JPS6340419A - Analog signal transmission equipment - Google Patents

Abstract

PURPOSE:To extremely exactly process an analog signal as monitoring the quality of the analog signal from a detector by confirming a transmission start signal as an analog reference signal then fetching said signal together with an analog from the detector. CONSTITUTION:In a processor 3 which receives a signal from a transmission start signal generating circuit 6 receives first a transmission start signal for a time T1, and confirms that a trigger signal is outputted from a timer 1 to the detector 2. At this time, an analog signal outputted from the detector 2 for a time T2 is fetched as a normal detection result, and further in the processor 3, the fetched analog signal is subjected to a desired processing. Such a processing is periodically executed corresponding to respective signal patterns periodically transmitted from the transmission start signal generating circuit 6. In such a way, the processing of the analog signal can be executed as monitoring the normality/abnormality of the analog signal from the detector 2. As a result, an extremely exact processing of a detection result can be executed.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an analog signal transmission device, and is particularly characterized in that a transmission start signal generation circuit is interposed in a transmission line from a detector to a processing device. The present invention relates to a transmission start signal generation circuit.

[Prior Art] Fig. 3 shows a conventional analog signal transmission device. In the figure, 1 is a timer that outputs a predetermined periodic signal, and 2 is a timer that is triggered by receiving a periodic signal from the timer 1. A detector that outputs the detection result as an analog signal; 3 a processing device that receives an analog signal from the detector 2 via a transmission line 4 and performs desired processing on this analog signal; 4 a detector 2 and a processing device A signal line 5 is interposed between the timer 1 and the processing device 3. A signal line 5 is interposed between the timer 1 and the processing device 3.

Next, the operation will be explained. The detector 2 receives a periodic signal from the timer 1 and is triggered to start detection. The detector 2 converts the detection result into an analog signal and outputs it to the processing device 3 via the transmission line 4. On the other hand, timer 1
Then, a periodic signal is sent to the detector 2, and a transmission start signal is sent to the processing device 3 via the transmission line 5. The processing device 3 takes in the analog signal from the detector 2 as an input signal only when receiving the transmission start signal from the timer 1, and further performs desired processing on the thus taken in analog signal.

Note that timer 1 outputs the transmission start signal for a predetermined period of time, then stops outputting the transmission start signal for a predetermined period of time, and outputs the transmission start signal again for a predetermined period of time. emits.

[Problems to be Solved by the Invention] Since the conventional analog signal transmission device is configured as shown below, the analog signal output from the detector 2 is directly regarded as the detection level in the processing device 3. , when an abnormality occurs in the detector 2, it is difficult for the processing device 3 to recognize this abnormality.
There were problems such as the need for a transmission line 5 to the terminal, resulting in high cost.

This invention was made to solve the above-mentioned problems, and it is possible to check the quality of the output signal from the detector by combining the analog signal from the detector with the transmission start signal and inputting it to the processing device. It is an object of the present invention to provide an analog signal transmission device that can perform monitoring and reduce costs by inputting data to a processing device through a single transmission line.

[Means for Solving the Problems] The analog signal transmission device according to the present invention includes a transmission start signal generation circuit that receives signals from the detector and the timer, interposed in the transmission line between the detector and the processing device. Then, the transmission start signal generation circuit is triggered by receiving the periodic signal from the timer mentioned above, and combines the analog signal from the detector with the transmission start signal to form these signals into a desired signal pattern. It is configured such that the data is transmitted to the processing device.

[Function] In the analog signal transmission device of the present invention, the detector is triggered in response to a periodic signal from the timer, and the detection result by the detector is input as an analog signal to the transmission start signal generation circuit. is triggered by receiving a periodic signal from the timer, and the transmission start signal generation circuit combines the transmission start signal with the analog signal from the detector mentioned above, and these signals are converted into a desired signal pattern and processed as described above. transmitted to the device.

[Embodiment of the Invention] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. 1st
In the figure, 1 is a timer that outputs a predetermined periodic signal; 2 is a timer that outputs a predetermined periodic signal;
is a detector which outputs a detection result as an analog signal by being triggered by receiving a periodic signal from timer 1;
3 is a processing device that receives the combination signal of the analog signal and the transmission start signal output from the transmission start signal generation circuit 6 via the transmission line 7 and performs desired processing on this analog signal; 6 is the cycle from the timer 1; A transmission start signal generation circuit 7 generates a transmission start signal when triggered by a signal, and 7 is a transmission line interposed between the analog signal 6 and the processing device 3.

Next, the operation will be explained.

The timer 1 generates a predetermined periodic signal set according to the purpose of detection, outputs the same periodic signal to the detector 2 and the transmission start signal generation circuit 6, and triggers the detector 2 and the transmission start signal generation circuit 6.

The detector 2 receives a periodic signal from the timer 1 and is triggered to perform required detection of a detection target (not shown). Furthermore, upon completion of this detection, the detector 2 converts the detection result into an analog signal and outputs it to the transmission start signal generation circuit 6.

The transmission start signal generation circuit 6 generates a transmission start signal by being triggered by receiving the periodic signal from the timer 1, and combines this transmission start signal with the analog signal input from the detector 2 to generate these signals. The signal is converted into an appropriate signal pattern and transmitted to the processing device 3 via the transmission line 7. Note that the transmission start signal 6 is an analog reference signal that serves as a reference for the analog signal input from the detector 2.

As shown in FIG. 2, the signal pattern transmitted to the processing device 3 is such that the transmission start signal is first output for a time T1, and then the analog signal input from the detector 2 is output for a time T2.
This is based on a pattern of outputting for a certain amount of time and then stopping the output.

Then, such a signal pattern is periodically transmitted to the processing device 3.
transmitted to.

Processing device 3 receiving a signal from transmission start signal generation circuit 6
First of all, we will confirm that the transmission start signal is received for T□ waiting time and the trigger signal is output from timer 1 to detector 2. After this, the analog signal output from detector 2 for T2 time is confirmed. is taken as a regular detection result. Further, in the processing device 3, the captured analog signal is subjected to desired processing.

Such processing is periodically performed in response to each signal pattern periodically transmitted from the transmission start signal generating circuit 6.

In this way, in the processing device 3, the transmission start signal is used as an analog reference signal, and this analog reference signal and the detector 2
Since the analog signal from the detector 2 is taken in after comparing and confirming the analog signal from the detector 2, the analog signal can be processed while monitoring the quality of the analog signal from the detector 2, making it extremely reliable. This has the effect of making it possible to process the detection results.

Furthermore, since the analog signal from the detector 2 and the transmission start signal from the transmission start signal generation circuit 6 are sent as a series of pattern signals from the transmission start signal generation circuit 6 to the processing device 3, the transmission can be started. It is sufficient to insert only one transmission line 7 between the signal generation circuit 6 and the processing device 3. Therefore, there is an advantage that installation costs can be reduced compared to the conventional case where two transmission lines are required.

[Effects of the Invention] As described above, according to the present invention, in the processing device,
Since the analog signal from the detector is taken in after confirming the transmission start signal as an analog reference signal, the analog signal can be processed while monitoring the quality of the analog signal from the detector, resulting in extremely reliable detection. This has the effect of making it possible to process the results.

-7= Also, between the transmission start signal generation circuit and the processing device, there is a
Since it is sufficient to install only one transmission line, there is an advantage that the installation cost can be reduced compared to the conventional case where two transmission lines are required.

[BRIEF DESCRIPTION OF THE DRAWINGS] FIG. 1 is a block diagram showing an analog signal transmission device according to an embodiment of the present invention, FIG. 2 is a schematic diagram of a transmission signal pattern of the analog signal transmission device according to an embodiment of the present invention,
FIG. 3 is a block diagram showing a conventional analog signal transmission device. In the figure, 1: timer, 2: detector, 3: processing device, 6: transmission start signal generation circuit, 7: transmission line. In addition, in the figures, the same reference numerals indicate the same or equivalent parts.

Claims (1)

[Claims] A timer that outputs a predetermined periodic signal, a detector that outputs the detection result as an analog signal when triggered by receiving the periodic signal from the timer, and receives the analog signal from the detector via a transmission line. and a processing device that performs desired processing on this analog signal, and a transmission start signal generation circuit that receives signals from the detector and timer is interposed in the transmission line between the detector and the processing device. Then, the transmission start signal generation circuit is triggered by receiving the periodic signal from the timer, and combines the analog signal from the detector with the transmission start signal to form a desired signal pattern from these signals and perform the above processing. An analog signal transmission device, characterized in that it is configured to transmit to a device.