ProSoft Technology MVI69-MCM - Manual (Page 60)

Configuring the MVI69-MCM Module MVI69-MCM ♦ CompactLogix or MicroLogix Platform
User Manual Modbus Communication Module
Page 60 of 167 ProSoft Technology, Inc.
March 22, 2011
Floating Point Support
The movement of floating point data between the MCM module and other
devices is easily accomplished as long as the device supports IEEE 754 Floating
Point format. This IEEE format is a 32-bit single precision floating point format.
The programming necessary to move the floating point data takes advantage of
the CPS command that exists in the Compact Logix and SLC processors. The
CPS command is unique for CPX/SLC data movement commands in that it is an
untyped function, meaning that no data conversion is done when moving data
between file types (that is, it is an image copy not a value copy).
The structure of the CPS command to move data from a Floating Point file into
an integer file (something you would do to move floating point values to the
module) is as follows:
This command will move one floating point value in two 16 bit integer images to
the integer file. For multiple floating point values increase the count field by a
factor of 2 per floating point value.
The structure of the COP command to move data from an Integer file to a
Floating Point file (something you would do to receive floating point values from
the module) is as follows:
This command will move two 16 bit integer registers containing one floating point
value image to the floating point file. For multiple values increase the count field.