Prosoft-technology MVI69E-MBTCP Manual do Utilizador descarregar pdf (Página 121)

MVI69E-MBTCP ♦ CompactLogix Platform Reference

Modbus TCP/IP Enhanced Communication Module User Manual

ProSoft Technology, Inc. Page 121 of 150

May 20, 2015

7.3 Floating-Point Support

You can easily move floating point data between the MBTCP module and other

devices as long as the device supports IEEE 754 Floating Point format. This

IEEE format is a 32-bit single-precision floating-point format.

The logic necessary to move the floating-point data takes advantage of the COP

instruction in RSLogix 5000. The COP instruction is unique for data movement

commands in that it is an untyped function, meaning that no data conversion is

done when data is moved between controller tags with different data types (that

is, it is an image copy, not a value copy).

The COP instruction to move data from a floating-point controller tag into an

integer controller tag (something you would do to move floating-point values to

the module) is shown below.

This instruction moves one floating-point value in two 16-bit integer images to

MBTCP.DATA.WriteData[0], which is an integer tag. For multiple floating-point

values increase the Length field by a factor of 2 per floating-point value.

The COP instruction to move data from MBTCP.DATA.ReadData[0], which is an

integer tag, to a floating-point tag (something you would do to receive floating-

point values from the module) is shown below.

This instruction moves two 16-bit integer registers containing one floating point

value image into the floating-point tag. For multiple values increase the Length

field.

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