ProSoft Technology MVI56E-MCM/MCMXT - Manual (Page 48)

Configuration as a Modbus Master MVI56E-MCM ♦ ControlLogix Platform
User Manual Modbus Communication Module
Page 48 of 199 ProSoft Technology, Inc.
June 18, 2014
Copy data from the MCM.DATA.R EAD D ATA [0] and [1] into the tag
E NERGY _C ONSUMPTION that has a data type of REAL. Use a COP statement
within the ladder logic. Here is an example.
Because the tag MCM.DATA.R EAD D ATA [0] should only be used within the above
command, an unconditional COP statement can be used.
Notice the length of the COP statement is a value of 1. Within a Rockwell
Automation processor, a COP statement will copy the required amount of
"Source" values to fill the "Dest" tag for the Length specified.
Therefore, the above statement will copy ReadData[0] and [1] to fill the 32 bits
required for the tag "Energy_Consumption".
Note: Do not use a MOV statement. A MOV will convert the data from the Source register to the
destination register data type. This would create a data casting statement and will result in the loss
or corruption of the original data.
2.4.2 Read Multiple Floating-Point Registers
The following table is an example to read Multiple Floating-Point values and
device addresses. The table shows 7 consecutive floating-point values (14
Modbus addresses).
Value Description Type
40261 KW Demand (power) Float. upper 16 bits
40263 VAR Reactive Power Float. upper 16 bits
40265 VA Apparent Power Float. upper 16 bits
40267 Power Factor Float. upper 16 bits
40269 VOLTS Voltage, line to line Float. upper 16 bits
40271 VOLTS Voltage, line to neutral Float. upper 16 bits
40273 AMPS Current Float. upper 16 bits
Configure the command to read these 7 floats as follows.
Configure an array of 7 floats within the ControlLogix processor as shown in the
following illustration.