Control processor for user setting a change prohibition period d

Details Control processor for user setting a change prohibition period d Control processor for user setting a change prohibition period d

1996-07-22

1999-08-17

Lee, Thomas C.

395849, G06F 1300

Patent

active

059406283

ABSTRACT:
A programmable logic controller for executing a control process in a controlled apparatus in accordance with execution of a user program includes a flag set section for setting a change prohibition period therein about the user program stored in a user program memory, and a control process section responsive to receipt of a program change command in the change prohibition period set in the flag set section for suspending a program change process but executing the program change process after the lapse of the change prohibition period.

REFERENCES:
patent: 4249248 (1981-02-01), Yomogida et al.
patent: 4638452 (1987-01-01), Schultz et al.
patent: 4688449 (1987-08-01), Harada et al.
patent: 5155812 (1992-10-01), Ehlig et al.
patent: 5471608 (1995-11-01), Lee et al.
patent: 5491815 (1996-02-01), Basso et al.

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