Judement method for communication stability of network system, main unit, slave unit and relay station
A network system and main unit technology, applied in transmission systems, bus networks, digital transmission systems, etc., can solve the problems of not knowing the level of the field bus, not being able to judge whether it can be substituted, and rising costs.
Inactive Publication Date: 2004-09-08
ORMON CORP
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Problems solved by technology
[0011] However, in the invention shown in the above-mentioned Patent Document 1, although it is possible to judge whether it is good or not to a certain extent, it is still impossible to know the level of the field bus (how much margin there is for the boundary where communication cannot be performed).
[0012] In addition, even though it is known that there are various restrictions, in fact, in order to satisfy each restriction, users must stock various wire rods, which will lead to an increase in cost, so it is desirable to judge whether the existing wire rods can be used, and use substitutes if there are substitutes. In the above-mentioned Patent Document 1, it is not possible to judge whether the substitution
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[0033] figure 1 Embodiment 1 of the present invention is shown. Such as figure 1 As shown, PLC 10 and various slave units 20 are connected via field bus 30 to construct a network system. As the slave unit 20, there are devices such as a remote control IO. The field bus 30 is a bus type that connects the slave units 20 in series. Therefore, a terminating resistor 31 is connected to the terminal of the field bus 30 . Moreover, the personal computer 32 which is a setting tool is connected to PLC10, and the test pattern mentioned later can be provided to PLC10.
[0034]The PLC 10 is constituted by connecting components generated for each function, and includes, for example, a CPU component 11 , a main unit 12 , and the like. The master unit 12 is connected to a field bus 30 and communicates with each slave unit 20 . In addition, the IO memory of the CPU unit 11 is accessed via the internal bus of the PLC 10 to read and write IO data and the like.
[0035] main unit 12 as ...
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A method of judging communication stability is provided for a network system including a master unit forming a programmable controller and a slave connected to a network. The master unit transmits to the slave a distorted test pattern formed by distorting a standard test pattern to a specified distortion level. If this distorted test pattern is normally received by the slave, a response is returned from the slave to the master unit. If the mater unit receives this response normally, it is judged that this network system has communication stability corresponding to this specified distortion level.
Description
technical field [0001] The invention relates to a method for judging communication stability of a network system, a master unit, a slave unit and a relay station. Background technique [0002] PLC (programmable logic controller) used in FA (factory automation) inputs ON / OFF information of input devices such as switches and sensors, and executes logic operations according to sequence programs (user programs) written in rad-language, etc. After that, the PLC performs control by outputting ON / OFF information signals to output devices such as relays, valves, and actuators according to the obtained calculation results. [0003] As one aspect of the related PLC, a plurality of components generated for each function are prepared and constituted by electrical and mechanical connections. As units for configuring the relevant types, there are various units such as a power supply unit, a CPU unit, an I / O unit, and a main unit. [0004] In addition, the master unit is connected to a c...
Claims
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IPC IPC(8): G05B19/05H04L1/24H04L12/40H04L12/403H04L69/40
CPCH04L1/248H04L12/2697H04L12/403G05B2219/15018H04L43/50H04L1/244
Inventor 小岛俊之水谷征尔
Owner ORMON CORP