Reference MVI56E-MNETC/MNETCXT ♦ ControlLogix Platform
User Manual Modbus TCP/IP Client Enhanced Communication Module - Client/Server
Page 108 of 172 ProSoft Technology, Inc.
September 20, 2018
Status information transferred in the Read block can be viewed in the
MNETC.STATUS controller tag in the ladder logic. For more information, see the
Status Data Definition (page 93).
Write Block
These blocks of data transfer information from the ControlLogix processor to the
module.
The following table describes the structure of the output image.
Write Block from Processor to Module
Command bit data for Clients (set)
The Write Block ID is an index value used to determine the location in the
module’s database where the data will be placed. Each transfer can move up to
200 words (block offsets 1 to 200) of data.
Select Priority Read Block (Write Block Offset 247)
Note: The Select Priority Read Block feature is only available for firmware versions 1.36.000 and
higher.
This register allows the processor to select which read blocks will be returned
from the module. If this register equals zero, the module will return all read blocks
in sequential order.
If this register has a non-zero value, the module will return the read block
selected, and the following one.
This feature can be used for applications that require some read blocks to be
updated more frequently than other blocks.
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