MVI56-DNP
♦
ControlLogix Platform
Reference
DNP 3.0 Server
User Manual
ProSoft Technology, Inc.
Page 113 of 171
July 21, 2011
Write Block
WRITE blocks transfer information from the ControlLogix processor to the
module. The following table describes the structure of a typical output image
Write Block.
Block Offset
Content
0
Write block ID
1 to 240
Write data
241 to 247
Spare (Not used)
The
Write Block ID
is an index value used to determine the location in the
module’s database where the data will be placed as defined in the table
presented in the previous section. Each transfer can move up to 240 words
(block offsets 1 to 240) of data.
In cases where the ladder logic uses Special Function Blocks, the normal
Read
Block IDs
and
Write Block IDs
will be replaced with a
Special Function Block ID
.
Once the Special Function has been processed, the module will resume the
normal data
Read Block ID
and
Write Block ID
sequence, starting from where the
sequence was interrupted.