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Automatic terminal processing mode in signal transmitting system and signal transmitting terminal thereof
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A signal transmission system and terminal processing technology, which is applied in the direction of electrical digital data processing, instruments, etc., can solve the problems that it is difficult to completely eliminate the forgetting to connect the terminal resistance, and the communication instability of the signal transmission system.
Inactive Publication Date: 2009-11-18
KOYO ELECTRONICS INDS
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Problems solved by technology
Therefore, the communication of the signal transmission system is unstable from time to time
In addition, it is difficult to completely eliminate the phenomenon of forgetting to connect the terminal resistor
Method used
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no. 1 Embodiment approach
[0027] figure 1 A signal transmission system implementing the terminal processing method of the first embodiment is shown. Referring to this figure, a plurality of, for example, three signal transmission terminals 11, 12, 13 are connected in series. In this way, these signal transmission terminals 11 , 12 , and 13 constitute one signal transmission system 14 .
[0028] The signal transmission terminals 11, 12, 13 respectively have a built-in CPU 15, a communication interface 16, a relay circuit 17 and a plurality of terminal resistors 18, 19.
[0029] The respective communication interfaces 16 of the signal transmission terminals 11, 12, 13 are connected with signal transmission cables 22 such as RS485.
[0030] The CPUs 15 of the signal transmission terminals 11, 12, and 13 transmit and process signals to each other through the communication interface 16 of each other as a medium.
[0031] In the first embodiment, the signal transmission terminal 13 is the last-stage sign...
no. 2 Embodiment approach
[0056] image 3 A signal transmission system employing the terminal processing method according to the second embodiment of the present invention is shown. In this signal transmission system, a programmable logic controller (PLC) is used. PLCs are incorporated into the control systems that control many production machines. As peripheral modules (PLC modules) of the PLC, there are a power supply module, an input module, an output module, a communication module, and the like.
[0057] refer to image 3 , for the PLC31, a plurality of, for example, two PLC modules 321, 322 are used as signal transmission terminals and connected in series to form a signal transmission system.
[0058] Between the PLC 31 and the primary PLC module 321 , and between the primary and secondary PLC modules 321 , 322 are connected by request signal lines 33 a , 33 b , response signal lines 34 a , 34 b , and data signal lines 35 a , 35 b.
[0059] In order to simplify the description, two PLC modules...
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Abstract
The present invention provides an automatic terminal processing mode that the final signal transmitting terminal in a signal transmitting system having a plurality of signal transmitting terminals which are connected in series can be performed with a terminal process of signal reflection prevention. In each CPU inside the signal transmitting terminals, a function of requesting responses from the backward stage side, a function of receiving responses from the backward stage side, and a function of performing an automatic terminal process on its own terminal output part when no requested response is received. The signal transmitting terminal can have a judgement result that a signal transmitting terminal in a signal transmitting system is the final according to a situation that the responses can not be received and the signal transmitting terminal can perform an automatic terminal process on its own terminal output part by using the terminal resistance.
Description
technical field [0001] The present invention relates to a method of performing termination processing on a signal transmission terminal at a final stage by using a terminal resistor in a signal transmission system in which a plurality of signal transmission terminals are serially connected, and a signal transmission terminal equipped with the method. Background technique [0002] As a signal transmission system, there is, for example, a high-speed digital signaltransmission system using an RS-485 interface. As for this interface, RS-232, RS-422, RS-423, RS-449, RS-485, etc. standardized by EIA (Electronics Industries Association) are widely known. Also, RS-485 is considered an improved version of RS-422. In the digital signal transmission system using this RS-485, since data is transmitted at high speed, if the impedance does not match, multiple reflections of the transmission signal will occur, resulting in distortion of the waveform of the transmission signal, and transm...
Claims
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