ProSoft Technology MVI71-MCM - Manual (Page 70)

MVI71-MCM ♦ PLC Platform Reference
Modbus Communication Module
Page 70 of 111 ProSoft Technology, Inc.
December 28, 2007
Side-Connect (Requires Side-Connect Adapter)
The ladder logic should copy the command control block to the side-connect data
file starting at register 80.
For example, if the user selected N10 as the side connect data file, the ladder
logic should move the command control block according to the following
structure:
Offset Data File
0 N10:80
1 N10:81
2 N10:82
3 N10:83
4 N10:84
5 N10:85
… …
63 N10:143
Event Command
Event command control blocks send Modbus commands directly from the ladder
logic to one of the master ports. This control block should be only be used under
special circumstances. Normally, the user should use the configuration command
list to send commands. The format for these blocks is displayed in the following
table:
Write Block
Offset Description Length
0 1000 to 1255 or 2000 to 2255 1
1 Internal DB Address 1
2 Point Count 1
3 Swap Code 1
4 Function 1
5 Device DB Address 1
6 to 63 Spare 57