ProSoft Technology MVI71-MNET - Manual (Page 69)

Reference MVI71-MNET ♦ PLC Platform
User Manual Modbus TCP/IP Interface Module
ProSoft Technology, Inc.
Page 69 of 109
June 23, 2009
Side-Connect Backplane Data Transfer
The side-connect interface is the simplest method to implement the module. No
ladder logic is required for the interface because the driver handles data
movement between the module and the processor automatically. The data flow
diagram associated with this interface is shown in the following diagrams:
The configuration information for the module determines the size of the read and
write data areas and the locations of these data sets in the module’s internal
database. Therefore, to use this interface, just set up the files required by the
module. The following table lists the files required for the side-connect interface:
File Number Example Size Description
Cfg File N10 200 Control/Status File
Cfg File+1 N11 to 1000 Data transferred from the module to the processor
Other files for read data
Cfg File+1+n N12 to 1000 Data transferred from the processor to the module
Cfg File+1+n+m Other files for write data
n is the number of read data files minus one. Each file contains up to 1000
words.
m is the number of write data files minus one. Each file contains up to 1000
words.
The number of read and write files are dependent on the modules configuration.
Two examples follow: