Field bus based thermocouple measurement module and measurement method thereof

Abstract

The invention provides a field bus based thermocouple measurement module and a measurement method thereof. The thermocouple measurement module comprises a processor, an Ethernet switch, a power supplymodule and a bus isolation unit. The processor is electrically connected with the Ethernet switch, the power supply module and the bus isolation unit. One path of the Ethernet switch is electricallyconnected with the Ethernet connector LINK1 after passing an isolation transformer, the bus isolation unit is electrically connected with a multipath analog switch through an analog-to-digital converter, and the multipath analog switch is electrically connected with an IO interface connector sequentially through a low-pass filter circuit and an overvoltage protection circuit. All measurement portsof the module can be configured at will for thermal resistance RTD and thermocouple TC measurement, a standard Ethernet industrial protocol is integrated, the module is especially suitable for a large data volume transmission and real-time control temperature measurement system, rapid networking and system expansion of an industrial field are facilitated, and different requirements of customers are met.

Description

technical field [0001] The invention relates to the field of industrial buses, in particular to a field bus-based thermocouple measurement module and a measurement method thereof. Background technique [0002] High-precision temperature measurement is a critical parameter in industrial automation applications. In the field of industrial temperature measurement applications, equipment needs to adapt to harsh working conditions, and temperature acquisition requires a wide range of temperature measurement, fast sampling speed, and high accuracy. Different customers use different temperature sensors (TC or RTD sensors) and different wiring methods (such as 2 / 3 / 4 wires) in the field application. It is difficult for the current temperature acquisition module to meet these different measurement requirements at the same time; at the same time, some products It does not have a standard industrial bus protocol, does not meet the transmission of large amounts of data, and is inconveni...

AI Technical Summary

Problems solved by technology

Different customers use different temperature sensors (TC or RTD sensors) and different wiring methods (such as 2 / 3 / 4 wires) in the field application. It is difficult for the current temperature acquisition module to meet these different measurement requirements at the same time; at the same time, some products Does not have a standard industrial bus protocol, does not meet the transmission of large amounts of data, and is inconvenient for industrial networking

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