GE 369-C101 processor card

With the module configured as a master, you only need to enable these parameters to support a write to this type of addressing (Modbus FC 6 or 16). If the slave device shows addressing as shown in Example #2, then you need not do anything with the Float Flag, Float Start parameters, as they use two Modbus addresses to represent one floating point value:Because each 32 bit REAL value is represented by two Modbus Addresses (example 47101 and 47102 represent TEMP Pump #1), then you need not set the Float Flag, or Float Start for the module for Modbus FC 6 or 16 commands being written to the slave.

Configuring the Floating Point Data Transfer

 A common question when using the module as a Modbus TCP/IP client is how floating point data is handled. This really depends on the server device and how it addresses this application. Just because your application is reading/writing floating point data, does not mean that you must configure the Float Flag, Float Start parameters within the module. These parameters are only used to support what is typically referred to as Enron or Daniel Modbus, where one register address must have 32 bits, or one floating point value.

(Float specific module parameters)

 Float Flag: "Y" tells the Client to consider the data values that need to be sent to the Server as floating point data where each data value is composed of 2 words (4 bytes or 32 bits). Float Start: Tells the Client 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 Server. Otherwise the Client will ignore the "Float Flag: Y" and treat data as composed of 1 word, 2 bytes.

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