ProSoft Technology MVI56-103M - Manual (Page 103)

MVI56-103M ♦ ControlLogix Platform Reference
IEC 60870-5-103 Master Communication Module User Manual
ProSoft Technology, Inc. Page 103 of 152
February 22, 2013
5.3.2 Block Request from Processor to the Module
These blocks of data transfer information from the <Processor Model> to the
module. The following table describes the structure of the output image.
Offset Description Length
0 Write Block ID 1
1 to 200 Write Data 200
201 to 247 Spare 47
The Write Block ID code defines the content of the data area contained in the
block. If the code is set to -1 or 0, the data area contains no valid data. If the
word contains a value from 1 to 20, the data contained in the block will come
from the appropriate position of the module’s database. Under normal conditions,
the value used for the Write Block ID should be that received in the Read Block
from the module.