied. It also avoids the hassle of having to do it.

[Brief description of drawings]

FIG. 1 is a block diagram showing an electrical hardware configuration of a programmable controller according to the present invention, FIG. 2 is a flow chart showing the software configuration, FIG. 3 is a mnemonic diagram showing a configuration of an operation mode setting instruction, FIG. 4 is a memory map showing the contents of each bit of the first operand. 1 ... Microprocessor 2 ... Input unit 3 ... Output unit 4 ... Interface 5 ... User program memory 6 ... System memory 7 ... Input / output memory 8 ... Working memory 9 ... Programming console 10 ... Operation mode setting command

Claims (1)

[Claims] 1. In addition to the basic operation as a controller that determines the output state by executing a user program, various service operations such as tool service, PC link service, upper link service, and abnormality check service are performed, and in advance. In a programmable controller in which each operation mode is determined based on the registered information, before executing the user program, search the operation code corresponding to the operation mode setting instruction from the user program,
And a means for registering operation mode information based on the contents, and a means for NOP processing the operation mode setting command when the operation code is read from the user program during execution of the user program. A programmable controller characterized in that the basic operation and various service operation modes can be set via a user program.