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Detailed explanation of ETU003 module telegraph unit

ETU003 module overview

The ETU003 module is an important communication module produced by Xiamen Haitong Huaye Technology Co., Ltd. This module is mainly used to effectively isolate analog signal lines and communication lines to ensure the stability and reliability of the system.

Technical characteristics

Signal line grounding method: The analog signal line of the ETU003 module should use single-ended grounding, while the communication line needs to use double-ended grounding. This approach can effectively prevent the negative terminal of the DC power supply from having any contact with the neutral line of the AC power supply or the earth, thereby avoiding possible interference.

Common-mode voltage interference protection: In particular, the 231-0HC or 235-0KD modules are susceptible to common-mode voltage interference. This interference can be effectively prevented by short-circuiting the input negative terminal of the signal to the negative terminal of 24VDC1.

CPU communication port design: The CPU communication port is a non-isolated port. When communicating with other devices (such as frequency converters), it is recommended to install a photoelectric isolator to improve the overall security of the system.

Application scenarios

The ETU003 module is widely used in multiple industrial automation fields due to its excellent performance and reliability, especially in scenarios that require highly reliable communication.

Comparison with other communication modules

ET200SP base unit

Compared with the ETU003 module, the ET200SP base unit also plays an important role in the field of industrial automation. ET200SP base units can be divided into multiple categories according to different functions, including A0, A1, etc. Each category has its specific application scenarios and advantages.

Functional classification

Class A0 BaseUnit: suitable for digital modules, communication modules and some analog modules.

Class A1 BaseUnit: with built-in temperature measurement function, suitable for analog modules.

Usage scenario examples

Digital input signals: Use a potential group.

Digital output signals: Use another potential group.

Power supply capability grouping: Group potential groups according to the power supply capability of BaseUnit to ensure stable operation of the system.

in conclusion

To sum up, the ETU003 module occupies a place in the field of industrial automation communication with its unique technical characteristics and wide range of application scenarios. Compared with the ET200SP base unit, both have their own advantages, and the selection needs to be comprehensively considered based on specific application requirements and environmental conditions.

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