JPS60222720A - Analog recording system - Google Patents

Abstract

PURPOSE:To indicate the stop of the operation of a central processing unit clearly, by providing a device, which generates a specified output signal in an analog output unit, and inputting the output of a generating device to an analog recorder. CONSTITUTION:When a fault is generated in the operation of a central processing unit 3, a memory 41 is not rewritten and a counter 44 is not reset. Then, the memory 41 is cleared to zero by a carrier output COT of the counter 44 after 10sec. Therefore, the output digital value of the memory 41 becomes zero and the analog value becomes also zero. When a scale indicates the fault when the analog voltage value is zero as the scale of the analog recorder, a recorder is quickly moved to the end part on recording paper after a specified time. By indicating the occurrence of the fault of the central processing unit 3 by the locus of the analog recorder 5, warning is issued to the maintenance personnel.

Description

Detailed Description of the Invention (1) Technical Field of the Invention The present invention makes it possible to determine based on the trajectory of the analog recording needle when the operation of the central processing unit stops while recording analog values processed by the central processing unit. Regarding analog recording methods.

(2) Prior Art and Problems In the conventional analog recording system shown in FIG. It is received and once taken into the central processing unit 3. After the central processing unit 3 processes the data, it writes to the analog output unit 4. This analog output unit 4 records its values by means of an analog recorder 5.

The analog output unit 4 includes an address decoder 40, a memory 41, and a D/A converter 42.

The central processing unit 3 outputs addresses to a plurality of analog output units 4 via an address bus 3. The address decoder 40 detects the arrival of write data addressed to itself and issues a write enable signal to the memory 41.

The central processing unit 3 continues to the data bus 3 at the aforementioned address.
2, data is written into the memory 41 by the write enable signal. Assuming that the data from the sensor 1 is a signal that measures the water level of a dam, for example, the digital value processed by the central processing unit is converted into an analog value by the D/A converter 42, and the recorder 5 records the water level in meters. given to. In the analog recorder 5, measured values between Qm and tom are recorded on a recording paper 52 by a recording needle 53 over time as shown by a scale 51 in FIG. Since the central processing unit 3 sends out the afterfire data for a predetermined period of time, the memory 41 is rewritten and a record is made on the recording paper 52 based on the new data. The central processing unit does not operate at time t due to some kind of abnormality.

When the operation is stopped, the memory 41 of the analog output unit 4 is no longer rewritten, and the pointer of the analog recorder 5 is held at the value before the operation was stopped.

Therefore, when monitoring the recording on the recording paper 52, it was mistakenly assumed that there was no change in the water level and that it remained at a constant value, and it was delayed to realize that there was a problem with the central processing unit 3.

(3) Object of the Invention The object of the present invention is to improve the above-mentioned drawbacks and to provide an analog recording method that changes the locus of the analog recorder to clearly indicate when the central processing unit has stopped operating.

(4) Structure of the Invention The structure of the present invention to achieve the above-mentioned object is that the central processing unit processes the input signal once, inputs it to the analog recorder via the analog output unit, and performs recording. In this method, the analog output machine is equipped with a device that generates a specific output signal when the central processing unit stops operating, and the output of the generator is input to the analog recorder.

(5) Embodiment of the Invention FIG. 3 is a block diagram showing the configuration of an embodiment of the invention in correspondence with FIG. 1. In FIG. 3, 43 is a pulse oscillator that generates pulses at intervals of, for example, 1 second, and 44 is a pulse counter. Other same reference numerals as in FIG. 1 indicate similar parts.

The pulse counter 44 counts the output pulses of the pulse oscillator 43, and when a predetermined value is reached, outputs a carry output COT as an alarm signal. The predetermined value is determined by the central processing unit 3.
For example, a value slightly longer than the rewriting interval of the memory 41 is set to 10 seconds. When the pulse oscillator 43 outputs pulses at 1 second intervals, the carry of the needle counter 44 is set to be output when 10 seconds or more have elapsed. Further, the output of the address decoder 40 of the analog output unit 4 is applied to the counter 44 so that the memory 41 is reset at the rewriting interval of the memory 41. When the central processing bag W3 is operating normally, the memory 41 is rewritten at predetermined rewrite times as in the case of FIG. Since the pulse counter 44 in FIG. 3 is reset at the same time, the carry output COT of the counter 44 is not generated. If a failure occurs in the operation of the central processing unit 3 and it stops, the memory 41 is not rewritten and the counter 44 is not reset. Clear to zero. Therefore, the output digital value of the memory 41 is zero, and the analog value is also zero. As shown in FIG. 4 as a scale 51 of an analog recorder, when the scale displays "failure" when the analog voltage value 54 is zero, the recording needle 53 suddenly moves to the end on the recording paper 52 at time t1. Moving. Therefore, by indicating the occurrence of a failure in the central processing unit 3 by the trajectory of the analog recorder 5, a warning can be given to the maintenance personnel. As shown in FIG. 4, it can be seen that the central processing unit 3 was in failure during the time recorded in the "failure" position. If there is no data input due to a failure of the sensor 1 instead of the central processing unit 3, the central processing unit 3 will not give a clear signal to the memo 1J41, but will hold the previous value for a predetermined period of time, and then A stoppage of the central processing unit and a failure of the sensor can be distinguished by the absence of a signal.

The reset signal of the pulse counter 44 is the address deco /-
In addition to using the output of the data processor 40, a reset signal 33 may be sent as shown by a broken line after data 32 is sent from the central processing unit to the memory.

(6) Effects of the Invention In this manner, according to the present invention, with a simple configuration, it is possible to determine that the operation of the central processing unit has stopped.

Therefore, it is effective to distinguish between the presence and absence of a change in the value to be recorded.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the conventional analog recording system, FIG. 2 is a diagram showing the configuration of the analog recorder in FIG. 1, and FIG. 3 is a block diagram showing the configuration of an embodiment of the present invention. FIG. 4 is a diagram showing the configuration of analog recording δ1 in FIG. 3. ■-Sensor 3-Central processing unit 4-Analog output unit 40-Address decoder 41-Memory 42-D/A converter 43-Pulse oscillator 44-Pulse counter 5-Analog recording needle 51-Scale 52-Recording paper 53- Recording needle 54 - Analog voltage value Patent applicant Fujitsu Limited Agent Patent attorney Eisuke Suzuki Figure 1 Figure 2

Claims (1)

[Claims] A device that generates a specific output signal when the central processing unit stops operating in an analog recording system in which the central processing unit processes the input signal and then inputs it to the analog recorder via the analog output unit for recording. An analog recording method characterized in that the analog output unit is equipped with a generator, and the output of the generator is input to the analog recorder.