SK-G9-GDB1-D292 347594-A01 Main control board

(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.

(Modbus Command parameters) 

DB Addr - Tells the Master where in its data memory is the beginning of data to obtain and write out to the Slave (slave) device. Reg Count - Tells the Master how many data points to send to the Slave. Two counts will mean two floating points with Float Flag: Y and the "Addr in Dev" => the "Float Start" Parameter. Swap Code - Tells the Master how to orient the Byte and Word structure of the data value. This is device dependent. Check Command Entry formats Section. Func Code - Tells the Master to write the float values to the Slave. FC16. Addr in Dev - Tells the Master where in the Slave's database to locate the data. In the above example, the Master's Modbus command to transmit inside the Modbus packet will be as follows.

In this example

 the Master's Modbus packet contains the data byte and data word counts that have been doubled from the amount specified by Reg Count due to the Float flag set to Y. Some Slaves look for the byte count in the data packet to know the length of the data to read from the wire. Other slaves know at which byte the data begins and read from the wire the remaining bytes in the packet as the data the Master is sending.

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