JP2949118B1 - Encoder data output method for bus communication type encoder device - Google Patents

Abstract

An encoder data output method of a conventional bus communication type encoder device is constant regardless of the number of encoders. Therefore, even when the number of encoders is small, the same cycle as when the number of encoders is large is used. Communication time could not be reduced. SOLUTION: The encoder output method of the bus communication type encoder device according to the present invention provides a request signal (9) by adding actual number information of encoders (1 to 6) connected to a bus communication line (10). Is a method in which the communication time can be reduced by changing the cycle according to the number.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an encoder data output method for a bus communication type encoder device, and more particularly to an encoder data output method for a bus communication type encoder device, not the maximum number of encoders which can be connected to a bus. The encoder which received the request signal puts the number of units on the request signal and stops the request signal detection function for the time during which the number of encoders included in the request signal transmits the encoder data. Since the time of the signal mask state is changed and the cycle of the request signal is changed in accordance with the number of devices, the present invention relates to a novel improvement for shortening the communication cycle as compared with the related art.

[0002]

2. Description of the Related Art Conventionally, as a method of outputting encoder data of a bus communication type encoder device of this kind, the methods shown in FIGS. 3 and 4 are employed. That is, in the case of FIG. 3, eight buses, which are the maximum number of encoders in which the encoder device can function, are connected to the bus communication line.
The stop state 21 in which the function of detecting the request signal 9 is always stopped only during the time when the encoder 8 transmits the encoder data, ie, the mask state. This output method is the same when the number of encoders shown in FIG. 4 is six. That is, the communication cycle is T ₁ = T ₂ .

[0003]

The encoder data output method of the conventional bus communication type encoder device has the following problems because it is configured as described above. That is, since the cycle of the request signal is constant irrespective of the number of encoders of the encoder device, for example, even when the number is small, the same cycle T ₁ = T ₂ as when the number is large is used. It was not possible to get a reduction in time.

[0004] The present invention has been made to solve the above problems, and in particular, it is not the maximum number of encoders that can be connected to a bus that the apparatus itself has in function, but the number of buses actually connected at that time. On the request signal,
The encoder that has received the request signal stops the request signal detection function for the time during which the number of encoders included in the request signal transmits the encoder data, that is, changes the time of the request signal mask state according to the number information. Accordingly, an object of the present invention is to provide an encoder data output method of a bus communication type encoder device capable of shortening a communication cycle as compared with a conventional one because a request signal cycle is changed according to the number of request signals.

[0005]

An encoder data output method for a bus communication type encoder device according to the present invention uses a plurality of encoders for transmitting encoder data in synchronization with a request signal, and outputs a request signal from the outside to the encoder. In the encoder data output method of the bus communication type encoder device, wherein the communication of the encoder communication and the communication of outputting the encoder data are performed on the same bus communication line, the actual number of the encoders connected to the bus communication line A method of putting the number information of the request signal on the request signal, and the encoder having received the request signal suspending the detection function of the request signal for a time during which the number of encoders included in the request signal transmits encoder data. And the request signal The cycle is a method to be variable according to the number of the encoder.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of an encoder data output method for a bus communication type encoder according to the present invention will be described below with reference to the drawings. The same or equivalent parts as in the conventional example will be described with the same reference numerals.
Each of the encoders 1 to 8 in FIG. 1 is connected to a control unit 1
2 is configured to transmit the encoder data 1a to 8a.

Next, the operation will be described. As shown in the time chart of FIG. 2, the request signal 9 is transmitted through the communication line 10, the first axis encoder 1 is called, and the transmission state 20 in which the encoder data 1a is transmitted from the reception state 22 is transmitted. Between the other encoders 2
8 denotes a mask state in which the request signal 9 cannot be received, that is, a detection function for detecting the request signal 9 is stopped.
Is controlled by a CPU (not shown) or the like inside the encoder. The stop state 21 is represented at an intermediate level between the reception state 22 and the transmission state 20 in the time chart of FIG.

The request signal 9 is a signal developed especially in the present invention, and carries information on the number of encoders 1 to 8 connected to the bus communication line 10 of the encoder device. Therefore, the detection function of the request signal 9 is stopped for the time during which the encoders 1 to 8 included in the request signal transmit the encoder data 1a to 8a. In other words, the encoder device is not the maximum number (N) of the bus communication lines 10 used by the bus communication line 10 as in the prior art, but the actual number less than this number (N) included in the request signal 9. Is carried as number information, for example, six encoders 1 to 6
In the case of the configuration shown in FIG. 2 using the information, six pieces of information, which is the actual number, are input to the request signal 9.
Is set to the request signal mask state only for the time of transmitting the request signal. Therefore, as is apparent from a comparison between the case of the six encoders 1 to 6 in FIG. 2 and the case of the conventional six encoders 1 to 6 in FIG. 4, the communication cycle of the request signal 9 is T ₃ > a T _2, when a reduced number of encoder is shortened cycle or communication cycle of the request signal 9 in response thereto, it can be compared with the conventional improving communication cycle.

[0009]

The encoder data output method of the bus communication type encoder device according to the present invention is configured as described above, so that the following effects can be obtained. That is, by putting the number of encoders actually connected to the encoder device on the request signal, the communication cycle of the request signal can be made variable, and when the number is smaller than the conventional method in which the communication cycle is fixed, Can be greatly reduced.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing an encoder data output method of a bus communication type encoder device according to the present invention.

FIG. 2 is a chart showing a communication state using six encoders of FIG. 1;

FIG. 3 is a chart showing a conventional method.

FIG. 4 is a chart showing a conventional method.

[Explanation of symbols]

 1-6 Encoder 1a-6a Encoder data 9 Request signal 10 Bus communication line

Claims (2)

(57) [Claims] A plurality of encoders (1-6) for transmitting encoder data (1a-6a) in synchronization with a request signal (9)
Communication of an external request signal (9) to the encoders (1 to 6) and the encoder data (1a to 6).
In the encoder data output method of the bus communication type encoder device, wherein the communication for performing the output of (a) is performed on the same bus communication line (10), the encoder (1 to 10) connected to the bus communication line (10) is used. 6) The number information of the actual number of units is put on the request signal (9), and the request signal (9)
The encoders (1 to 6) receiving the request signal (9), the number of encoders (1 to 6) included in the request signal (9) the encoder signal (1a to 6a) for the time of transmitting the request signal (9) of the request signal (9) An encoder data output method for a bus communication type encoder device, wherein the detection function is stopped. 2. The cycle of the request signal (9) is as follows:
2. The encoder data output method for a bus communication type encoder device according to claim 1, wherein said encoder data is variable according to the number of said encoders (1 to 6).