OPERATION ST51A/ST75A/ST75AV Mass Flow Meters
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Totalizer Register Description
The instrument’s Modbus interface offers the flow Totalizer value through two different register groups each providing a single precision
floating point data type. Register 5103 offers the flow Totalizer as a single precision floating point value in the Modbus Daniel extension
protocol. Registers 4105 and 4106 offer the flow totalizer as a single precision floating point value in the standard Modbus register form.
Table 20 – ST51A/ST75A/ST75AV Modbus Process Data
Process Variable Values – Daniel Extension
Process Variable Values – Integral Registers
1
Process Variables – Engineering Unit Codes
Totalizer Eng. Units Code
Totalizer Single Precision Floating Point – Service Registers
Notes: 1. Data Type: Special1 is a collection of discrete registers that contain a 32-bit floating point value, and must be
treated and interpreted as a floating point number by the DCS or the PLC.
Special2 is a collection of discrete registers that contain a 16-bit floating point value, and must be treated and
interpreted as a concatenated floating point number by the DCS or the PLC.
2. Refer to
Table 23, page 64 for status register bit assignment details.
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