Configuration as a Modbus Master MVI56-MCM ♦ ControlLogix Platform
Modbus Communication Module
ProSoft Technology, Inc. Page 43 of 159
July 24, 2008
The length of this COP statement must now be 14. This will COP as many of the
MCM_Float_Data values required to occupy the MCM.Data.WriteData array for a
length of 14. This will take 7 registers, MCM_Float_Data[0]-[6], and place that
data into MCM.DATA.WriteData[0]-[13].
The command to write all 7 floats (14 Modbus addresses) must be configured as
follows.
The above command will take the data from MCM.DATA.WriteData[0]-[13] and
write this information to the slave device node #1 addresses 40261 to 40274.
4.4.4 Read Floats with Single Modbus Register Address
(Enron/Daniel Float)
Some Modbus slave devices will utilize one Modbus address to store 32 bits of
data. This is typically referred to as Enron or Daniel Floating Point.
A device that utilizes 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, the following command can be setup within
the module.
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