JPS6235906A - Sequence control method - Google Patents

Abstract

PURPOSE:To store parameters in optional positions by inserting the position, where parameters which a subroutine uses are stored, following the name of this subroutine. CONSTITUTION:In a sequence program, the start address of storage of parameters used by a timer number Ti is placed following a timer subroutine TMR and the parameter number Ti to constituted one function setting part 302. With respect to a counter subroutine CTR, the start address of storage of parameters is placed following a parameter number CTj similarly to constituted one function setting part 302. When it is checked that the function start condition is satisfied (RD ACT), parameters are read from the designated storage position to execute the function processing. Thus, any number of timers and counters are used as long as a memory has an idle area.

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a sequence control method, and particularly to a programmable machine controller (referred to as PMC device IT) disposed between an NC device and a machine tool. This article relates to a Kero sequence control method.

<Prior Art> In a numerical control system, each mechanical element of a machine is controlled based on commands from an NC device.

The transmission and reception of signals between the NC device and the machine tool is controlled based on a sequence program.

FIG. 3 is a block diagram of the NC device 1 using a sequence program, and 101 is an NC device in which NC data is punched.
tape, 102 a tape reader (other media and reading devices may be used), 103 an NC perforated NC tape;
RAM for storing data and other processing results; ROJ105 for storing control programs;
PU), 106 is the amount of movement X of each axis per predetermined time tV.

,Y.

A bus line 107 is a pulse distribution circuit that receives the input signal and executes a pulse distribution calculation. Further, 108 is a manual data input device (MDI device), 109 is an interface circuit, 110 is a parameter memory for storing various parameters, and 111 is an EROM (rewritable R
OM).

The storage areas of the parameter memory 110 are as shown in FIG. (C) A counter area 110c that stores parameters for a predetermined number (m) of counters; The size and position of each area are fixed.In other words, the size and position of each area are fixed. It is not possible to use a predetermined number of n or more timers, and likewise it is not possible to use a number of m or more counters.

In addition, EROMll0 stores the (al sequence program) and (b) the symbols and their logical values, which will be described later.
Correspondence table with memory location in M103, tel subroutine, [dl timer number i (i=1.2- ・n)
and (e) a correspondence table between the timer number and the storage location for storing the parameters used for the timer function processing, and (e) the counter number CTi (i=1.2. . . m) and the counter function processing for the counter number. A correspondence table and the like with storage locations for storing parameters to be used are stored.

The sequence program is a logical program of the functions of the high-power circuit that controls data exchange between the NC device 1 and the machine tool 2 using instruction codes and operands. is programmed as shown in FIG. In addition, the ladder width ○ is a coil,
11 indicates a relay contact. Also, RD, OR, AND, WRT, AN in one line in the sequence program.
D・NOT, OR-NOT... are each instruction codes, RD is a read instruction, AND is a logical product instruction, WRT is a write instruction, OR is a logical sum instruction, AND-NOT is a logical product instruction with a negative value, 0R-NOT
is an OR instruction with a negative value.

Also, MF, M28.・・AUT, MO3,・・・・
- CRA is an operand expressed as a symbol, and its logical value (1' or 'o') is stored in a predetermined bit at a predetermined location in the RAM 103).

By the instruction group of PRA part of this sequence program, MF-M28, M24, M22, M21, M2S, M
14.M12.Mll is executed, and the result of the operation is "'o") at a predetermined location in the RAM 103 corresponding to the operand MO3 accompanying the write command WRT. The address 2nd bit)
RAM 103 indicated by the operand spcw accompanied by
It is stored in a predetermined bit (5th bit of address 20) at a predetermined address. In addition, the correspondence table stored in EROMIII includes symbols MF, AUT, . . . and R, which are operands of sequence program instructions, as shown in FIG.
The correspondence with the storage location of those logical values in AM103 is shown, and the logical value of symbol AUT is 10 in RAM103.
The logical value of symbol MO3 is stored in the second bit of address 10, and similarly, the logical value of symbol MO3 is stored in the second bit of address 10.
The logical value of is stored in the second bit of address 42. Incidentally, the ladder diagram in FIG. 5 is accompanied by symbols and storage positions.

The examples shown in FIGS. 5 to 7 above are examples of sequence control based on logical operations such as AND and OR, but the sequence program also includes other functional processes such as timer processing, counter processing, decoding processing, magnitude comparison processing, Functional processing such as match determination processing can be performed.

FIG. 8 is a ladder diagram explaining such functional processing, and each ladder diagram for functional processing consists of a control condition setting section 201 and a function setting section 202 that specifies subroutines and parameters.
It is composed of Note that the control condition setting section is a section that sets various conditions necessary for executing the function processing (t: 1) and sets the function start condition, and only the function start condition is indicated by the symbol ACT.

FIG. 8 (Al is a ladder diagram for executing timer processing, f, l When there is an instruction to start clocking (content of the first bit at address 100, that is, ACT = ``1''), (bl subroutine TMRI The timer number Ti (i=1.2.
Find the parameter storage position indicated by n) from the correspondence table, read the parameters preset time Tp and previous clock time from the storage position, and calculate 1ΔL→
t (Δt is the time from the previous time to this time), and T
P-t checks whether, and if Ta≠t, t is stored in the parameter storage location, and if TP=t, 101
'1''' is stored in the first bit of the address.Furthermore, for each timer number, 5 addresses (address 1 is 1 byte) of parameter storage locations are used, 2 bytes of which are used for preset time storage, and other 2 bytes are used for storing time measurement, and the remaining 1 byte is used by the system.The sequence program for timer processing is RD 'ACT TMRTi (where i=1, 2. . . n) RT
It becomes Ti.

Figure 8 (CB) is a ladder diagram that executes counter processing, and when there is an instruction to start counting ta+ (when the content of the first bit at address 200, that is, ACT="1"), the (bl subroutine CTR returns the counter number CTj). Find the parameter storage location indicated by from the correspondence table, read the preset value Np that is a parameter and the actual count value N up to the previous time from the storage location, and calculate ), and checks whether it is NP-N, and if -7~N≠N, stores N in the parameter storage location,
If it is NP-N, store °°1'' in the 1st bit of address 201.Furthermore, for each counter number, 5 addresses (5 bytes) of parameter storage positions are used, and 2 bytes of these are used to store the preset value NP. The other two bytes are used to store the accumulated value N, and the remaining one byte is used by the system.

Also, the counter processing sequence program RD
ACT CTRCTj (j=1.2....m)WRT
It becomes CTj.

Now, the processing device 105 sequentially reads each instruction of the sequence program one by one, executes sequence processing from the first instruction to the last sequence program instruction name, and returns to the first sequence program instruction once the last instruction processing is completed. , thereafter, the sequence control is executed by repeating the processing of the sequence program commands cyclically and at high speed.

For example, if the spindle normal rotation command MO3 is commanded, Sympol MF, Ml 1. The logical value of Ml 2 should be stored in RAM.
IMI+ is stored in bit position 103 (1st bit of address 66 and 1st bit, 2nd pit of address 67...see Figures 5 to 7), and IMI+ is stored in bit position of RAM 103 (3rd bit of address 67). ~8th bit) II□I+ is stored.

Now, since the processing device 105 performs sequence processing by repeatedly reading out each instruction of the sequence program cyclically at high speed as described above, it executes the instructions of the PRA and FRB portions of the sequence program (Fig. 6). When the command is pressed, the 5th bit of address 20 of RAM 103 is written.
"1" is stored.Then, the contents of the 5th bit at address 20 (spcw-'1") are read out by another sequence program command and sent to the interface circuit 10.
9 to the machine tool 2. As a result, the machine w
The corresponding relay +2 is turned on, and the main shaft forward rotation control is executed. When the main shaft rotates in the normal direction, a main shaft normal rotation completion signal is generated from the machine 2, and the main shaft normal rotation completion signal is read through the interface circuit 109 according to a sequence program command and stored in a predetermined bit of the RAM 103. Thereafter, another sequence program process is continued, and the NC device 1 is notified of the completion of the main spindle normal rotation, and the sequence process for the main spindle normal rotation ends.

Furthermore, if the sequence program includes functional instructions such as timer function processing or counter function processing, the processing device 105 reads out each instruction of the sequence program cyclically at high speed, as described above. , since sequence processing is performed, someday TP=t or N
It becomes P-N and predetermined processing is performed thereafter.

<Problems to be solved by the invention> As mentioned above, the sequence program can not only process logical operations, but also
It is useful because it can perform functional processing.

Incidentally, in a conventional parameter memory, the size and position of storage areas 110a to 110e for storing each parameter are fixed. For this reason, even if it is desired to use n or more timers in a sequence program, it cannot be used, and even if it is desired to use m or more counters, it is impossible to use ζζ.

From the above, an object of the present invention is to provide a sequence control method in which the size and position of each storage area in a parameter memory for storing parameters can be varied, and as many timers or counters can be used as long as the parameters can be stored. be.

<Means for solving the problem> FIGS. 1(A) and 1(B) are ladder diagrams for explaining the sequence control of the present invention, and FIG. 1(A) is a ladder diagram for executing timer function processing. , (B) is a ladder diagram for executing counter function processing.

Reference numeral 301 denotes a $I control condition setting unit that sets conditions necessary for executing a function process and function start conditions, and the function start conditions are represented by the symbol ACT.

Reference numeral 302 denotes a function-11= setting unit for specifying subroutine names (TMR, CTR), parameter numbers (Ti, CTj, not necessarily required), and parameter storage locations.

In the case of timer processing, the sequence command for executing the functional process is RD ACT TM RT i ○○○ WRT 'Ti. Tat! ○○○ is an address indicating the first storage position of 5 bytes in which parameters used in timer number Ti are stored.

In addition, in the case of counter processing, it becomes RD ACT CTRCTj O○○ WRT CTj. However, ○○○ is an address indicating the first storage position of 5 bytes for storing parameters used in counter number CTj.

<Operation> An instruction (RD ACT) to check whether the function start condition is satisfied in the sequence program, and a subroutine name (TMR
, CT R) and the storage location in the parameter memory of the parameter used in the subroutine.

In step 1, the sequence program is started cyclically from the beginning.

If the function start condition is satisfied, the parameters used in the subroutine corresponding to the function are read from the specified storage location of the parameter memory.

Thereafter, the subroutine uses the parameters to perform functional processing.

In this way, the storage location where the parameter is stored is specified in the function processing sequence command, so the parameter can be stored at any location in the parameter memory.
Therefore, any number of timers and counters can be used as long as the parameters can be stored in the parameter memory.

<Example> FIGS. 1(A) and 1(B) are ladder diagrams for explaining the sequence system of the present invention, FIG. 1(A) is a ladder diagram for executing timer function processing, and FIG. ) is a ladder diagram for executing counter function processing.

Reference numeral 301 denotes a control condition setting unit that sets conditions necessary for executing functional processing and function start conditions, and the Plkl performance condition is represented by the symbol ACT.

Reference numeral 302 is a function setting unit that specifies the subroutine name 'TMR, CTRI, parameter number (not necessarily required for Ti, CTj), and parameter storage location.

In the case of timer processing, the sequence command for executing functional processing is RD ACT TM RT i W RT T i . However, QO○ is an address indicating the first storage position of 5 bytes for storing parameters used in timer number T1. Therefore, parameter memo IJII
If parameters are to be stored at addresses 300 to 304 of O (see FIG. 3), ○○○ will be 300.

In addition, in the case of counter processing, it becomes RD ACT CTRCTj ○○Q WRT CTj. However, ○00 is an address indicating the first storage position of 5 bytes for storing parameters used in counter number CTj.

Sequence control according to the present invention will be explained below. Note that the block diagram of the NC device shown in FIG. 3 can also be applied to the present invention.

Parameter 1 is sent in advance from the MDI device 108 (see Figure 3).
10 stores the necessary parameters. FIG. 2 is an external view of the MDI device for explaining the parameter setting method.

(Setting the al timer time The timer time is set by converting it to a value with 50ms e c as 1. For example, in the case of 13 seconds, 260 (=
]3000150), this 260 is converted to BCD, and the t: bit pattern 00000100 (=4) is stored in two addresses each consisting of 8 bits.

(If first, the MbI mode is selected using the mode selection switch provided on the operation panel (not shown) of the NC device 1.

(11) Next, MDI device “DGNO8” key 108
Press a to display the diagnosis screen on the CRT surface 108b.

After that, move the cursor to the diagnosis number position that is the same as the position (address) in the parameter memory 110 where you want to set the parameter.

Incidentally, the power/trail is the cursor movement key 108c.

This is done by operating 108d. That is, if you keep pressing the cursor movement key, the cursor will move one after the other, and if you move it across pages, the screen will change to the next page, so you can position the cursor at the desired diagnosis number.

Also, the QP key 108 can be used without using the cursor movement keys.
By pressing e, inputting the diagnosis nose number, and pressing the INPUT key 108f, the cursor can be positioned at the diagnosis nose number position.

After positioning the cursor 60, input the parameters you want to set using the data input key 108g.

If you press the INPUT key 108f after inputting the M parameter, the frame value set in ivl will be stored in parameter memory 1.
It is stored in the diagnostic nose number position of 10.

By repeating the above operations nine times later, the necessary number of timer-related parameters (timer times) are set in the parameter memory 110.

(Setting the preset value of the bl counter The preset value of the counter is BOD 5 digits (0 to 9999)
Set with . For example, the preset value 1234 is BOD
Since it is to be displayed using 5 digits, the first 8 bits (upper 2 digits) and the latter 8 bits (lower 2 digits) are each stored in one address. The setting method is the same as the timer time setting.

Additionally, sequence instructions for executing functional processing are inserted into the sequence program. Note that in the case of timer processing, it becomes RD ACT TMRTi O○○ W RT T i . However, ○○○ is an address indicating the first storage position of 5 bytes (address 5) in which parameters used in timer number Ti are stored.

Therefore, 3 of the parameter memory 110 (see FIG. 3)
If the parameters are stored at addresses 00 to 304, O○○ becomes 300.

In addition, in the case of counter processing, it becomes RD ACT CTRCTj ○○0 WRT CTj. However, O○○ is an address indicating the first storage position of 5 bytes (address 5) in which parameters used in counter number CTj are stored.

If sequence control is started in the above state, the processor 105 will cyclically execute the sequence program from the beginning.

Then, the control condition, in other words, the function start condition, is read by a read command (RD ACT), and it is checked whether the function start condition is satisfied.

If ACT-'"0°", no functional processing is performed (the next command is executed).

On the other hand, when the function start condition is satisfied, the subroutine (TMR or c
The parameters used in Te) are read from the address of the parameter memory 110 specified in the functional film Ube.

Thereafter, the subroutine (TMR or CTR) uses the parameters to perform conventional functional processing.

<Effects of the Invention> According to the present invention, since the storage location where parameters used during sequence commands for functional processing are stored is specified, any parameter can be stored at any location in the parameter memory. Therefore, any number of timers and counters can be used as long as the parameters can be stored in the parameter memory.

[Brief explanation of drawings]

Fig. 1 is a ladder diagram explaining the sequence control of the present invention, Fig. 2 is an external view of the MDI device to explain the parameter setting method, and Fig. 3 is a block diagram of the NC device using the sequence program. 20- Figure 4 is an explanatory diagram of the parameter area, and Figure 5 is a high-voltage circuit diagram (ladder diagram). FIG. 6 is an explanatory diagram of a sequence program, FIG. 7 is an explanatory diagram of a correspondence table, and FIG. 8 is a ladder diagram for conventional function processing. 103...RAM. 108=.MDI device, 109..Interface, 110..Parameter memory, 111..EROM, 301..Control condition setting section, 302..Function setting section

Claims (1)

[Claims] A sequence program includes an instruction to check whether a function start condition is satisfied, the name of a subroutine to be executed when the condition is satisfied, and the storage location of a parameter used in the subroutine in a parameter area. Insert it, and when the function start condition corresponding to the predetermined function processing is met,
A sequence control method, characterized in that parameters used in a subroutine corresponding to the function are read from the storage location, and the subroutine executes functional processing using the parameters.