ProSoft Technology MVI71-GEC - Manual (Page 61)

MVI71-GEC ♦ PLC 5 Platform Reference
Generic ASCII Ethernet Communication Module User Manual
ProSoft Technology, Inc. Page 61 of 86
May 11, 2011
Side-Connect Backplane Data Transfer
The side-connect interface is the simplest method to implement the module.
Minimal ladder logic is required for the interface because the driver handles data
movement between the module and the processor automatically. Additionally,
this interface is much faster than the block transfer interface. The data flow
associated with this interface is shown in the following diagram:
The value found in the SC_DATA.TXT file on the module determines the starting
file number for the side-connect interface. The following table lists the files
required for the side-connect interface:
File Number Example Size Description
Cfg File N10 250 Data transferred from the processor to the module
Cfg File+1 N11 250 Data transferred from the module to the processor
The first file is used by the module to read data placed in the file by the
processor. The second file places received data from the network into the
processor. It is very important that these files be defined to prevent the processor
from faulting.