Prosoft-technology MVI56E-MCMR Manual de usuario descargar pdf (Pagina 78)

Configuring the MVI56E-MCMR Module MVI56E-MCMR ♦ ControlLogix Platform

User Manual Modbus Communication Module with Reduced Data Block

Page 78 of 225 ProSoft Technology, Inc.

May 13, 2014

Read Floats with Single Modbus Register Address (Enron/Daniel Float)

Some Modbus slave devices use a single Modbus address to store 32 bits of

data. This type of data is typically referred to as Enron or Daniel Floating-Point.

A device that uses this addressing method may have the following Modbus

Memory Map.

Address

Data Type

Parameter

47001

32 bit REAL

Demand

47002

32 bit REAL

Reactive Power

47003

32 bit REAL

Apparent Power

47004

32 bit REAL

Power Factor

47005

32 bit REAL

Voltage: Line to Line

47006

32 bit REAL

Voltage: Line to Neutral

47007

32 bit REAL

Current

This type of device uses one Modbus address per floating-point register. To read

these values from the Slave device, configure the following command within the

module.

Notice that the count is now set to a value of 7. Because the Slave device utilizes

only 7 Modbus addresses, a count of 7 will cause the Slave to respond with 14

registers (28 bytes) of information.

Important: This command will still occupy 14 register within the MCMR.DATA.READDATA array.

You must not use addresses 1000 to 1013 in the Internal Address field for any other Modbus

Master commands.

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Prosoft-technology MVI56E-MCMR Manual de usuario Pagina 78