ST51A/ST75A/ST75AV Flow Meters 06EN003426 Rev. C
Fluid Components International LLC v
Modbus Operation ........................................................................................................................................................................... 56
Setting Up the ST51A/ST75A/ST75AV for Modbus Operation ............................................................................................... 56
ST51A/ST75A/ST75AV Modbus Commands .......................................................................................................................... 57
ST51A/ST75A/ST75AV Process Data Registers .................................................................................................................... 57
Totalizer Register Description ................................................................................................................................................. 58
ST51A/ST75A/ST75AV Modbus Service Registers ................................................................................................................ 59
Examples of Totalizer Service Register Access using ModScan32 ........................................................................................ 59
Checking the Totalizer Value .......................................................................................................................................... 59
Resetting the Totalizer Value .......................................................................................................................................... 61
Starting/Stopping the Totalizer Count ............................................................................................................................. 61
Checking K Factor Values ............................................................................................................................................... 62
Changing/Setting K Factor Values .................................................................................................................................. 62
Modbus Engineering Units Codes Table ................................................................................................................................. 64
Modbus Device Status Code Table ......................................................................................................................................... 64
4 MAINTENANCE .............................................................................................................................................................................. 65
Calibration ....................................................................................................................................................................................... 65
Electrical Connections ..................................................................................................................................................................... 65
Remote Enclosure ........................................................................................................................................................................... 65
Electrical Wiring .............................................................................................................................................................................. 65
Flow Element Connections ............................................................................................................................................................. 65
Flow Element Assembly .................................................................................................................................................................. 65
5 TROUBLESHOOTING .................................................................................................................................................................... 67
Application Verification .................................................................................................................................................................... 67
Equipment Needed ......................................................................................................................................................................... 67
Check Serial Numbers .................................................................................................................................................................... 67
Check the Instrument Installation .................................................................................................................................................... 67
Check for Moisture .......................................................................................................................................................................... 67
Check Application Design Requirements ........................................................................................................................................ 67
Verify Standard Versus Actual Process Conditions ........................................................................................................................ 67
Verifying Calibration Parameters (Diagnostics) .............................................................................................................................. 68
Hardware Verification ...................................................................................................................................................................... 69
Fuse Check ............................................................................................................................................................................. 69
Sensor Check .......................................................................................................................................................................... 69
Transmitter Circuit Calibration Check (Delta R Verification) ........................................................................................................... 70
References .............................................................................................................................................................................. 70
Equipment ............................................................................................................................................................................... 70
Procedure ................................................................................................................................................................................ 70
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