JPS58158704A - Plc of time chart input system - Google Patents

Abstract

PURPOSE:To attain direct programming from a time chart, by using a CRT, preparing two display screens, inputting information in the procedure writing the time chart and completing the program of a sequence circuit. CONSTITUTION:The two kinds of display screens are prepared for the CRT. The 1st display screen is divided into three areas (a)-(c). An output address to be controlled is described on the (a). An ON-OFF control pattern corresponding to the output is written in the (b). A circuit number to input the interlock condition is inputted to the (c). The interlock circuit corresponding to the interlock circuit number is programmed on the 2nd screen. Then, the data inputted to the (a)-(c) are stored in an output table 1, an output pattern 2, and a step transfer table 3 respectively. The interlock circuit data is stored in an interlock condition table 4. The sequence control is performed based on the stored information.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a PLC programming method, and more particularly to a PLC that can be programmed directly from a time chart.

Most PLCs that use a CRT as a programmer are of the so-called ladder type, in which programming is performed based on a relay circuit.

The PLC of this machine is effective for sequence control mainly based on interlocks, but in control mainly based on step operations as typified by batch processes, the PLC of this machine is effective for sequence control operations expressed in a time chart by -1 relay. It is necessary to develop it into a circuit and program it. In other words, it becomes necessary to design a relay sequence circuit from a time chart. To solve these problems, the map method,
Alternatively, a decision table type PLC has been developed. However, all of these are developed and input into a sequence map or decision table.

1. It is limited to two-step operations that do not correspond one-to-one with the time chart, and cannot be applied to complex control.

& The interlock expression is unreasonable.

It had problems such as, and lacked versatility. 2. The purpose of the present invention is to realize a PLO that can be programmed by inputting the information written in the time chart as it is,
Inertial pressure DT that can be applied to complex control
ρru 1 Wenzhou ζ ÷ 1 si r 1 - Table 2 The present invention organizes the information written on the time chart, inputs this information in the steps of creating the time chart, and programs the sequence. The present invention relates to a PLC configuration that can flexibly respond to such program information.

An embodiment of the present invention will be described below.

/(The information expressed in the A chart is divided into: 1. Controlled output 2. ON-OFF control pattern in step & step transition operation 42 Interlock conditions for transitioning the steps. In other words, no matter how complicated the Even if the control is simple, there are four factors to consider: which output to control, at which step to turn 0N-OFF, from which step to which step to move from, and what interlock conditions should be met to make the step change at 9? The present invention is based on the display 1IIIi of the C-type T as shown in FIG.
Prepare a surface, and first input the output light controlled by a.

Next, the ON-OFF control pattern corresponding to these outputs is input to b. Next, the circuit number for inputting the interlock condition for transition from which step to which step is inputted to q. First, to input the output light, set the cursor d to the desired location and enter, for example, YOOI from the keyboard. Next, set the cursor mark d to the desired location in the same way as the control pattern, and press % from the keyboard. % g "Create the desired pattern by inputting the desired pattern.Next, move the cursor mark d to the desired position in the same way to move from step to step, and select any condition E from which step to which step.
If you press NO to indicate whether you want to shift, it will be 0, that is, the elements of items 1 to 3 above have been programmed. Next, specify the interlock circuit number and program the interlock circuit as shown in FIG. This can be achieved by using the same method as in a general ladder-type PLC. Fig. 3 shows an example of programming using a pool algebra formula. Figures 2 and 3 are general PL
FIG. 1 is a well-known C programming technique.

l#! The 9Lr# information inputted using the display screen of C and T shown in FIGS. 2 and 3 is programmed as shown in FIG. 4, and sequence control is performed. In other words, the data input at the cutting edge address a in Fig. 1 is transferred to the cutting edge address table l in Fig. 4, the data input manually at the output cover turn b is transferred to the output cover turntable 2, and the data input at step transition C is transferred to the output cover turn table 2. They are stored in the migration table 3, respectively. Further, the nine data inputted in FIGS. 2 and 3 are stored in the interlock condition table 4. These are memorized
A step counter 14 that manages steps based on fW rights and a conditional expression analyzer 12 that analyzes interlock conditions.
Sequence control is performed by the main monitor 11.

#I5 shows the operation flow of the main monitor 11. As shown in the figure, first, when resetting, the step counter 4 is returned to the first step (17, the first step is turned on based on the information of the output light table 1 and the output cover turntable 2).
-0FF output is derived (H). When the reset command is hot, the step transition table 3 is searched from the contents of the step counter 14 and the interlock circuit is extracted from the matching steps (B). Since the step transition table stores information such as from which step to which step and which circuit number, the contents of the step counter 14 indicate - 1.
From which step should we find "?" (C).Extracted circuit NO.

The conditional expression analyzer 12 is operated by. As a result, if the condition is satisfied h, the information of 1 is taken out to which step shown in the step transition table 3 and is set in the step counter 14 (E). Next, according to the steps indicated by the step counter, output optical Q, pull 1 and output turntable 2 are set.
The output is derived based on the information (F). In this way, it can be seen that the procedure for creating a time chart is based on the time chart, and the circuit can be programmed and operated.

According to the present invention, O'BT is used, two display screens are prepared, information is inputted in the procedure of writing a time chart, and at the same time, the glogs of the sequence circuit can be completed, and at the same time, it has a simple structure and is versatile. PLO can be realized.

[Brief explanation of the drawing]

FIG. 1 is an example of a CRT display for programming a time chart, FIGS. 2 and 3 are examples of a CRT display for programming an interlock circuit, and FIG. 4 is for a detailed explanation of the present invention. The block diagram of FIG. 5 is a block diagram of the PLCl of the present invention.
- Flowchart for explanation. DESCRIPTION OF SYMBOLS 1... Output light table, 2... Output turntable, 3... Step transition table, 4... Interlock condition table, 11... Main monitor, 12...
... Conditional expression analyzer, 13... Output trend, 14... Step kakunta.
-Static 4 layers

Claims (1)

[Claims] 1. Prepare two kinds of display screens as CRT display screens, divide them into three areas: the first display - Mengane, and
4I output terminal NO, and ON for the step
- By programming the OFF control pattern, step retrofit, and interlock circuit NO, and programming the interlock circuit corresponding to the interlock circuit NO on the i@2 display screen, you can program directly from the time chart. Time chart based on percentages. Manually operated PLC.