JPS6323563B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a sequence control device with a numerical calculation function, and particularly to a sequence control device with a numerical calculation function suitable for high-speed sequence control.

Conventional sequence control devices with numerical calculation functions include methods in which everything is done using micro programs;
There is a method that does everything using hardware, but the former has the disadvantage of long processing times due to the microprogram, while the latter requires an enormous amount of hardware, making complex processing virtually impossible. It is.

An object of the present invention is to provide a sequence control device with a numerical calculation function that is inexpensive and capable of performing high-speed sequence control.

The present invention is a hybrid type in which sequence instructions with simple processing contents are processed by hardware and numerical calculation instructions with complex processing contents are processed by a micro program, and program numbers are managed to perform instruction processing in order. is done with a micro program,
When executing sequence instructions, the microprogram updates the program number to be executed next in parallel with the instruction execution processing by hardware, thereby speeding up the processing.

FIG. 1 shows an embodiment of the present invention. In this figure, 1 is a program memory in which a processing program is stored, 2 is an instruction import register, 3 is a sequence instruction execution unit that executes sequence instructions, and 4
5 is a jump address circuit that changes the flow of the micro program, that is, the processing; 5 is a timing circuit that organically moves the entire program; 7 is a micro address register that manages the address of the micro program; and 9 is a program that sets the address of the processing program. number register, 10 is a micro program processing circuit that executes a micro program;
Reference numeral 11 is an input/output unit that performs linkage with humans or processes.

The operation will be explained below. As shown in FIG. 2, an instruction capture process 21 and processes 22-1 to 22-n corresponding to the captured instructions, that is, instruction execution, are repeated. When a program number is set in the program number register 9 in FIG. If the retrieved instruction is a sequence instruction, the instruction is given to the sequence instruction execution unit 3, and the instruction is executed by a logical operation such as an AND or OR gate. At the same time, the contents of the program number register 9 are updated to become the next instruction. This is done by setting the micro-program address for updating the program number in the micro-address register 7 by the jump address circuit 4, and by executing the updating of the program number by the micro-program processing circuit 10. This completes the execution of one instruction. The next command is executed in the same way. If the imported instruction is a numerical calculation instruction, the sequence instruction execution unit 3 stops and all instructions are executed by the microprocessor.
Since this is carried out by the program processing circuit 10, the start address of the micro program corresponding to the instruction is specified by the jump address circuit 4, and the start address is set in the micro address register 7.
In the micro program processing of this instruction execution,
7 micro address is updated and a series of micro program processing is performed. During this process,
It also includes updating of the program number register 9.

The timing circuit 5 controls the above operations, and its timing is shown in FIG. The program number register 9 is as shown in A of FIG.
It is set in advance, and starts from setting the instruction capture register 2 as shown in FIG. 3B. After setting the capture register 2, the third
Execution of the sequence command shown in Figure C and Figure 3D,
A jump address is set in the micro address register shown at E, and the micro program is executed as shown at F in FIG. When the execution of the sequence instruction and the microprogram are completed, the next instruction is set in the capture register, and the same process is repeated. The program number register is updated by executing a microprogram.

Next, it will be explained using specific instructions. FIG. 4 shows the instruction format. The sequence command is shown in Figure 4a.
As shown in the figure, it consists of OP1, which distinguishes the type of instruction, and the execution target address ADDR. Numerical calculation instructions are distinguished by OP1 and OP2, as shown in FIG. 4b. OP1 is similar to a sequence instruction, but one specific code is assigned to a numerical operation instruction, and OP2 distinguishes between numerical operation instructions. After OP1 and OP2, the data or address to be executed comes. Numerical calculation instructions are as follows in OP1,
Consists of OP2, DATA or ADDR. Instructions in the format shown above are stored in one program memory.

Next, the processing of the example program shown in FIG. 5 will be explained. First, program number register 9 in Figure 1 shows 100, and instruction capture register 2 shows
The command COMPARE is imported.
The COMPARE instruction stores the contents of the numerical calculation register 13 that stores the calculation results before this instruction,
This is a numerical calculation instruction that compares the contents of program number 101 with 500 and sets the result in the sequence calculation register 12. In other words, if you import number 100,
Jump address circuit 4 indicates the start address of the COMPARE instruction execution microprogram,
It is set in the micro address register 7 and the micro program processing circuit 10 is activated. This micro program processing circuit 10 takes in data No. 101, and the contents and calculation register 13
Compare the contents of The comparison result is set in the sequence calculation register 12. At the same time, the program number is incremented by one. This completes the processing of the COMPARE instruction and reads the next AND instruction. The AND instruction is a sequence instruction that performs an AND operation between the contents of the address indicated by ADDR and the contents of the sequence operation register 12, and sets the result in the sequence operation register 12. In other words, since the fetched instruction is a sequence instruction, the sequence instruction execution unit 3
Then, the contents of the sequence calculation register 12 and the contents of address 1000 are ANDed and set in the sequence calculation register 12 again. At the same time, the microprogram processing circuit 10 updates the program number. In this case as well, when an instruction is fetched, the start address of the microprogram is issued by the jump address circuit 4, set in the microaddress register 7, and the number is updated. In the case of sequence instructions, the instruction execution and program number update are performed simultaneously. A flowchart showing the flow of such processing is shown in FIG.

According to this embodiment, complex numerical operations can be performed and sequence instructions can be processed at high speed.

As explained above, according to the present invention, by executing sequence instructions using hardware and managing program numbers using a microprogram, processing speed can be increased, and complex numerical calculation instructions Since this is processed by a micro program, the amount of hardware is small, and it is possible to provide a sequence control device with a numerical calculation function that is inexpensive and high-speed as a whole.

[Brief explanation of the drawing]

Fig. 1 is a block diagram explaining one embodiment of the present invention, Fig. 2 is a flowchart explaining an overview of the overall operation, Fig. 3 is a time chart of the embodiment, and Figs. 4 a and b are embodiments. Instruction format diagram, 5th
The figure shows a program example, and FIG. 6 is a flowchart of the instruction processing microprogram of the embodiment. DESCRIPTION OF SYMBOLS 1...Program memory, 2...Instruction capture register, 3...Sequence instruction execution unit, 4...Jump address circuit, 5...Timing circuit, 6...
...Control unit, 7...Micro address register, 8
... Numerical calculation instruction register, 9... Program number register, 10... Micro program processing circuit, 11... Input/output unit, 12... Sequence calculation register, 13... Numerical calculation register.

Claims (1)

[Claims] 1 In a stored program-type sequence control device with a numerical calculation function that performs sequence logic operations and numerical calculations, a microprogram control that, as an instruction execution unit, executes numerical calculation instructions and updates the program number of the next instruction to be executed. It has a numerical calculation instruction execution unit of When the sequence instruction is executed, the program number is updated under the microprogram control of the numerical calculation instruction execution unit. 1. A sequence control device with a numerical calculation function, characterized in that the hardware of a sequence instruction execution unit simultaneously executes a sequence instruction.