JPH04109309A - Programmable controller - Google Patents

Abstract

PURPOSE:To improve an operation environment or the like by switching the validity and invalidity of a monitor display in each of plural program consoles by means of a user program and a user input. CONSTITUTION:When a program console A7 is connected to a CPU 1, the CPU 1 judges the contents of a program console A monitor switching memory, and when its logic is HIGH, i.e. its contact is ON, transfers monitor data to the console A7 through a console A interface circuit 5. When a program console B8 is connected, the CPU 1 similarly decides the contents of a program console B monitor switching memory, and when its logic is HIGH, i.e. its contact is ON, transfers the monitor data to the console B8 through a console B interface circuit 6. Thereby, each program console can display the monitor data only in a condition determined by a user.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a programmable controller that controls the sequence of equipment and monitors and displays the operating status on a program console.

Conventional technology In recent years, programmable controllers have expanded the range of objects they control, not only replacing conventional relays, counters, timers, and registers, but also controlling servo motors. The amount of information displayed has increased.

At the same time, the functions required of program consoles have diversified depending on the purpose of actual work, ranging from simply monitoring relay contacts to monitoring a wide range of detailed internal conditions of programmable controllers. There is also.

Conventionally, users have been able to monitor the operation of equipment by reconnecting these program consoles or displaying them continuously on multiple program consoles when necessary depending on the purpose of use. It was happening.

Problems to be Solved by the Invention However, conventional programmable controllers are configured as described above, so if an abnormal state occurs in the operation of equipment or the like and you want to immediately check the operating status of the sequencer, , multiple program consoles must be connected at all times, so that the screen on the program console is always displayed.

For this reason, for the operator of the equipment, displaying more information and operating the equipment more than necessary may make the operator feel uncomfortable or find it difficult to use the equipment. Furthermore, leaving the program console in the display state for a continuous period of time has the problem of shortening the lifespan of the electronic equipment used for display.

The present invention has been made in view of the above-mentioned problems, and provides a function that allows switching of program consoles to be displayed on a monitor during sequence processing of a user program.

Means for Solving the Problems In order to solve the above-mentioned problems, the present invention provides a dedicated relay for switching the program console monitor, and uses this relay to switch signals received from equipment and devices and the operating status inside the programmable controller. It is designed to select the program console to be displayed and to determine whether the display is valid or invalid.

Operation The present invention enables selection of a program console that performs monitor display using the signals of general relay coils and contacts in sequence processing by the above-described method, and realizes a programmable controller that is highly compatible with conventional sequence processing.

EXAMPLE Hereinafter, an example of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing the main configuration in an embodiment of the present invention. In FIG. 1, 1 is a CPU, 2 is a user program memory, 3 is a data memory for relays, 4 is an input circuit for inputting user signals, 5 is a program console interface circuit channel A, and 6 is a program console interface. Circuit channel B, 7 is program console A for monitor display, 8 is program console B for monitor display.
It is. FIG. 2(a) is a flowchart executed by the CPUI, FIG. 2(b) is a configuration diagram of a data memory, and FIG. 3 is a user ladder diagram for realizing the above functions.

The operation of the program controller configured as above will be explained.

In the programmable controller in which the user ladder program shown in FIG. 3 stored in the user memory 2 shown in FIG. , are stored in the program console A monitor switching memory 28 in the data memory 3. Similarly, CPUI
reads the signal of the user input contact 31 from the input circuit 4, the logic equivalent to the input signal logic is stored in the program console B monitor switching memory 29 in the data memory 3.
is memorized. Next, if program console A7 is connected, the CPUI
The contents of the monitor switching memory 28 are judged and the logic is HI.
In the case of GH, that is, the contact is ON, monitor data is transferred to the program console A7 via the console interface circuit A5. Similarly, if the program console B8 is connected, the CPU determines the contents of the program console B monitor switching memory 29, and if the logic is HIGH, that is, the contact is ON, the CPU selects the program console B8 via the console interface circuit B6. Transfer monitor data to. As a result, each program console is displayed on the monitor only under conditions determined by the user.

Next, the flowchart shown in FIG. 2 will be explained. The program console being executed imports data through console A code input processing 30 and console B input processing 31.

Next, a user program execution process 22 executes the user's program and updates the contents of the data memory 3. When execution of one scan of the user program is completed, a content determination 23 of the program console switching memory 28 in the data memory 3 is performed, and if it is ON, console A monitor screen processing 24 is executed. Next, a content determination 25 of the program console switching memory 29 in the data memory 3 is performed, and the ON state is determined.
If so, console B monitor screen processing 26 is executed.

Finally, the input/output process 27 is executed to update the contents of the data memory 3 regarding input/output, and the process returns to the original process.

Effects of the Invention As described above, the present invention includes a relay for switching program console monitors, and uses its contact signals to determine whether the monitor display is valid or invalid for each of a plurality of program consoles in the user program. This can be switched by user input, thereby improving the operating environment and stabilizing the display life of the program console.

[Brief explanation of drawings]

FIG. 1 is a main configuration diagram of an embodiment of the present invention, FIG. 2 is a flowchart and data structure diagram showing side procedures of a microcomputer, and FIG. 3 is a user ladder diagram for realizing the present invention. 1...CPU, 2...User memory,
3...Data memory, 4...Input circuit, 5...Program console/interface circuit channel A, 6...Program console/interface circuit channel B, 7...
...Program console A, 8...Program console 8.30...User input contact 1
0.31...User input contact point 11゜Name of agent Patent attorney Haruaki Ogata and 2 others Figure 1! Figure 2 (a) 3rd block

Claims (1)

[Claims] A user memory in which a user program is stored, an input circuit to which an external input is applied, an input means for reading the input signal, a data memory for storing the read input signal, and a function for editing the user program and monitoring the data memory. A programmable controller comprising an interface circuit for connecting a plurality of programmable consoles and a relay memory for switching program console monitors in the data memory, and , a programmable controller having means for enabling or disabling monitor display for each of a plurality of connected program consoles by changing the contents of a relay memory for console monitor switching in the data memory; .