JPH08235086A - Time information transmitter - Google Patents

Abstract

PURPOSE: To provide a time information transmitter of simple constitution which is capable of exactly imparting time information to a large number of devices and synchronizing them with the device. CONSTITUTION: An input device 1 imparts an inputted device number and a data number to data and outputs the data to a bus L. An output device 2 or arithmetic units 3 and 4 fetches these data to which the required device numbers are imparted of the data transmitting in the bus L. A time information output device 6 outputs the discrimination code showing time information and the time information to the bus L. As a result, the input device 1 and other device 5 perform prescribed processings based on the time information to which the discrimination code is imparted among the data flowing in the bus L.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for transmitting time information in a device for transmitting data such as a process amount.

[0002]

2. Description of the Related Art Conventionally, as a data transmission system, process data such as temperature collected by a slave station is transmitted to the master station via a transmission line by the slave station in response to a polling signal from the master station, and the data taken in by the master station is transferred. After the processing, there is a polling method in which another slave station transmits the polling signal again.

However, in the polling system, the main station is always required and the polling signal is always required, so that the apparatus is complicated, it takes a long time to respond, and the communication speed is insufficient.

Further, there are various slave stations and the like such as a time display, a sequencer, and a recording device, and it is necessary to synchronize the time of these devices.

[0005]

In this case, it is necessary to give time information to all the devices that need to be connected to such a transmission line, but it is manually set for each of many devices. Is complicated, and the setting work is performed at different times, so that not all devices have the same time, and it is difficult to synchronize each device to the exact same time. It was

In view of the above points, an object of the present invention is to provide a transmission device having a simple structure and capable of accurately providing time information to many devices and synchronizing them.

[0007]

According to the present invention, an identification code indicating time information and a time information output device for outputting the time information to a bus, and the identification code among the data flowing through the bus are provided. It is a time information transmission device including another device that receives time information and performs a predetermined process based on this information.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a structural explanatory view showing an embodiment of the present invention. In FIG. 1, for example, a plurality of input devices 1, ..., A plurality of output devices 2, ..., A plurality of arithmetic devices 3, 4, ... Are provided on a bus L such as a common network as a transmission line.
Etc. are connected. Then, the output device 2, ..., The arithmetic devices 3, 4, ... A device number unique to the device is attached to each of these devices, and data or the like can be transmitted using this device number.

The analog signal data such as the temperature input to the input device 1 is output to the bus L with a unique device number of the input device 1 after being subjected to necessary processing such as linearization. . At this time, the input analog signal is converted into a digital signal by the integral AD converter in order to remove power source noise and the like.

Of the data flowing on the bus L in this way, necessary data is output from the output device 2, the arithmetic device 3,
4 will be taken in. Therefore, depending on which input device or arithmetic device data is required for these capture devices, the device number of the output data of the input device or arithmetic device required by the capture device is set as the capture number. Set in advance.

For example, if the data of the input device 1 is taken in by the output device 2 and the arithmetic device 3, the output device 2 and the arithmetic device 3 set the same number as the device number of the input device 1 as the take-in number. deep.

Of the data flowing through the bus L, the output device 2 discriminates and selects only the data having the device number of the corresponding input device 1 which coincides with the data acquisition number, fetches the data, and outputs the data after predetermined processing. .

Further, the arithmetic unit 3 selects, discriminates and fetches only the data having the device number of the input device 1 which matches the fetching number from the data flowing through the bus L. Then, after performing other necessary arithmetic operations such as averaging, the data is given a unique device number of the arithmetic device 3 and output to the bus L.

By setting the device number of the arithmetic device 3 as the acquisition number of the arithmetic device 4, the arithmetic device 3
The output data of is captured by the arithmetic unit 4. And
The arithmetic unit 4 performs a predetermined arithmetic processing again, and outputs this data to the bus L with a unique device number of the arithmetic unit 4. If two or more types of acquisition numbers are set in the arithmetic devices 3 and 4, various arithmetic processing can be performed on data from two or more types of devices.

In addition to these devices, a time display device for displaying the time at that time, a sequencer for fetching data from the bus L and performing various processes, and a recording device for fetching data from the bus L and displaying or recording the data. It is necessary to connect various other devices 5 ... to synchronize their respective times and maintain the simultaneity of the entire network system.

Then, the time information output device 6 connected to the bus L always outputs the time information to the bus L. In this case, the identification code indicating the time information is “99”, and the time is “February 28, 1995, 14:30:25”.
In the case of “second”, the following message output of the identification code and the time information data indicating the time information is transmitted to the bus L each time the minimum unit of time changes.

99 1995/02/28/14: 3
0:25 ... Then, for example, the input device 1 and the other devices 5 ... At the same time, the input device 1 and the other devices 5 receive and take in the time information with the identification code indicating that it is this time information, and use this as their own timepieces to determine the time Perform processing. As a result, the time information can be simultaneously transmitted to the required one or a plurality of devices, and the time does not shift. Also, the time information output device 6
The minimum unit of time automatically output from is 0.1 seconds,
If it is set to 0.01 second ...

The time information output device 6 is backed up by a backup power supply, a solar battery, or the like even if the system is shut down midway and power is not supplied, and the correct time is immediately output to the bus L when power is restored. You may do it.

[0019]

As described above, according to the present invention, an identification code indicating that it is time information and time information are output to a bus, and the time information is provided with another device that performs a predetermined process based on this information. It is a transmission device. For this reason, the main master station is not required, the communication speed can be made sufficiently high, and the configuration with only a minimum of two devices and a bus can combine dozens or hundreds of data and devices as long as the number allows. Can be configured easily, arbitrarily, and flexibly, and it is easy and sufficient for various systems, rich in flexibility and expandability,
Can respond effectively and efficiently. Also, with only one time information output device, all devices connected to the bus can obtain time information, each device can be accurately synchronized to the same time, and multiple devices can be individually connected to each other. There is no need to prepare a clock or the like, the entire device is simple, and it is not necessary to manually set each device, and the operation is easy and the time can be automatically changed. If the time information is automatically output to the bus when power is restored after the system goes down, the safety, accuracy, time synchronism, etc. of the system are further enhanced.

[Brief description of drawings]

FIG. 1 is a structural explanatory view showing an embodiment of the present invention.

[Explanation of symbols]

 1 Input Device 2 Output Device 3, 4 Arithmetic Device 5 Other Device 6 Time Information Output Device L Bus

Claims (1)

[Claims] 1. A time information output device for outputting an identification code indicating that it is time information and time information to a bus, and a time information to which the identification code is attached among the data flowing through the bus is received and added to this information. A time information transmission device comprising: another device that performs a predetermined process based on the time information transmission device.