Rockwell Automation 1404-M4_M5_M6_M8 Powermonitor 3000 User Manual, Firmware rev. 3.0 or LATER - Manual (Page 100)

100 Publication 1404-UM001F-EN-P - November 2009
Chapter 4 Communication
Once the message is assembled, your ladder program transfers the
integer file to the scanner module M0 file starting at word 224
(SLC 500 controller) or block transfers the 64-word integer file to the
scanner module (PLC-5 controller).
The ControlLogix controller includes in its instruction set a CIP
Generic message instruction that builds the transaction header and
path from information you enter into the message setup dialog in
RSLogix 5000 software.
Message Setup
The example above is a ControlLogix message instruction to read the
user-configured table, assembly instance 37.
Up to four concurrent explicit messaging connections are supported
by the DeviceNet communication port.
TIP
Because the floating-point word order in the ControlLogix controller is
reversed from the default DeviceNet floating-point word order setting
in the Powermonitor 3000 unit, your ladder logic will need to reverse
the word order so the data may be interpreted correctly. The SWPB
instruction performs this function. You may also select little-Endian
word order, however, this may be incompatible with RSPower and
RSEnergyMetrix software.