ProSoft Technology MVI56E-MCM/MCMXT - Manual (Page 51)

MVI56E-MCM ♦ ControlLogix Platform Configuration as a Modbus Master
Modbus Communication Module User Manual
ProSoft Technology, Inc. Page 51 of 199
June 18, 2014
2.4.5 Write to Enron/Daniel Floats
To issue a Write command to Enron/Daniel Floats, use the Float Flag and Float
Start parameters within the ModDef controller tags.
The following table describes the addresses that will be written to by the module.
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
Configure the Float Start and Float Flag parameters as shown.
The Float Flag causes the module to use the FloatStart parameter to determine
which DevAddress requires a write command to issue double the number of
bytes.
With the above configuration, any DevAddress > 7000 is known to be floating-
point data. Therefore, a count of 1 will send 4 bytes of data, instead of the normal
2 bytes of data to a non Enron/Daniel floating-point register.
1 First, copy the floating-point data from the ControlLogix processor into the
MCM.DATA.W RITE D ATA array used by the MVI56E-MCM module. Below is
an example.
2 The length of this COP statement must now be 14. This will COP as many of
the MCM_F LOAT _D ATA values required to occupy the
MCM.D ATA .W RITE D ATA array for a length of 14. This will take 7 registers,
MCM_F LOAT _D ATA [0] TO [6], and place that data into
MCM.DATA.W RITE D ATA [0] TO [13].