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Application of MODBUS protocol in Oil-Field Monitor and Control System

Lian Ya-nan

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Abstract

MODBUS protocol based on ASCII mode was adopted in Oil Transferring Station System, The communication between PLC and STC-1 was realized with polling STC-1 data in order. According to the command of upper PC, the corresponding data was sent to RS485 bus the lower PC. Then, element address in data frame was compared with local address by using the STC-1 data acquisition module, then return information to PLC if address match. Dispatching software of PC was programmed by VB, the communication between CP340 and STC-1 for data collection module of reheating furnace was controlled, and converted the data of ASCII format to correspond temperature value.

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What this paper is about

MODBUS protocol based on ASCII mode was adopted in Oil Transferring Station System, The communication between PLC and STC-1 was realized with polling STC-1 data in order. According to the command of upper PC, the corresponding data was sent to RS485 bus the lower PC. Then, element address in data frame was compared with local address by using the STC-1 data acquisition module, then return information to PLC if address match. Dispatching software of PC was programmed by VB, the communication between CP340 and STC-1 for data collection module of reheating furnace was controlled, and converted the data of ASCII format to correspond temperature value.

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Available abstract

MODBUS protocol based on ASCII mode was adopted in Oil Transferring Station System, The communication between PLC and STC-1 was realized with polling STC-1 data in order. According to the command of upper PC, the corresponding data was sent to RS485 bus the lower PC. Then, element address in data frame was compared with local address by using the STC-1 data acquisition module, then return information to PLC if address match. Dispatching software of PC was programmed by VB, the communication between CP340 and STC-1 for data collection module of reheating furnace was controlled, and converted the data of ASCII format to correspond temperature value.

Key concepts: Modbus, ASCII, Polling, Frame (networking), Protocol (science), Software, SCADA, Data acquisition

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