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    • 2. 发明专利
    • INFORMATION PROCESSOR PROVIDED WITH TRANSMITTING FUNCTION AND TRANSMISSION MONITORING METHOD FOR THE SAME
    • JPH07334391A
    • 1995-12-22
    • JP12842394
    • 1994-06-10
    • FUJI ELECTRIC CO LTD
    • ITO KEIICHI
    • G06F11/30G06F13/00
    • PURPOSE:To continue control and arithmetic as the information processor even in the case of any abnormality at a transmitting function by interrupting a main transmission processing program, calling a program counter value and a stack pointer value and continuously processing an interrupted information processing program when processing time exceeds the set time of a monitoring timer. CONSTITUTION:A main transmission processing program S4 equipped with a priority level higher than that of an information program S2 is arranged, and the monitoring timer constituted as one part of this main transmission processing program S4 and equipped with the set time within the term of routine interruption is provided to monitor the transmission processing time. That monitoring timer monitors the transmission processing time and when this time exceeds the set time of the monitoring timer, transmission abnormality is decided. Then, the main transmission processing program S4 is interrupted, the program count value and the stack pointer value stored in a memory 3A are called, and the interrupted information processing program S2 is continuously processed. Therefore, even when any abnormality is generated at the transmitting function, the control and arithmetic of an information processor 1 can be continued.
    • 5. 发明专利
    • CENTRAL ARITHMETIC PROCESSOR
    • JPH0272435A
    • 1990-03-12
    • JP22341588
    • 1988-09-08
    • FUJI ELECTRIC CO LTD
    • ITO KEIICHI
    • G06F9/48G06F9/46
    • PURPOSE:To surely accept the requests for execution of the interruption programs having low preference ranks even though the executing requests are frequently produced to the interruption programs having high preference ranks by executing the interruption processes in the order of storage of identification numbers. CONSTITUTION:A RAM 3 includes an execution flag 3-1 and a sequence table 3-2. The flag 3-1 stores the attribute information that shows whether a CPU 1 is executing an interruption program or not. The table 3-2 stores the identification numbers of the requested interruption programs in the order of their inputs. Then the CPU 1 executes the arithmetic program stored in a ROM 2 and then executes the interruption programs in the order of input of the executing requests by reference to the table 3-2. Thus the interruption programs of low preference ranks are surely executed even though the executing requests are frequently produced for the interruption programs of high preference ranks.
    • 6. 发明专利
    • INITIALIZING METHOD FOR PROGRAMMABLE CONTROLLER
    • JPH03210601A
    • 1991-09-13
    • JP561990
    • 1990-01-12
    • FUJI ELECTRIC CO LTD
    • ITO KEIICHI
    • G05B19/05
    • PURPOSE:To give no influence to the normal processing of a programmable controller by setting an exclusive fixed time limit in a fixed period for execution of the initialization and performing the initialization of an input/output unit over plural periods when the time for initialization of the input/output unit exceeds a fixed level. CONSTITUTION:A programmable controller 1 is connected to the collective module units 2 via a bus cable 3. An exclusive fixed time limit is set within a fixed period for execution of the initialization of the controller 1. Then the initialization of an input/output unit is performed over plural periods when the time for initialization of the input/output unit exceeds a fixed level. In other words, a fixed time limit is set for initialization of the input/output unit and this unit is initialized in time division of plural periods. Thus it is not required to increase the scanning time despite a large number of input/output units for extension. As a result, no influence is given to the scanning time despite the extension of input/output units like the units 2, etc.
    • 9. 发明专利
    • METHOD FOR INITIALIZING MICROCOMPUTER SYSTEM
    • JPH0854966A
    • 1996-02-27
    • JP18915794
    • 1994-08-11
    • FUJI ELECTRIC CO LTD
    • ITO KEIICHI
    • G06F11/14G06F1/24
    • PURPOSE:To prevent the runaway due to the abnormality of a RAM by performing the initialization of a CPU in a microcomputer board without using the CALL/RET instruction for which the RAM is used. CONSTITUTION:Steps S1 to S6 A are initialization processings for which a RAM is not used. Namely, at first, an interruption is inhibited (S2), a CPU internal register is initialized (S3) and the initialization of a CPU is performed (S4A). In this initialization of the CPU, the initialization is performed by using the macroinstruction of an assembler level corresponding to the CALL and RET for which an internal register is used in place of the RAM for a sub-routine processing. Next, a memory check is performed (S5A) and the presence or absence of an abnormality is discriminated (S5B). When the abnormality does not exist, a stack pointer is set (S6A) and the processing is proceeded to the initialization processing (S7) of a peripheral device for which the RAM is used. Therefore, the initialization processing of the microcomputer system can be performed without causing the runaway due to the abnormality of the RAM and the contents thereof can be known at the time of the abnormality of the RAM.