ProSoft Technology MVI69-MCM - Manual (Page 62)

Configuring the MVI69-MCM Module MVI69-MCM ♦ CompactLogix or MicroLogix Platform
User Manual Modbus Communication Module
Page 62 of 167 ProSoft Technology, Inc.
March 22, 2011
Specific Example #1:Master is issuing Modbus command with FC 16 (with Float Flag: Yes)
to transfer Float data to Slave.
(Float specific module parameters)
Float Flag: "Y" tells the Master to consider the data values that need to be sent
to the Slave as floating point data where each data value is composed of 2 words
(4 bytes or 32 bits).
Float Start: Tells the Master that if this address number is <= the address
number in "Addr in Dev" parameter to double the byte count quantity to be
included in the Command FC6 or FC16 to be issued to the Slave. Otherwise the
Master will ignore the "Float Flag: Y" and treat data as composed of 1 word, 2
bytes.