Ametek AMEVision 3050-TE, User Manual

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Modbus Communication Interface
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A-5
HOLDING REGISTERS
Since the RAM space on the analyzers is limited and not every customer’s
DCS\SCADA\DAS\PLC supports Modbus floating point value transfer,
floating point values that are commonly accessed on a Model 3050 ana-
lyzer are scaled and converted into integer values to load into Modbus
registers for transmission. The register values need to be scaled back at
the receiving end to yield the actual values. The size of a Modbus holding
register is 16-bit which can assume a value from -32768 to +32767 in two’s
complement. The holding register definitions, units of measurement and
scaling factors are shown in the following table.