JPS6039203A - Programmable controller - Google Patents

Abstract

PURPOSE:To attain the best condition control and process step control by providing separately a memory area storing a condition control program and a process step control program so as to attain distinct separation on a program even if any special instruction system is not used. CONSTITUTION:A system program is stored in an ROM1 and a system work area or the like is provided to an RAM2. Further, a user's program is stored in an RAM3, one condition control block and two process step control blocks are provided. An input data from a user system device is fetched to a CPU6 via an input port 5 from an input terminal 9 and an output signal is outputted to an output relay 8 and a state display lamp 12 from an output port 7. Then the input of the program and the input of the operating command from the operator to a program controller PC are executed by an input key 10, and the content of the inputted program, the process of execution, an input data, the content of the output relay and an error message or the like are displayed on a program display 11.

Description

Detailed Description of the Invention (Al Technical Field This invention relates to a programmable controller that can selectively execute a program of a conditional control method and a program of a two-culm stepping control method. When viewed from the control force formula, controllers (hereinafter referred to as "car C") can be broadly classified into the following two types. This is a step-by-step control type PC that continuously executes this process according to a predetermined procedure, and the other one constantly monitors the input contacts of the entire controlled object. This is a conditional control type PC that constantly reflects the results of human logical calculations in the output and executes control in parallel and with instantaneous response.
Since programs can be created according to the flow of the operation, it has the advantage of being easy to think about and can be handled easily even by inexperienced people.However, on the other hand, operations other than the flow, that is, interrupt fishing operations, can be handled using specific command words. However, it has the disadvantage of being insufficiently functional. In addition, since the latter performs condition determination cyclically, it has the advantage of being able to adequately handle interrupt fishing operations.
Since control is performed while simultaneously performing one constant in parallel, the flow of control cannot be directly expressed in a program, and there is a disadvantage that some experience is required to modify the program. Therefore, in general, a PC having one of the control functions is used depending on the purpose or the ability of the operator. However, in PCs that only have the control function of either process step control or condition control, both
Two types of control objects are required,
In addition, when changing from the process path IT; 111a11 method to the condition jlH control method, or from the condition control method to the process step control method, it is inconvenient that a different type of PC must be prepared each time the change is made. There is.

In order to solve this problem, we have conventionally provided two types of control functions, stepwise control and conditional control, and are capable of executing one control force formula according to the user's selection.
) C was put into practical use. For example, JP-A-57-69
Proposed in No. 308 a) A PC is a single user
The program memory can be divided into a condition control program storage area ~r and a process step l1l (li control program storage area, so that the process step control program can be executed while the condition control program is being executed, so that one I)
C allows two types of In control methods to be executed in parallel.

However, most conventional PCs equipped with two types of functions divide one program memory into sections, as disclosed in the above-mentioned Japanese Patent Laid-Open No. 57-69308.
Since the configuration allows the process step control program to be incorporated into the control program according to the user's settings, a special command system is required to distinguish between the condition control program and the process step control program. Moreover, the control to distinguish between them becomes complicated, and it is necessary to set two types of control programs for one memory (↓1), which makes the program setting work complicated and has very poor operability. was there.

(C1 Purpose of the Invention The purpose of the present invention is to separate the memory areas for storing the conditional control program and the two-step step control program, so that they can be clearly separated on the program without using a special instruction system. A programmable controller that simplifies control and program setting operations, and allows easy communication between the block that stores condition control programs and the block that stores process step control programs using internal relays. Our goal is to provide the following.

1d1 Structure of the Invention To summarize, the present invention includes a condition control program storage block that stores only a group of instructions for controlling conditions, and a fall program storage block on the process step side that stores only a group of instructions for controlling process steps. They are configured separately, and an internal relay for communication is provided between each memory block, and after one round of execution of the condition control program, the execution of the process step control program is started.
Furthermore, after executing the process step progress control program one step, the execution of the condition control program is started. can be carried out in parallel, and arbitrary data can be sent and received between each storage block using an internal relay for communication.

TELE EMBODIMENT FIG. 1 is a schematic block diagram of a PC which is an embodiment of the present invention. ROM 1 stores the system programmer 12,
RAM2 stores the system work area and the like by α1f. R
A M3 stores the user program, and has one condition control block and two process step control blocks as described below.
Comes with a cook. Input data from the knee system equipment is input to CP t via input port 5 via input terminal 9.
J6, and the output signal is outputted to output relays 8, 1, and status display lamp 12 from output capacitors 1-7. Program input from the operator to the PC is performed using the input key 1O, and the contents of the input program, the running data, the output relay contents, error messages, etc. are displayed on the program display If. Is displayed. Note that 4 indicates a hardware block such as a timer and a cassette interface.

FIG. 2 is a schematic front view of the front panel of the PC.

Hitokaki-10 has almost the same configuration as the input key of Tsutomi's PC, and is used for setting and reading programs, etc.
The display contents on the display 11 and the settings using the input keys 10 can be made for each block using the block keys 10a. FIG. 3 (Δ) to (I)) show examples of displays on the display 11 for each mode set by the block key 10a. The same figure (A) shows an example of the display of the setting contents of one step in the block in which the process step control program is stored, and the same figure (B) shows the display example of the setting contents of one step in the block B in which the other process step control programs are stored. An example of displaying the settings for one step is shown below. In addition, (C) in the same figure shows an example of displaying the setting contents of one step of block C in which the condition control program is stored, and (D) in the same figure shows the output setting or monitoring of the output state in the display mode for the block. An example of the display when specified is shown. In the display example of the figure, for example, in the block A display of FIG. 3(A), the block name is displayed in the display area a, and the step teeth are displayed in the display area A. Further, commands are displayed in the display area C, and input/output settings or numerical data are displayed in the display areas d and e. Further, in the block C display mode of FIG. 3(C), the block name is displayed in the display area a, and the step teeth are displayed in the display area A. Further, commands are displayed in the display area C, and number data are displayed in the display area d. Furthermore, Figure 3 (D>
In this mode, the block name is displayed in display area a, and the step teeth are displayed in display area A. Further, the display area C displays the output positive, and the display area d displays the output setting state or output state. Figure 3 (D
), each display position of the 8 bits in the display area d can be specified with the cursor e, and any bit (output position) can be specified by using the keys 10b and lOc for cursor movement and the ON key 10d for data setting. can be set on. In the display modes shown in FIGS. 3(A>, (B) and (D)), the second digit data in the display area represents the subtemplate used in the process step control program.

As mentioned above, in this embodiment, block key 1 (la
Since commands and the like are displayed for each block by switching the display, there is an advantage that the display can be made smaller. Furthermore, since the step number, command word, and numerical data (number data) are displayed in series on one display, it is very easy to see, and has the advantage that program setting and confirmation are extremely easy.

FIG. 4 is a diagram conceptually showing the memory structure of the RAM 3 that stores user programs.

As mentioned above, the user program is stored in each of blocks A, B, and C separately and in sequence in this example.

Different types of process step control programs are stored in blocks A and H, and a condition control program is stored in block C. Communication between each block consists of one register. internal relays (hereinafter referred to as communication 11'?) 20 to 22 are connected,
For each communication IR, ζ can set or read data according to instructions stored in each block. Data can be set in the communication IR2O by block A, in the communication IR21 by block B, and in the communication IR22 by block C.

Furthermore, the data set in the communication lR2O, 21 can be read by block A or block B, and can also be read by block C. Furthermore, the data set in the communication IR 22 can be read out by block C, and can also be read out by block A or block B without increasing the temperature. Each communication IR is composed of one to multiple pieces, and if it is composed of multiple pieces, relay N1 is provided for each communication IR.
is given (=J.

Block C includes an IR for operation control in addition to the IR22 for communication.
23 are connected. This operation control IR'23 is used to control the process progress control programs stored in block A and block B. The operation of this operation control IR 23 will be described later.

FIG. 5 is a diagram showing an example of programs stored in blocks A to C. (A) shows an example of a process step control program stored in block 8, and 1i
iJ Figure 1 (B) is written in Block-H 1. An example of a process progress control program is shown below. Further, (C) in the same figure shows an example of a program for controlling the conditions stored in block C; lr+J.

The commands used are the same as those used for the PC dedicated to process progress II11i111 and the PC dedicated to condition control. There are no other special instructions. FIG. 6(A) shows the types of instructions used in each of blocks A, B, and C. In addition, communication IR2 (
For setting data to 1 to 22 and reading the data, a predetermined one of the above instructions is used. FIG. 6 (r3) shows instructions regarding the communication IR. For example, use the SET command to set data to the communication I R2 (+ by using block 8).
Use commands such as R. In FIG. 5, the data written in the operand column and the number column are input/output numbers, etc.

FIG. 7 is a diagram showing the allocation of the operation control IR 23 described in section 2. 11223 for motion control fall is Pro Tsuk A
Six blocks are allocated for each block I3 and Flock I3. Each motion control JR is used for its own motion control. For example, the operation control IRs numbered 100 and 110 are used for recent control;
IR numbers 1 and 114 are used for star I/control. )) Figure &j Above glue J ('l' I for ilX control
FIG. 3 is a diagram illustrating a procedure for starting the programs of block A and block I3 using R; Same figure (Δ
) is a relay symbol diagram for the star 1~control, and the same figure (1"3) is a diagram showing a command group. To simply explain the operation of the section, first, at step O, the normal Low 1 is applied to IR number 121, and outputted to operation control IR number 100 in step 1.12
Since the first IR is set to 0 at startup,
At the stage when Step Knob 1 is executed, operation control α1j I
RI number 00 is set. Similarly, step 2
Also, TRll0 number for the active side fBll is set.

Next, in step 3, change the normal IR of number 120 to o −
1;' L, normal ・I in step 4]? 1
Output to number 21. The normal IR of number 120 is 0 at startup.
Therefore, when step 4 is executed, the IR number 121 is set to Seno 1. Next, in step 5, load IR number 121, and in step 6.7
It is output to operation control lRs 104 and 114. As a result, each time the operation control lRs 104 and 114 are set. In addition, since IR number 121 is set in the next cycle,
In steps 1 and 2, the operating side falls JI I R
Numbers 100 and 110 are never set.

By using the operation control IR in this way, block C can control the operations of programs A and B without using any external input terminals. In this case, as is clear from FIG. 8, the operation control IRs used to start the programs of blocks A and H are numbers 100, 110, and
114, and no other operation control IRs are used. Therefore, there is an advantage that control is extremely simple and programming is extremely easy. Also, Fig. 9 shows the external input terminals 1 to 4 and the operation jlil control I Rl (]
No. O, No. 104, 1. l (Figure 1 (A) in the same figure) and a diagram showing the command group (Figure (B) )).The operation in this case is that after starting operation, if inputs 1 to 4 are off, the
However, when the input I is turned on, I RL is activated by executing the block program.
Since the number O0 is turned on, the process of adding cents to the block is performed. Next, when input 1 is turned off and input 2 is turned on, program A is started and the process step process is executed. The operation is similar for block B as well. In this way, it is possible to start blocks A and B by making the external input terminal correspond to the operation control IR, which has the advantage of requiring only the minimum necessary program, and furthermore, the number of external input terminals used is also minimal. There are limited benefits.

FIG. 10 is a flowchart showing the general operation of the PC.

First, in step nl (hereinafter, step ni is simply referred to as ni), when the power is turned on, initial processing is performed. Then n
If the operation switch 30 (see FIG. 2) is on at step 2, initial processing for the operation start position is performed at step n3. Furthermore, it is determined whether the memory is in the front with n4, and if it is positive, n
In step 5, the instructions in the block diagram of °ζ block C are checked. If the step of the program to be executed is not an END instruction written in the final step, n7
One instruction word (one step) is executed. Furthermore, the program counter is updated (n8) and the process returns to n5.

In this way, the program of block C goes around, and E N l
) When the instruction is detected, the process proceeds from n6 to n9, and all input data is taken in from the input capo-1.Furthermore, at nlO, the operation results of the programs of blocks A, +3, and C are output to the output port. In this state, if the IR for controlling the operation of the block is set, the block is controlled (n 12
), if not, the step condition of Boocock A is determined and the step is executed. Note that the execution steps of the program in block A are monitored by a program counter (not shown).Next, in steps n1.4 to n16, block B is processed in the same manner as steps r111 to n13 in section 2, and in n17. Operation switch 3
If 0 is on, the program counter is returned to the program start door of block C at n18, and the process returns to n5. If the memory is abnormal in n4, a memory error will be displayed and a buzzer will be sounded in n19, and after confirming that the recovery process has been completed in n20,
Return to 2. If the input key is pressed during execution, the process moves to interrupt processing and is executed at step n21. Further, since a timer interrupt is generated every 100 msec, clock processing such as a 1-second clock, buzzer-on control, monitor display, etc. is performed at n22 each time the interrupt occurs.

After going through the condition control program stored in block C as follows, block A is executed.

Steps of the process step control program stored in block B are executed, and after the execution is finished, execution of the conditional control program is started again.

13. Three types of programs stored in C can be executed in parallel.

(F1 Effects of the Invention As described above, according to the present invention, the condition control program storage block and the process step control program storage block are configured separately, and furthermore, an internal relay for communication is connected between each storage block. Since the blocks can communicate freely with each other, each program can be handled in the same way as a single-function PC, and data cannot be sent and received between blocks. Since it can be carried out simply and easily, both the capabilities of condition control and process step control can be exerted at the same time and in the best condition.

[Brief explanation of the drawing]

Figure 1 is a block diagram of a PC that is an embodiment of this invention, Figure 2 is a front panel diagram of the same PC, Figures 3 (A) to (I))
1 is a diagram illustrating an example of display by mode on the display 11. FIG. Furthermore, Fig. 4 shows a conceptual diagram of blocks allocated to RAM3 and internal relays for communication, and Fig. 5 (A) to (C)
) is a diagram showing an example of the program of each block, and Figure 6 (
8) is a diagram showing the command system used in each block, FIG. 6(B) is a diagram showing the command system regarding the communication IR, and FIG. Figures 8 (A) and (B) are diagrams showing relay symbols and instruction groups for starting programs in blocks A and B. Figures 9 (, A) and (B) are for starting programs using external terminals. It is a diagram showing a relay symbol diagram and a command group for performing control. FIG. 10 is a flowchart showing the general operation of the PC. Applicant Izumi Electric Co., Ltd. Agent Patent Attorney Hisao Komori Figure 1; Figure i'-3 Figure 4 Figure 5; Figure 6 (A) (B) Figure 7 Figure 8 (A) CB) Figure 9 Diagram (A) (B)

Claims (1)

[Claims] (1) Condition control program consisting only of a group of condition control instructions
A process step that stores a process step control program that is configured independently of the condition control program storage block and a group of instructions for process step control. A control program storage block, an internal relay for communication provided between each storage block and in which data is set or read in response to a predetermined command, and a process step control after one cycle of execution of the condition control program. A programmable controller 1-roller comprising: means for moving to execution of a program; and means for moving to execution of the conditional control program after executing the ``two step step control program'' one step.