Natural gas pipeline flowmeter PLC communication system design

1 introduction with the operation of domestic natural gas project put into production, more perfect of large infrastructure, especially the west-east gas one line, two line large long-distance pipeline construction, such as rapid growth of gas consumption, gas utilization in China entered a new period of development. Is expected in the future with the diversification of supply air supply, gas supply pipe network, the coverage and utilization of natural gas fields will be more broad, will play a more important role in energy conservation and emissions reduction. In view of the natural gas is increasingly widely used, this paper mainly expounds the gas pipe flow meter data collection and PLC controller communication and data processing method. 2 with superior communication hardware configuration of PLC used in this article is rockwell company medium-sized PLC CompactLogix L33ER, communication module USES is Prosoft MVI69E - for the company MBS, gas flow meter used in the gas turbine flowmeter is zhejiang day letter. Among them, the PLC controller and flow meter adopts RS485 communication protocol for data acquisition, the gas flow meter test, such as temperature, pressure, the instantaneous flow and cumulative flow parameters to PLC controller, PLC and then transmitted to the station control system through Ethernet communication protocols. 2. 1 basic connection first, will be 24 v dc power flow meter power terminal, will be double RS485 communication terminal receiving flowmeter. Then set the meter communication protocol. Coding system: 8 bit binary, each 8-bit bytes in the packet contains two four hexadecimal character ( 0 - 9、A- F) Baud rate: 9600 BPS each byte: a start bit eight data bits, parity check 1 not stop a day letter meter register address ( 40002 - 400013 ( Decimal) ) And defined as shown in figure 1. （ Floating-point IEEE754 standard. The volume of total amount = 1000000 * high low total 4 + 6. ） Figure 1 meter address and definition 2. 2 MBS module software configuration ( 1) Set the MBS module: see shown in figure 2, first set the communication port of master-slave station and data types; Open the Prosoft configuration builder set the communication port, PLC relative to the flow meter is given priority to stand needs to be set for the master, parity, baud rate and so on need and flow meter. Figure 2 set of MBS module ( 2) 1 set of MBS communication port protocol: see shown in figure 3, click MBS port 1 open Settings interface, communication protocol is Modbus Slave RTU parity, baud rate needs and parameters such as flow meter. Then you need to set up data type, can make, device address, etc. As a member, read on.
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