JPS5781610A - Instruction change system for programmable logic controller - Google Patents

Instruction change system for programmable logic controller

Info

Publication number
JPS5781610A
JPS5781610A JP15752580A JP15752580A JPS5781610A JP S5781610 A JPS5781610 A JP S5781610A JP 15752580 A JP15752580 A JP 15752580A JP 15752580 A JP15752580 A JP 15752580A JP S5781610 A JPS5781610 A JP S5781610A
Authority
JP
Japan
Prior art keywords
word
register
data
program
instruction
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP15752580A
Other languages
Japanese (ja)
Other versions
JPS6023367B2 (en
Inventor
Yukio Kato
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Omron Corp
Original Assignee
Tateisi Electronics Co
Omron Tateisi Electronics Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Tateisi Electronics Co, Omron Tateisi Electronics Co filed Critical Tateisi Electronics Co
Priority to JP15752580A priority Critical patent/JPS6023367B2/en
Publication of JPS5781610A publication Critical patent/JPS5781610A/en
Publication of JPS6023367B2 publication Critical patent/JPS6023367B2/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B19/00—Programme-control systems
    • G05B19/02—Programme-control systems electric
    • G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
    • G05B19/05—Programmable logic controllers, e.g. simulating logic interconnections of signals according to ladder diagrams or function charts
    • G05B19/058—Safety, monitoring

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Automation & Control Theory (AREA)
  • Programmable Controllers (AREA)

Abstract

PURPOSE:To prevent a serious destruction of the program even for somewhat of erroneous operations in a two-word instruction, by specifying the two-word instruction stored in a user program memory during the decoding execution of user instructions and by changing numerical data of the second word. CONSTITUTION:When a user instruction which is addressed by a program counter PC and is read out from a program memory 1 coincides with data of the operation code and the element number of the first word of a two-word instruction to be changed which is stored in a register A, storage address data of the user instruction is latched in a register C. A program console control part 5 adds 1 to address data stored in the register C during an interruption time to indicate an address of the second word where numerical data should be entered. A preset signal is sent to the progrqm counter PC to preset data of the register C to the PC. A write signal is then sent to the program memory 1 to write numerical data of a register B, which is applied to a data input terminal Din of the program memory 1, to said address of this memory 1.
JP15752580A 1980-11-08 1980-11-08 Instruction change method in programmable logic controller Expired JPS6023367B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP15752580A JPS6023367B2 (en) 1980-11-08 1980-11-08 Instruction change method in programmable logic controller

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP15752580A JPS6023367B2 (en) 1980-11-08 1980-11-08 Instruction change method in programmable logic controller

Publications (2)

Publication Number Publication Date
JPS5781610A true JPS5781610A (en) 1982-05-21
JPS6023367B2 JPS6023367B2 (en) 1985-06-07

Family

ID=15651567

Family Applications (1)

Application Number Title Priority Date Filing Date
JP15752580A Expired JPS6023367B2 (en) 1980-11-08 1980-11-08 Instruction change method in programmable logic controller

Country Status (1)

Country Link
JP (1) JPS6023367B2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6029804A (en) * 1983-07-14 1985-02-15 Fuji Electric Co Ltd Program input device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6029804A (en) * 1983-07-14 1985-02-15 Fuji Electric Co Ltd Program input device

Also Published As

Publication number Publication date
JPS6023367B2 (en) 1985-06-07

Similar Documents

Publication Publication Date Title
US4058711A (en) Asynchronous dual function multiprocessor machine control
JPS5582359A (en) Microprogram test unit
KR860008500A (en) Data processing device
KR930003400B1 (en) Status register device for microprocessor
US4262346A (en) Multi function electronic timepiece
JPS5781610A (en) Instruction change system for programmable logic controller
KR940000980A (en) High Speed Ladder Instruction Processing Device for Programmable Logic Controller
JPS57135500A (en) Data memory protecting circuit
US4694419A (en) Programmable controller with direct to plant addressing
JPS5699550A (en) Information processing unit
DE3279057D1 (en) Programmable logic controller
JPS5452936A (en) Memroy processor
JPS5682951A (en) Microprogram controlling system
JP3597548B2 (en) Digital signal processor
JPS56127257A (en) State history storage device
EP0473410A2 (en) Central processing unit
JPS5474338A (en) Information processor
JPS59144909A (en) Stored program type controller
JPS573151A (en) Test system for 1-chip microcomputer
SU1049907A1 (en) Firmware control device
JPS5783807A (en) Programmable logic controller
SU830380A1 (en) Automatic control machine
JPS57199055A (en) Information processing device
JPS5769413A (en) Programmable logic controller
KR910010299A (en) Bit operation processing circuit of programmable controller