ProSoft Technology MVI94-MCM-MHI - Manual (Page 29)

MVI94-MCM ♦ Flex I/O Platform Configuration
Serial Communications Modbus Communication Module User Manual
ProSoft Technology, Inc. Page 29 of 109
March 29, 2011
Write Floats to Slave Device
To issue a Write command to Floating-Point addresses, use the configuration in
the following table. The table describes the Modbus Map for the Slave device.
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
You must use a COP statement to copy the data from floating-point data tags
within the ControlLogix processor, into the MCM.DATA.W
RITE D ATA
array used
by the MVI94-MCM module. Below is an example.
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].
You must configure the command to write all 7 floats (14 Modbus addresses) as
follows.
The above command will take the data from MCM.DATA.W
RITE D ATA [0] TO [13]
and write this information to the Slave device node #1 addresses 40261 to
40274.