Rockwell Automation 20D PowerFlex 700S with Phase I Control Reference Manual - Manual (Page 41)

Rockwell Automation Publication PFLEX-RM002D-EN-E - August 2013 41
Detail Drive Configuration and Operation Chapter 1
Figure 6 - Reading Floating-Point Datalink in a SLC/PLC-5
Figure 7 - Writing Floating-Point Block Datalinks in a SLC/PLC-5
Explicit Messaging
Explicit messaging is used to configure the drive and monitor data from the drive.
Chapter 6 of the
20-COMM-D User Manual shows the format of the explicit
message request and response data in an SLC and PLC-5.
Because the SLC/PLC-5 does not support 32-bit integers, 32-bit integer data
from the explicit message request and response data remains split into (2) 16 bit
integers. In order to send or receive floating-point data the Least Significant
Word (LSW) and Most Significant Word (MSW) must be swapped and the
COP (copy) instruction must be utilized. The following examples are for
transmitting and receiving floating-point data for explicit messages.