ProSoft Technology MVI69-101S - Manual (Page 77)

Reference MVI69-101S ♦ CompactLogix or MicroLogix Platform
IEC 60870-5-101 Slave Communication Module
ProSoft Technology, Inc. Page 77 of 149
March 16, 2009
The processor inserts data into the module's output image to transfer to the
module. The module's program extracts the data and places it in the module's
internal database. The output image for the module is suser-configurable at 60,
120 or 240 words.. This large data area permits fast throughput of data from the
processor to the module
The following illustration shows the data transfer method used to move data
between the CompactLogix or MicroLogix processor, the MVI69-101S module
and the IEC 60870-5-101 network.
All data transferred between the module and the processor over the backplane is
through the input and output images. Ladder logic must be written in the
CompactLogix or MicroLogix processor to interface the input and output image
data with data defined in the Controller Tags. All data used by the module is
stored in its internal database. The following illustration shows the layout of the
database:
Module's Internal Database Structure
5000 registers for user data 0
Register Data
4999