JPS6144251B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a multi-point temperature monitoring device that processes information by recording and managing temperatures at multiple points, and in particular uses an analog meter for recording and a digital device for management. The feature is that the processing accuracy is improved.

For example, in a multi-point temperature monitoring device that involves information processing, such as issuing an alarm if the difference between the highest and lowest temperatures of multiple monitored temperatures exceeds a set value, conventionally the first
The block diagram shown in the figure was used. That is, in the figure, 11, 12, 13...1N are temperature detectors such as resistance temperature detectors or thermocouples, 21, 2
2, 23, ... 2N are the above-mentioned temperature detectors 11, 1
2, 13...output converters a, b, c, . . . for amplifying each detected analog output at 1N, respectively;
n is each output converter 21, 22, 23,...2
temperature output signals, 3 each amplified by N
1, 32, . . . 3N-1 is a low signal selector that successively compares the lower signals among the temperature output signals a, b, c, . . . n to select the lowest temperature output signal T ^min ; Each of the above temperature output signals a, b,
A multi-point dot recorder 5 records the temperature output signals a, b, c, ... n and the lowest temperature output signal T ^min , and calculates the value of this difference. A multi-point temperature difference comparator that outputs when exceeds a set value.
Reference numeral 6 denotes an alarm display lamp that issues and displays an alarm based on the output of the multi-point temperature difference comparator 5.

According to the above configuration, the temperature detectors 11, 12, 1
3,... Each point detected by 1N (N
The output signal of temperature at point) is output from output converter 2, respectively.
1, 22, 23, ... 2N to become temperature output signals a, b, c, ... n, and these temperature output signals a, b, c, ... n are sent to the multi-point dot recorder 4. It is entered and recorded. Temperature output signal a of the other output converter 21 and temperature output signal b of the output converter 22
is input to the low-level signal selector 31, and the lower one of the two is selected and output. Next, the output signal of this low level signal selector 31 and the output converter 23
Similarly, the temperature output signal c is input to the low-level signal selector 32, and the lower one of the two is selected. After successive comparison in this manner, the output of the final stage low-level signal selector 3 (N-1) becomes the lowest temperature output signal T ^min among the temperatures at N points. Further, this minimum temperature output signal T ^min and each of the temperature output signals a, b, c, . . .
b, c, ...N and the lowest temperature output signal T
The difference from ^min is measured, and if any of the difference values exceeds the set value, it is output to the alarm display lamp 6 to issue an alarm.

According to the multi-point temperature monitoring device configured with analog circuits as described above, the output signal of the temperature detector is usually weak, so it is difficult to use it by branching multiple circuits. The vessel is N
N-1 low-level signal selectors are required. Therefore, not only are there many components and the price is high, but also the minimum temperature output signal must be passed through one stage of output converter and N-1 stage of low-level signal selector, so the accuracy of the minimum temperature output signal is There were disadvantages such as a decrease in

In view of the above-mentioned circumstances, a system in which digital processing is performed by a microcomputer as shown in the block diagram of FIG. 2 is used. That is, in the figure, 11, 12, 13, . . . 1N and 21, 22, 23, . Microcomputers 71 and 72 directly input analog temperature output signals a, b, c, . . . 22, 23, . . . 2N
are an input scanner circuit and an A-D converter provided in the microcomputer 7, respectively, and the analog temperature output signals a, b, c, . . .
. . . n is input and switched and converted into digital data respectively. Further, T indicates each digitally converted temperature data signal, 8 indicates a printer for printing and recording each temperature data signal T, and 6 indicates an alarm by inputting an output signal processed by a program mechanism (not shown) of the microcomputer 7. This is a warning lamp.

According to the above configuration, the temperature detectors 11, 12, 1
The temperature output signals of N points detected by 3...1N are sent to temperature converters 21, 22, 23, . . . respectively.
Amplified by 2N, analog signals a, b, c, ...
It is input to the input scanner circuit 71 of the microcomputer 7 as n. Next, each of these inputs is digitally converted by an AD converter 72 to become a temperature data signal T, and this temperature data signal T is output to the printer 8 and digitally printed and recorded.
Furthermore, the maximum and minimum temperatures are determined from the temperature data signal T by a program mechanism within the microcomputer 7, and the temperature difference and the set value are compared and processed. As a result of this process, when the temperature difference exceeds the set value, an alarm signal is output to the alarm lamp 6, and the alarm lamp 9 displays this.

In a device using a microcomputer such as the one mentioned above, even if it is possible to install an output converter after the input scanner circuit to make a single unit, the input scanner circuit is a switching circuit for very weak signals. It became necessary to use a relatively high-grade circuit,
Therefore, as shown in FIG. 2, N output converters are usually provided in the same way as the analog circuit shown in FIG. 1. In addition, such a microcomputer can be easily configured using a known microprocessor, but the number of N points is particularly large, and if the input/output becomes complicated, the device will end up being expensive. do not have. Furthermore, temperature records are digitally printed on a printer, but digitally printed records usually have the disadvantage that it is difficult to intuitively read changes over time compared to analog records.

In order to eliminate the drawbacks of both devices as described above, the present invention provides an analog recorder so that temporal changes in temperature at multiple points can be read intuitively by analog recording, and a microcomputer to enable programming. It is an object of the present invention to provide a multi-point temperature monitoring device which is inexpensive and can improve information processing accuracy by processing the information and simplifying the digital input/output circuit to the microcomputer.

Hereinafter, one embodiment of the present invention will be explained with reference to the block diagram of FIG. 3.
N is the same temperature detector as the conventional device shown in FIGS. 1 and 2, and 9 is a dot-type multi-point temperature recorder having a multi-point automatic switching mechanism. The following circuits and members are provided. That is, 91 is an input switching circuit that inputs and switches each output signal of the temperature detectors 11, 12, 13, . . . 1N, 911, 912, 9
13,...91N are each switching contact of this circuit 91,
92, 93 and 94 respectively constitute a self-balancing mechanism to move the pointer pen and actuate the retransmission slide 95, respectively;
Servo amplifier and servo motor 96 is a code conversion circuit that converts the contact signals of the switching contacts 911, 912, 913, . . . 91N into address signals. In addition, ST is a reading permission signal that is output when the dot type multi-point temperature recorder 9 completes input switching and the pointer is completely balanced by the contact of the input switching circuit, and allows the computer to read the data. can use the recording drive signal of the recording pen. Further, 10 is an AD converter that converts the output signal of the retransmission slide 95 into a digital signal, and 11 is the code conversion circuit 96.
Address signal and read permission signal ST
and a digital signal from the A-D converter 10, a microcomputer 6' performs information processing.
is an alarm display lamp that displays an alarm based on the result of information processing by the microcomputer 11.

According to the above configuration, the temperature detectors 11, 12, 1
3...The temperature output signal detected at 1N is directly input to the dot type multi-point temperature recorder 9. Usually, such a dot type multi-point temperature recorder is equipped with an automatic balancing mechanism, and since the input impedance is high, an input circuit is provided to switch the weak signal of the temperature sensor, so that the output of the temperature sensor No converter required. The temperature output signal switched by the input switching circuit 91 moves the pointer pen by an automatic balance mechanism composed of a potentiometer circuit 92, a servo amplifier 93, and a servo motor 94.
The retransmission slide 95 is activated to retransmit the temperature output signal at each point as a resistance signal. This retransmission signal is converted into a digital signal by the AD converter 10 and supplied to the microcomputer 11.

On the other hand, in order to inform the microcomputer 11 what number the temperature output signal is, the switching signal in the dot-type multi-point temperature recorder 9 is converted into a code signal, that is, a switching point, by a code conversion circuit 96. The signal is converted into a signal indicating the position and supplied to the microcomputer 11. In addition, a reading permission signal ST is similarly outputted from the dotting type multi-point temperature recorder 9 to the microcomputer 11 so that the microcomputer 11 does not read the signal during the movement of the recording pen. As described above, the microcomputer 11 can read temperature data in synchronization with the dot-type multi-point thermometer 9 by inputting the three types of signals, the re-transmission slide signal, the switching signal, and the reading permission signal. . Therefore, by easily determining the maximum temperature and minimum temperature through program processing, and comparing and calculating the difference with a set value, it is possible to output an alarm signal and display an alarm. However, in this case, the information processing speed will be limited by the switching speed of the recorder, but normally,
The rate of change in temperature is not that fast over time, so this is not a problem.

Furthermore, the input to the microcomputer can be made up of 8 bits for reading temperature data with an accuracy of 0.5 class, 4 bits for 16 switching points, and 1 bit for the read permission signal, that is, only 13 bits in total.

In the above embodiment, a dot type multi-point temperature recorder was used, but if recording is not required and only instructions are required, a multi-point switching type automatic balance type indicator may also be used. If it is an instrument, it can be easily configured. Furthermore, although a retransmission slide is used in the above embodiment, if this is used as a digital encoder, an AD converter becomes unnecessary. Furthermore, the switching signal from the recorder to the microcomputer may be input point by point to the microcomputer without being encoded; in this case, a code conversion circuit is not required.

As described above, according to the present invention, it is only necessary to add a very small number of input/output circuits to an ordinary microprocessor, and therefore it can be realized in a size that can be built into a recorder having an automatic balancing mechanism. It is something that can be done.

That is, the transmission selection circuit, input switching circuit, and reading permission signal transmission circuit in the recorder may be of ordinary type.

In other words, each temperature at multiple points can be recorded in analog form using a recorder equipped with an automatic switching mechanism to make it easier to read, and it is also possible to process digital programs using a microcomputer to increase the accuracy of information processing. This has the advantage that the device can be made at low cost.

[Brief explanation of the drawing]

Fig. 1 is a block diagram showing a multi-point temperature monitoring device using conventional analog instrumentation, Fig. 2 is a block diagram showing a multi-point temperature monitoring device using a conventional microcomputer, and Fig. 3 is a block diagram showing an embodiment of the present invention. FIG. 2 is a block diagram showing a multi-point temperature monitoring device. 11, 12, 13, ... 1N: temperature detector,
9: Dot type multi-point temperature recorder, 91: Input switching circuit, 92: Potentiometer circuit, 93: Servo amplifier,
94: Servo motor, 95: Retransmission slide, 9
6: Code conversion circuit, ST: Read permission signal, 1
0: A-D converter, 11: Microcomputer, 6': Alarm indicator lamp. In the drawings, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Claims] 1 multiple temperature detectors each detecting temperature,
An input switching circuit that selectively switches and outputs analog signals from these temperature detectors, an analog recorder that records the analog signals output from this input switching circuit, and a digital signal that converts the analog signals output from the input switching circuit. a conversion circuit that converts the input switching circuit into a digital signal, a switching signal generation circuit that outputs the switching point position of the input switching circuit as a digital signal, a microcomputer that inputs and processes the digital signals from the conversion circuit and the switching signal emission circuit, and the analog recording. It is characterized by comprising a reading permission signal generation circuit which outputs a digital read permission signal to the microcomputer according to the operating state of the meter, and allows the microcomputer to read the digital signals from the conversion circuit and the switching signal generation circuit. Multi-point temperature monitoring device.