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EATON MP3010 Operation panel

In many applications, it is necessary to read or write floating-point data to the device. The sample program only provides an INT array for the ReadData and Write Data array (16-bit signed integer value). In order to read/write floating-point data to and from the device, you must add additional ladder logic to handle the conversion of the data to a REAL data type within the FLEX processor. This is very easy to accomplish. The following topics show how to read or write data to a device. These topics also show when to use the Float Flag and Float Start parameters within the module configuration. For all applications, floating-point data can be read from a device without any changes to the Float Flag and Float Start parameters. You only need to configure these parameters to issue a Write command to a device that uses a single Modbus address, such as 47001, to represent a single floatingpoint value. The MVI94-MCM module can be used with many different processors. The following describes using the module with a ControlLogix processor.

Floating-Point Data Handling (Modbus Master) 

In many applications, it is necessary to read or write floating-point data to the Slave device. The sample program only provides an INT array for the ReadData and Write Data array (16-bit signed integer value). In order to read/write floatingpoint data to and from the Slave device, you must add additional ladder to handle the conversion of the data to a REAL data type within the ControlLogix processor. This is very easy to accomplish. The following topics show how to read or write data to a Slave device. These topics also show when to use the Float Flag and Float Start parameters within the module configuration. For all applications, floating-point data can be read from a device without any changes to the Float Flag and Float Start parameters. You only need to configure these parameters to issue a Write command to a device that uses a single Modbus address, such as 47001, to represent a single floating-point value

Flex I/O Platform

Along with the Function Code 3, DevAddress 256 will read Modbus address 40257 of the Slave device. The above command will read 40257 and 40258 of the Modbus Slave #1 and place that data in MCM.DATA.READDATA[0] and [1]. Within the controller tags section of the ControlLogix processor, it is necessary to configure a tag with the data type of "REAL" as shown in the following illustration. [+] Energy_Consumption REAL[1] Float Copy data from the MCM.DATA.READDATA[0] and [1] into the tag ENERGY_CONSUMPTION that has a data type of REAL. Use a COP statement within the ladder logic. Here is an example.

Because the tag MCM.DATA.READDATA[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.