JP3396561B2 - Programmable controller - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a programmable controller widely used for controlling industrial systems such as steel, public systems such as paper manufacturing plants and water and sewage systems, and automobile industry.

[0002]

2. Description of the Related Art Programmable controllers (hereinafter referred to as P
The abbreviation "C" is usually configured so that the execution status can be confirmed from a monitor device for the purpose of monitoring the execution status of the sequence program and debugging.

There are various methods for monitoring the execution status.
After scanning the sequence program once, the contents of the operands used in the monitor range program are collected from the memory in the PC and sent to the monitor device.
A method of displaying the contents on the program screen on the monitor side, or a method of detecting that the program is running within the monitor range during program execution and collecting the actual execution output and operand values and sending them to the monitor The latter is the preferred method because it collects the actual data.

[0004]

Generally, a PC is designed on the assumption that it is connected to one monitor device.
Therefore, when a plurality of monitor devices are connected and a plurality of monitor requests are made, the requests are sequentially executed to the plurality of monitor devices, and the real time performance of the monitor is lost. There is. Further, since the above-mentioned method of collecting actual data usually does not support monitoring over a plurality of ranges, it is impossible to monitor in real time.

In recent years, a multi-window type personal computer has been used and a personal computer has been used in a network environment, and a plurality of monitor requests have been issued to a single personal computer. .

The present invention has been made in view of the above circumstances. An object of the present invention is to store a plurality of monitor requests in a PC and to detect execution request data while detecting a monitor request range at any time during program execution. It is an object of the present invention to provide a programmable controller that outputs monitor information at the same time within one scan in response to a monitor request having a different program range, which occurs irregularly from a plurality of monitor devices by monitoring.

[0007]

In order to achieve the above object, the programmable controller of the present invention is configured as follows. According to the invention of claim 1, the monitor request storing means for storing a plurality of monitor requests generated from the monitor device and the monitor request ranges overlap from the stored plurality of monitor requests .
Monitor execution instructing means for generating an execution monitor request for one program in response to an execution monitor request for a program,
A monitor data collecting means is provided for collecting data for a plurality of monitor requests according to the execution monitor request of the generated program.

According to a second aspect of the invention, the monitor request includes a monitor start address and a monitor stop address, and the monitor request storage means stores a plurality of registers for storing the monitor start address and the monitor stop address for each monitor request. The monitor execution instruction means sets a monitor execution request flag when the execution address of the sequence program coincides with the monitor start address and the monitor stop address when the sequence operation CPU executes the sequence program, and When reset and at least one monitor execution request flag is set, it is means for generating an execution monitor request for the one program, and the monitor data collecting means executes the sequence program in response to the execution monitor request. Mode for monitoring the status A data monitor circuit to collect the metadata, a monitor data memory for storing the monitor data, when it is within the monitoring range stores an execution state of the sequence program for a plurality of monitoring requests to monitor the data memory.

According to the third aspect of the present invention, it is detected from the information of a plurality of registers storing a plurality of monitor requests that the monitor requests are duplicated at the execution address of interest of the sequence program.

According to a fourth aspect of the present invention, the monitor data collecting means attaches the program addresses of the monitor start point and the monitor stop point to the collected monitor data and stores them in the monitor data memory.

According to a fifth aspect of the present invention, the monitor data collecting means adds the sequence circuit number from the monitor start point to the collected monitor data and stores it in the monitor data memory.

[0012]

According to a first aspect of the present invention, a plurality of monitor requests generated from a multi-window type monitor device, a networked monitor device or the like at arbitrary timings are stored in a monitor request storage means in a programmable controller,
In response to the execution monitor requests of the programs having the overlapping monitor request ranges, the monitor execution instructing means generates an execution monitor request of one program, and the monitor data collecting means stores the program execution states of a plurality of monitor ranges as monitor data. This makes it possible to simultaneously process execution monitors of programs over a plurality of ranges.

According to a second aspect of the present invention, when the sequence operation CPU reads and executes the sequence program stored in the program memory in the programmable controller, the monitor execution instructing means sets the execution address of the sequence program to the monitor. When the monitor start address and the monitor stop address stored in the request storage means are matched, the monitor execution request flag is set and reset, respectively, and when at least one monitor execution request flag is set, the one program is executed. A monitor request is generated, and the monitor data collection means collects monitor data for monitoring the execution state of the sequence program in response to the execution monitor request, and when it is within the monitor range, the sequence program for a plurality of monitor requests Execution status Stored in the monitor data memory,
It is possible to accept a plurality of monitor requests having overlapping monitor ranges or a plurality of monitor requests having different monitor ranges.

According to the third aspect of the invention, when the monitor data of the execution state of the sequence program is sampled, the monitor data of the overlapping monitor range is simultaneously sampled by the information stored in the monitor request register, and the monitor data is stored in the monitor data memory. Store.

According to a fourth aspect of the present invention, when the monitor data is sampled, the monitor data is extracted from the monitor data by attaching the program address of the monitor start point to the monitor data and storing it in the monitor data memory. In addition, the attached program address can be used as a clue to extract the monitor data in the necessary monitor range, and the monitor data in a plurality of monitor ranges can be selected from the contents of the single monitor data.

According to a fifth aspect of the present invention, when the monitor data is sampled, a sequence circuit number from the monitor start point is added to the monitor data and stored in the monitor data memory. When taking out, the attached sequence circuit number makes it possible to take out monitor data in a necessary monitor range, and it becomes possible to easily select a plurality of monitor data from the contents of a single monitor data.

[0017]

FIG. 1 shows an embodiment of the programmable controller of the present invention. In FIG. 1, the programmable controller includes a monitor interface (I / F) 11 for connecting the monitor devices 12A to 12N, executes data transmission / reception with the monitor device, and processes a monitor data request. A CPU 1, a system memory 3, a sequence program memory 4, a sequence operation CPU 5 that executes a sequence instruction, and a monitor address range register 6 that stores a monitor start / stop request address from a monitor device are connected to the CPU bus 2. An address comparison circuit 7 that combines the addresses of the sequence program to be executed by the sequence operation CPU 5 with each address in the monitor address range register 6 to generate a monitor start signal and a stop signal, and a monitor start / stop request. Is stored in the monitor request register 8 and the monitor request register 8 A data monitor circuit 9 for collecting the execution state of the sequence operation in accordance with the monitor execution command, and a monitor data memory 10 for storing the monitor data are configured. Monitor device 12
A to 12N execute program execution monitor, data monitor, etc.

FIG. 2 shows an example of the execution monitor by the three monitor devices 12A, 12B, 12C. The program range indicated by 12A, 12B, 12C is the monitor device 12A, 12B, 12C.
The monitor request range of the sequence program by C is shown. The monitor request ranges of the monitor devices 12A and 12B partially overlap, and the monitor request range of the monitor device 12C exists in an area discontinuous with the monitor request range of the monitor devices 12A and 12B. The PC must collect monitor data in response to these requests.

When the CPU 1 receives the monitor request output from the monitor devices 12A, 12B, 12C, it stores the data in the monitor address range register 6. The monitor request includes a monitor start address and a monitor stop address, and the monitor address range register 6 stores registers 6a to 6n for storing a plurality of monitor requests 1 to n, as shown in FIG.
The address comparison circuit 7 has these registers 6a ...
A plurality of address comparison circuits 7a to 7n corresponding to 6n are provided. These have a set corresponding to the maximum number of monitor requests. The address comparison circuit 7 compares the execution address that the sequence operation CPU 5 is going to execute with all the requested monitor start addresses and monitor stop addresses, and when the addresses match, the monitor start signals MON1 to MONn and monitor stop, respectively. Signal MOFF1 to MOFF
Generate n and give it to monitor request register 8.

As shown in FIG. 4, the monitor request register 8 is a register 8a for setting and resetting the monitor execution request flags MRF1 to MRFn by the monitor start signals MON1 to MONn and the monitor stop signals MOFF1 to MOFFn.
8n and the monitor execution request flags MRF1 to MRFn output from these registers are ORed to output one monitor execution request signal MDSR, and an OR circuit 8R is provided. For example, the monitor execution request signal MDSR is output.

When the monitor execution request signal MDSR is output,
The data monitor circuit 9 collects monitor data. That is, the data monitor circuit 9 collects execution outputs, bit operands, and word operands according to the execution state of the sequence operation CPU 5 and stores them in the monitor data memory 10, and also the monitor start signal or monitor stop signal from the address comparison circuit 7. When is output, the monitor start address or monitor stop address is read from the monitor address range register 6 and stored together with the monitor data.

As shown in FIG. 5, the monitor data memory 10 is provided with a data storage area such as a data content tag area, an execution output area, a bit operand area, and a word pellet area. Monitor data is stored in the data content tag area. Data for identifying whether it is bit data or word data is stored, the sequence output data is stored in the execution output area, and the contact when the sequence instruction is a contact instruction or coil instruction in the bit operand area,
Data for identifying the state of the coil is stored, and in the word operand area, data for identifying what the word data area is, an operand, a monitor start address, a monitor stop address, or a circuit number.

When there is a monitor request, the contents of the monitor data memory 10 are initialized every time one scan of all sequence programs is executed. As mentioned above,
The PC of this embodiment can simultaneously process monitor requests from a plurality of monitor devices having different ranges.

As shown in FIG. 2, the monitor request from the monitor device may cover a plurality of ranges, and either request may occur or disappear. Therefore, the PC must determine whether or not there is a monitor request for the execution address each time the sequence program is scanned, but in the PC of the present embodiment, the contents of the register 6 in the monitor address range and the sequence operation CPU 5 are determined. By constantly comparing the execution addresses, it is possible to collect a plurality of monitor data during the execution of one scan.

Further, the monitor request from the monitor device is shown in FIG.
As shown in, the monitor ranges may overlap, and it is necessary to prevent the monitor data of the overlapping monitor ranges from being redundantly stored in the monitor data memory 10. In the PC of this embodiment, as shown in FIG.
Monitor execution request signal MDSR by integrating multiple monitor requests
Since it is created, it is possible to collect the monitor data of the overlapping monitor range at one time and output it to the data monitor circuit 9.

Further, in the PC of the present embodiment, monitor data integrated with the monitor requests from a plurality of monitor devices is created, so that the monitor range requested by the device itself from the monitor data on the monitor device side. It is necessary to retrieve the monitor data of. For this reason, the PC of this embodiment stores the monitor start and monitor stop addresses in the monitor data at the same time. In addition, the monitor data can be discriminated whether the monitor data indicates operand data or address data. A data content tag area is provided in the memory 10.

Data monitoring is usually performed in sequence circuit units. It is convenient that monitor data is created in sequence circuit units also for monitor display. Therefore, as shown in FIG. 6, it is effective to provide a sequence circuit counter 13 and store the count value in the monitor data memory 10 every time the count value is updated. At this time, information indicating that the data content is the sequence circuit number is stored in the data content tag area. The sequence circuit counter 13 decodes the instruction code fetched from the sequence program memory 4 by the sequence operation CPU 5, and when the instruction (load instruction) at the beginning of the sequence circuit is detected, the count value is incremented and at the same time the data monitor circuit
Configure to output monitor request signal to 9.

[0028]

According to the programmable controller of the present invention, it becomes possible to simultaneously process a plurality of monitor requests having different monitor ranges and a plurality of monitor requests having overlapping monitor ranges while executing one scan of the sequence program. It is possible to provide monitor information with real time. Further, by storing the monitor start address, the monitor stop address, and the sequence circuit number together in the monitor data, the monitor device can easily retrieve the data in the monitor range requested by the monitor device from the monitor data. It will be possible.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing an embodiment of a programmable controller corresponding to claims 1 to 5 of the present invention.

FIG. 2 is a diagram showing a monitor range of a plurality of monitor requests for a sequence program.

FIG. 3 is a detailed configuration diagram of a monitor range address register 6 and an address comparison circuit 7.

FIG. 4 is a detailed configuration diagram of the monitor request register 8.

FIG. 5 is a detailed configuration diagram of the monitor data memory 10.

FIG. 6 is a configuration diagram showing an embodiment of a programmable controller corresponding to claim 6 of the present invention.

[Explanation of symbols]

1 ... CPU 2 ... CPU bus 3 ... System memory 4 ... Sequence program memory 5 ... Sequence operation CPU 6 ... Monitor address range register 7 ... Address comparison circuit 8 ... Monitor request register 9 ... Data monitor circuit 10 ... Monitor data memory 11 ... Monitor Interface 12… Monitor device 12A to 12C… Monitor range 13… Sequence circuit counter

Claims (5)

(57) [Claims] 1. A monitor request storage means for storing a plurality of monitor requests generated from a monitor device, and a program in which monitor request ranges overlap from the stored plurality of monitor requests .
A monitoring execution instruction means for generating an execution monitor requests a program for the execution monitor request, the monitoring data acquisition means for collecting data for a plurality of monitoring requests by the generated pro <br/> grams of execution monitor request A programmable controller characterized by being provided. 2. The programmable controller according to claim 1, wherein the monitor request includes a monitor start address and a monitor stop address, and the monitor request storage means stores the monitor start address and the monitor stop address for each monitor request. The monitor execution instruction means includes a plurality of registers for storing, and when the sequence calculation CPU executes the sequence program, when the execution address of the sequence program matches the monitor start address and the monitor stop address, the monitor execution instruction means executes the monitor respectively. A means for setting and resetting a request flag, and generating an execution monitor request for the one program when at least one monitor execution request flag is set,
The monitor data collection means includes a data monitor circuit that collects monitor data for monitoring the execution state of the sequence program in response to the execution monitor request, and a monitor data memory that stores the monitor data. A programmable controller characterized by storing the execution state of a sequence program for a plurality of monitor requests in a monitor data memory at one time. 3. The programmable controller according to claim 2, wherein information on a plurality of registers for storing a plurality of monitor requests is used to detect that the monitor requests are duplicated at the execution address of interest of the sequence program. A programmable controller characterized in that 4. The programmable controller according to claim 2, wherein the monitor data collection means attaches the program addresses of the monitor start point and the monitor stop point to the collected monitor data and stores the monitor data in the monitor data memory. Characteristic programmable controller. 5. The programmable controller according to claim 2, wherein the monitor data collection means adds a sequence circuit number from a monitor start point to the collected monitor data and stores the monitor data in the monitor data memory. Programmable controller.