ProSoft Technology inRax MVI69-101M User Manual page 84

MVI69-101M ♦ CompactLogix or MicroLogix Platform
IEC 60870-5-101 Master Communication Module
The following number of blocks would be transferred between the module and
the processor:
Read Blocks = 6 blocks
Write Blocks = 4 blocks
Note: when Block Transfer Size parameter is configured for 120 or 240 words the actual number of
data words is less than the block size. Refer to the tables in this section for the actual number of
data words transferred in each read and write blocks.
Refer to Module Configuration
used with the blocks and the ladder logic required. The structure and function of
each block is discussed in the following topics.
Read Block
These blocks of data transfer information from the module to the processor. The
structure of the input image used to transfer this data depends on the block
transfer size configured by the user, as shown in the following tables:
Block Transfer Size = 60 Words
Offset
0
1
2 to 61
Block Transfer Size = 120 Words
Offset
0
1
2 to 121
Block Transfer Size = 240 Words
Offset
0
1
2 to 241
Note: Offset and length are given as words.
The Read Block ID is an index value used to determine the location where the
data will be placed in the processor controller tag array read data. The maximum
amount of data that each transfer can move will depend on the block transfer
size as follows:
Block Transfer Size = 60 => Read Data Count per Block = 60 words
Block Transfer Size = 120 => Read Data Count per Block = 88 words
Block Transfer Size = 240 => Read Data Count per Block = 193 words
Page 84 of 133
(page 19) for a description of the data objects
Description
Read Block ID (1 to 67)
Write Block ID (1 to 67)
Read Data
Description
Read Block ID
Write Block ID
Read Data
Description
Read Block ID
Write Block ID
Read Data
Length
1
1
60
Length
1
1
120
Length
1
1
240
ProSoft Technology, Inc.
February 4, 2008
Reference