JPS5935041B2 - Timer command control method in step-by-step sequence controller - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a control method related to a timer instruction in a step decimal sequence controller of a store program type.

Regarding recent step-by-step sequence controllers,
The commands for each process unit consist of output control commands that indicate whether to turn each output on or off during the execution period of that process, and process update commands that indicate the conditions and operation details for proceeding with the process. The instructions for each process stored in the storage section are sequentially executed by the arithmetic control section.

Further, the process update instruction is composed of an instruction code indicating the type of processing operation in Table 20, and modification data that modifies this instruction code to embody the content of the processing operation, and the data length and length of these instruction codes and modification data. Of course, the allocated areas in the storage section are determined.

For example, in the case of an AND instruction that proceeds to the next step when the logical product (AND) of 25 signals from two specified input terminals is established, the instruction code area will contain a specific code representing the AND instruction, and the above-mentioned modification The data area contains two input terminal numbers to be ANDed. Further, in the case of a timer instruction for proceeding to the next 30 steps after a specified time, a code representing the timer instruction is entered in the instruction code area, and time data is entered in the modification data area. In some conventional sequence controllers, the modification data consists of a 4-digit binary coded decimal code.35 In the case of the above timer command, the 4-digit modification data can be used to change the time from a minimum of 00 minutes 01 seconds to a maximum of 59 minutes 59 seconds (or The timer time can be arbitrarily set within the range (up to 99 minutes and 99 seconds).

In this case, since the unit of time data is fixed, the user can easily and easily You can read the set time without any trouble. However, the time range that can be set is very narrow for a sequence controller, and there is a problem that it cannot meet the needs of a wide range of users. This invention was made in view of the above problem, and is a method for setting the time for a timer command using 4-digit binary-coded decimal code modification data, and counting time based on the 4-digit binary coded decimal code modification data. By including data representing the smallest unit in the data, the processable time range is greatly expanded, and when time data is displayed on a 4-digit numerical display, the unit can be easily read. This provides a timer command control method.

Hereinafter, one embodiment of the present invention will be described in detail based on the drawings. First, the outline of the configuration of the sequence controller will be explained according to FIG.

This type of sequence controller includes a central processing unit 2 that is configured with a so-called microcomputer that is made into firmware, and an input circuit 3 that is an input interface between the central processing unit 2 and an external contact connected to an input terminal 1N. and an output circuit 4 that controls an external device connected to the output terminal 0UT in accordance with an output signal from the central processing unit 2.
A program memory 5 that stores sequence programs arbitrarily set by the user, a key input device 6 used when setting programs, etc., and a display that displays the commands being set when setting the program and the commands being executed when executing the program. It is equipped with 7 etc. User commands for each process unit in this sequence controller are configured in the format shown in the table below.

The instruction code “0P” is 4 bits, and the modification data “DAT
A-1” and “DAT812” are each 8 bits (
It is a 2-digit binary coded decimal code, and the modification data as a whole is a 4-digit binary coded decimal code).

Further, the output control command "0UT" is data having the same number of bits as the number of output terminals in one-to-one correspondence with each output terminal (representing ON and OFF of each output terminal, respectively). As shown in Figure 2, the process number (step number)
A two-digit numerical display 71 that displays the instruction code “0P
]; a one-digit number display 72 that converts and displays decimal;
A total of four digit numerical displays 73 and 74 are provided to display modification data [DATA-1] and "DATA-2".

Note that these numerical displays can also display points. Next, general instruction codes and their execution contents in this sequence controller will be briefly explained.

(a) "NOP": Non-operation command Proceed to the next step without doing anything.

(b) “END”; End command This indicates that one cycle of processing has been completed.

(c) "JMP"; Jumps to the step specified in the jump-up command "DATA-1" and continues execution from there.

(4) "AND": When the two inputs specified in the AND command "DATA-1" and "DATA-2" are complete, proceed to the next step.

(c) [0R]: Receive the signal that comes first among the inputs specified for the OR commands "DATA-1" and "DATA-2" and proceed to the next step.

(f) [CNT]: Counts the number of signals from the input specified as “DATA-2” by the number specified in the count instruction “DATA-1”, and when the count is up, proceeds to the next step.

(g) “CJP”; Conditional jump command “
DATA-2] If the input specified for
A-1", and if it is 0FF, proceed to the next step. (5) "RPT": Repeats the step from the step specified in "DATA-2" to the current step up to the number of times specified in the repeat command "DATA-1".

(1) "TIM": When the time specified in the timer commands "DATA-1" and "DATA-2" has elapsed, proceed to the next step.

FIG. 3 is a flowchart showing the basic operating procedure of the central processing unit 2 defined by the system program stored in the ROM in the central processing unit 2, and particularly shows the operation of the timer command control according to the present invention. . To explain this flowchart, first, an initializer routine (routine 1) is executed, and in routine 2, the user command of the first step number is read from the memory 5 into the RAM in the central processing unit 2. In routine 3, the above-mentioned output control command "0UT" of the read user command is transmitted to the output circuit 4, and the output state set by the user command is output from the output terminal 0UT.In routine 4, the read user command is transmitted to the output circuit 4. It is displayed on the display 7 together with the step number.Now, by the display routine 4, the modification data "DATA-1" and "
"DATA-2" are displayed on the displays 73 and 74, respectively, but at that time, if the data of each digit of the modification data is "0000" to [1001], these data are of course converted into decimal numbers. Numbers "0" to "9" are displayed.2
For data [1010] to [1111] other than the above that are not defined as evolved decimal codes, that is, [A] to [F] in hexadecimal notation, a point "・" is displayed on the indicators 73 and 74. be done.

After the above display routine 4, in the next routine 5,
The instruction code [0P] of the user instruction read from the program memory 5 is decoded, and processing corresponding to each instruction code is executed.

Since the general instruction codes (a) to (5) and their processing are well known, their explanation will be omitted, and only the timer instruction processing (1) according to the present invention will be explained. For convenience of explanation, in the case of a timer instruction, the modification data is not handled separately into "DATA-1" and "DATA-2", but the time data "DATA-1" and "DATA-2" are treated as four-digit binary coded decimal code time data "
DATA”.

When the timer instruction code is detected in routine 5, the process moves to the timer instruction, and first in routine 6, the memory 5 is
It is checked whether all four digits of the time data "DATA" in the user command read into the RAM of the central processing unit 2 are "0".

In the initial state, "DATA" is not "0", but is determined to be NO, and the routine proceeds. In routine 7, the last third digit of the time data [DATA] in the RAM (i.e., "DA
It is checked whether the data of the lower digit of ``TA-1'' is ``1101'' = hexadecimal notation ``D''.

If YES is determined in routine 7, proceed to routine 8 and ignore the unit of the lowest digit of time data "DATA" as 1 minute, the unit of the second lowest digit as 10 minutes, and the third lowest digit as point data. Then, time counting is performed in the "hour mode" in which the unit of the most significant digit is 1 hour.
If it is determined that
Check whether the data of the upper digit of "A-2" is "1110" = hexadecimal notation "E". If YES is determined in routine 9, the process proceeds to routine 10 and the time data “D
ATA], the unit of the lowest digit is 0.1 seconds, the second lowest digit is ignored as point data, the third lowest digit is 1 second, and the highest digit is 10 seconds. A time count is taken. If NO is determined in routine 9, proceed to routine 11, and set the unit of the lowest digit of the time data "DATA" to 1 second, the unit of the second lowest digit to 10 seconds, the unit of the third lowest digit to 1 minute, etc. Time counting is performed in a "minute mode" in which the most significant digit is treated as 10 minutes.

The time counting routine 8 in the "hour mode" is executed by the central processing unit 2.
Check the timer register in ``Hour mode'', and if 1 minute, which is the minimum unit in ``hour mode'', has not elapsed, return to routine 3. If 1 minute has elapsed, check the timer register above.
The time data "DATA" in AM is subtracted by one unit and the process returns to routine 3. That is, routine 3→4→5→6
→7→8 are repeated at high speed, and the time data in RAM is
DATA'' is subtracted by 1 every minute (note that the point data in the last third digit is not treated as a numerical value), and the time data [DATA'' being subtracted is displayed on the display 7. Then, when the time data "DATA" becomes "O", it is determined as YES in routine 6, the process number is incremented by 1 in routine 12, and the process returns to routine 2. This completes the processing of the timer instruction, and the next The process has proceeded.In addition, in this "hour mode", a point "・" is displayed in the lower digits of the display 73.This indicates that the user is in the hour mode, that is, the unit of the smallest digit of the time display. It can be understood that is 1 minute. In addition, in the hour mode, the point display is blinked in units of one second to inform the user of the passage of time. The time counting routine 11 in the "minute mode" has the same processing principle as the routine 8 described above, but differs in that the time data [DATA] is decremented every second.

In this "minute mode", there is no point display on any of the digits of the displays 73, 74, so that the user knows that the unit of the smallest digit of the time display is one second. “Seconds mode”
Similarly, the time counting routine 10 in this case decrements the time data "DATA" every 0.1 seconds.

In this second mode 7, the point “
" is displayed. This lets the user know that the minimum digit of the time display is 0.1 seconds. As explained in detail above, according to the timer command control method according to the present invention,
When expressing and controlling the time of a timer command using modified data consisting of a 4-digit binary coded decimal code, the unit of time data can be changed to three levels, which allows for a minimum of 0.1 seconds to a maximum of 9 hours. It can handle a very wide time range up to 59 minutes (it's hard to understand, but if you dare to allow it, up to 9 hours and 99 minutes).

Moreover, the unit of time data can be easily distinguished depending on whether a point is included in the time display, and if so, whether it is the second or third digit, which is extremely practical.

[Brief explanation of drawings]

Fig. 1 is a block diagram showing a schematic configuration of a sequence controller to which the present invention is applied, Fig. 2 is a detailed view of the display 7 of the same controller, and Fig. 3 mainly shows a timer instruction control method according to the present invention. 3 is a flowchart showing the operating procedure of the central processing unit. 2...Central control unit, 5...Program memory, 7...Display device.

Claims (1)

[Claims] 1 A process update instruction stored in the program storage unit is composed of an instruction code representing the type of processing operation, and modification data that modifies this instruction code to embody the processing operation, and the modification data is a four-digit number. In a stored program type step-by-step sequence controller that is expressed in a binary coded decimal code and has a numeric display with a four-digit point for displaying this modification data, the time represented by the modification data When executing a timer instruction to advance the process after counting, each digit of the modification data is converted to decimal and displayed on the numeric display, and "
If specific data of 1010 or more is included, a point will be displayed at the corresponding digit position on the numeric display, and if the specific data is included in the last third digit of the modification data, the minimum unit of the modification data will be displayed. The time is counted as 1 minute, and if the specific data is not included in the modified data, the minimum unit of the modified data is 1 second, and the specific data is in the second last digit of the modified data. A timer instruction control method in a step-by-step sequence controller, characterized in that when the modification data is included, the time counting is performed with the minimum unit of the modification data being 0.1 seconds.