System and method for automatically testing analog module used for programmable logic controller (PLC)

An automatic test system and programming logic technology, applied in the direction of instruments, measuring devices, measuring electrical variables, etc., can solve problems such as huge workload and prone to measurement errors

Inactive Publication Date: 2010-11-17
SCHNEIDER ELECTRIC IND SAS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] When performing function and performance tests on PLC analog modules, it is necessary to test multiple items including conversion error, temperature offset, stability, etc., and analog modules usually have m

Method used

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  • System and method for automatically testing analog module used for programmable logic controller (PLC)
  • System and method for automatically testing analog module used for programmable logic controller (PLC)
  • System and method for automatically testing analog module used for programmable logic controller (PLC)

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Embodiment Construction

[0092] Reference will now be made in detail to example embodiments of the invention, examples of which are illustrated in the accompanying drawings. The embodiments are described below in order to explain the present invention by referring to the figures.

[0093] figure 1 It is a schematic diagram of the automatic test system of the analog quantity module in the programmable logic controller according to the present invention.

[0094] Such as figure 1 As shown, the programmable logic controller analog module automatic test system according to the present invention includes a host control computer 1, a programmable DC power supply 2, a programmable DC signal source 3, a digital multimeter 4, a temperature control box 5, channels and voltage / current mode switching control board 6 , the measured analog module 7 placed in the temperature controllable box 5 . The analog module automatic test system according to the present invention also includes a host control computer 1 and...

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Abstract

The invention discloses a system and a method for automatically testing an analog module with a settable input/output (I/O) channel in a programmable logic controller (PLC). The system comprises an upper control computer, a programmable direct current signal source, a digital multimeter, a channel and voltage/current mode switching control plate and a communication interface, wherein the upper control computer sets a testing parameter, issues an instruction to realize output or measurement, receives a test result and makes judgment according to the result; the programmable direct current signal source receives the instruction and the parameter to set the output as a voltage or current mode, sets and outputs a voltage/current signal to an input channel; the digital multimeter receives the instruction to set the measurement as the voltage or current mode, measures the voltage or current signal output by an output channel and returns a measured value to a computer; the channel and voltage/current mode switching control plate switches a test channel and a voltage/current connection mode according to the instruction; and the communication interface transmits the parameter, the instruction and the test result between each device and a tested model. A computer reads the conversion value of the voltage or current measured value of the input channel through the communication interface or transmits a set numerical value to the output channel to convert the set numerical value into a voltage or a current.

Description

technical field [0001] The invention relates to a function and performance test of an analog module of a programmable logic controller (PLC), in particular to an automatic test system and method for the analog module of a programmable logic controller (PLC). Background technique [0002] The analog module of PLC is used to measure the input analog voltage / current and output the corresponding analog voltage / current according to the set value. The analog module generally contains multiple channels, and the channels are divided into two types: Input channels for inputting analog quantities and output channels for outputting analog quantities. The analog module mainly converts the external input analog voltage or current value into the corresponding value in linear proportion through the input channel and performs measurement, and converts the value set by the user into the corresponding analog voltage or current value in linear proportion through the output channel and output....

Claims

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Application Information

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IPC IPC(8): G01R35/00
Inventor 郭善伟陈海东
Owner SCHNEIDER ELECTRIC IND SAS
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