ProSoft Technology MVI94-MCM-MHI - Manual (Page 30)

Configuration MVI94-MCM ♦ Flex I/O Platform
User Manual Serial Communications Modbus Communication Module
Page 30 of 109 ProSoft Technology, Inc.
March 29, 2011
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 MCM.DATA.R EAD D ATA array. You
must not use addresses 1000 to 1013 in the IntAddress field for any other Modbus Master
commands.
The COP statement for this type of data is the same as shown in Read Multiple
Floating-Point Registers (page 28).