General Signal Flow Diagram
Flow compuer selection signal is sent from selection swithch of
Metering Panel to PLC. PLC controls MOV to perform auto swithcing by
refering to flowrates from selected flow computer. G/C controller sends
Gas composition data to flow compuer for volume correction and density
calculation. HMI PC communicates with each flow computers and saves
process data. G/C operation PC is used for monitoring chroatogram, G/C
status and G/C calibration.
General Application Software Configuration
Application
softwares consist of HMI, I/O Serverand Report Program. HMI program
communicates with Report Program by DDE. So HMI can print control of
Report Program like a automatic hourly,daily, monthly report print and
manual print. General MODBUS I/O Server only supports 32bit single
precision floating format. However MReport suports 64bit double precision floating format and directrly commuicate with flow computer.
HMI Example Screen and MReport Program
Following
example is orifice type station has 4 meter run. Each meter run has
MOV so that auto meter run switching or manual valve operation is
possible. Flow computer is hot/stand-by configuration. This natural gas
station has 1 G/C to send gas composition data to flow compuers.
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HMI Main Screen
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MReport Program
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