JPH01278144A - Time setting device - Google Patents

Abstract

PURPOSE:To eliminate the error of time set by each slave station by producing a new time setting frame in consideration of delay time caused by the slave station when a slave station device receives the time setting frame from a master station and sending said new time setting frame to the slave station device. CONSTITUTION:A master station device 54 transmits a time setting frame including time information 16, delay time information 17 and passing slave station number information via a transmission means. A slave station device 55 receives said frame and adds the product of the delay time and the number of passing slave stations included in the received frame to the time information also included in the frame. The value of this addition is used as the set time and 1 is added to the number of passing slave stations included in the time setting frame as a new time setting frame. This new frame is sent to the device 55. Thus it is possible to correct the delay time of the device 55 and to eliminate the error of the time set by each device 55.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a time setting device in a loop network.

[Conventional technology]

In data transmission in which data representing a regular array of constant pulses as a code is exchanged between transmitting and receiving terminals, a constant regular procedure called transmission control is defined. There are four types of transmission control: line control, synchronization, error control, and transmission control procedure. Synchronous control is important to correctly transmit and receive data codes and to synchronize the timing between the transmitting and receiving sides. Now, the following types of time setting methods related to the present application are conventionally known.

That is, the master station device sets the time for all N slave station devices at the same time and performs data communication. For this reason, the master station device is provided with means for transmitting a time setting frame, which includes a time information section and a control section indicating the time setting frame. The slave station device is provided with means for using the time information as the set time when receiving the time setting frame, and transmitting the received time setting frame as it is to the next slave station device. .

Thereby, the master station device is configured to set the time for the Kaneko station devices all at once.

[Problem to be solved by the invention]

However, in such conventional time setting methods, a delay time is added each time the time setting frame passes through a slave station device, so there is a problem in that an error occurs in the settings between slave station devices. .

Therefore, an object of the present invention is to create a new time setting frame in consideration of the delay time caused by the slave station when the slave station device receives a time setting frame from the master station, and send it to the next slave station device. Therefore, it is an object of the present invention to provide a time setting device that can eliminate errors in the time set by each slave station.

[Means to solve the problem]

In the time setting device of the present invention, one master station device and N slave station devices are set in a loop, and the master station device sets the time for all N slave station devices at once. In the network, time information, delay time information indicating the time by which the transmission frame is delayed by one of the slave station devices, and passed slave station number information indicating the number of the slave station devices through which the transmission frame has passed. The master station device is provided with a transmitting means for transmitting a time setting frame including the time setting frame, and the master station device receives the time setting frame and transmits the delay time indicated by the delay time information and the number of passed slave stations information included in the time setting frame. Add the bond with the number of passed slave stations indicated by to the above time information included in the above time setting frame, use that value as the set time, and further add 1 to the number of passed slave stations in the above time setting frame. The slave station device is provided with transmitting means for transmitting this as a new time setting frame to the next slave station device.

Therefore, when using the time setting device according to the present invention, the master station device transmits a time setting frame including time information, delay time information, and passed slave station number information via the transmitting means.

The slave station device receives this time setting frame, adds the product of the delay time included in it and the number of passed slave stations to the time information similarly included in the time setting frame, and uses that value as the set time. Furthermore, 1 is added to the number of passing slave stations of the time setting frame, and this is transmitted to the next slave station device as a new time setting frame. Thereby, the delay time of the slave station device can be corrected, and an error in the time set by each slave station device can be eliminated.

〔Example〕

Hereinafter, the present invention will be described in detail with reference to Examples.

FIG. 1 is a block diagram showing a transmitting means in a master station device in an embodiment of a time setting device according to the present invention.

This transmitting means 11 will be explained below.

In the figure, a time register 12, a delay time register 13
, the passing slave station number register 14 are respectively transmitted by the transmission control circuit 1.
Connected to 5. The time register 12 stores time information 16, and the delay time register 13 stores delay time information 17 indicating the time by which a transmission frame is delayed by one of the slave station devices. The passed slave station number register 14 also contains passed slave station number information 1 indicating the number of slave station devices through which the transmission frame has passed.
Store 8. The transmission control circuit 15 is connected to the transmission interface circuit 19. And this transmission control circuit 1
5 is time information 16 stored in the time register 12, delay time register 13, and passed slave station number register 14, respectively.
, delay time information 17, and passed slave station number information 18, a time setting frame 20 shown later is generated and sent to the transmission interface circuit 19. Transmission interface circuit 19
transmits this time setting frame 20 as transmission data 22 to the slave station device. In this case, the passing slave station number register 14
The content of is set to 0 in advance. Receiving interface circuit 2
3 and a reception control circuit 24 connected thereto operate to terminate the time setting frame 20 that has made one circuit around a loop network to be described later.

FIG. 2 is a schematic diagram showing a transmitting means in a slave station device in an embodiment of the time setting device according to the present invention.

This transmitting means 25 will be explained below.

In the figure, a reception ink interface circuit 26 receives transmission data from the transmission interface circuit 19 of the master station device in FIG. 1 as reception data 27. Then, this received data 27 is transferred to the reception control circuit 28 and the time information register 2.
9, the signal is sent to the delay time register 30 and the passed slave station number register 31, respectively. The reception control circuit 28 receives the received data 2
7, the control unit 32, which will be explained later, is identified. When this is determined to be a time setting frame, a timing pulse 34 is generated, and time information 1 is stored in the time information register 29, delay time register 30, and passing slave station number register 31, respectively.
6. Delay time information 17 and number of passed slave stations information 18 are stored. The multiplier 37 multiplies the delay time information 17 stored in the delay time register 30 by the number of passed slave stations information 18 stored in the passed slave station number register 31. Further, the adder 38 is
The multiplication result 39 of this multiplier 37 and the time information register 29
and the time information 16 stored in . This addition result 41 is a timing pulse 42 from the reception control circuit 28.
is stored in the time register 43. +1 adder 45
increments the time information 16 stored in the time information register 29, the delay time information 17 stored in the delay time register 30, and the number of passed slave stations information 18 stored in the passed slave station number register 31 by +1, respectively. , and sends the incremented information 46 to the transmission control circuit 47. As a result, the transmission control circuit 47 generates a time setting frame 49 to be transmitted to the next slave station device, and sends it to the transmission (g) interface circuit 50.
This time setting frame 49 is transmitted as transmission data 51 to the next slave station device. In this way, the master station device can set the time for the Kaneko station devices all at once.

Here, FIG. 3 shows a data format showing the above-mentioned time setting frame 20.49. This data format is composed of the control section 32 and the information section 52, as already explained in part. Further, the information section 52 includes the time inertia 16, delay time information 17, and passed slave station number information 18, which have already been described.

FIG. 4 shows a master station device 54 equipped with the time setting device of the present embodiment described above, and N slave station devices 55, . 552 ・
. . 55N are connected in a loop, and the master station device 54 sets the time for the slave station devices 551, 552, . . . , 558 all at once.

〔Effect of the invention〕

As described above, in the time setting device of the present invention, the transmitting means provided in the master station device transmits a time setting frame composed of time information, delay time information, and information on the number of passed slave stations to the slave station device; The slave station device that received this adds the product of the delay time included in the received time setting frame and the number of passed slave stations to the time information, uses that value as the set time, and also adds 1 to the number of passed slave stations. By adding this and sending it as a new time setting frame to the next slave station device, the delay time of the slave station device can be corrected, and the error in the time set by each slave station device can be eliminated. There is an effect that can be done.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing a transmitting means in a master station device of an embodiment of a time setting device according to the present invention, and FIG.
FIG. 3 is a block diagram showing the transmitting means in the slave station device of an embodiment of the time setting device according to the present invention. FIG. 3 is a diagram showing the data format of the time setting frame used in the present invention. FIG. FIG. 6 is a diagram showing a time setting situation when a master station device including an embodiment of the invention and N slave station devices are connected in a loop. 11... Transmission circuit of master station device, 25...
- Transmission circuit of slave station device, 54... Master station device, 55,...55. ...Slave station device. Applicant NEC Co., Ltd. Agent Patent Attorney Umeo Yamauchi Figure 1 Figure n % 4

Claims (1)

[Claims] In a loop network in which one master station device and N slave station devices are set in a loop, and the master station device sets the time for all N slave station devices at the same time. , time information including time information, delay time information indicating the time by which the transmission frame is delayed by one of the slave station devices, and passed slave station number information indicating the number of the slave station devices through which the transmission frame has passed. The master station device includes a transmitting means for transmitting a setting frame, and receives the time setting frame, and the delay time indicated by the delay time information and the passed slave station number information included in the time setting frame are indicated. Adding the product with the number of passing slave stations to the time information included in the time setting frame, using that value as the set time, and further adding 1 to the number of passing slave stations of the time setting frame, A time setting device characterized in that the slave station device includes a transmitting means for transmitting this as a new time setting frame to the next slave station device.