ProSoft Technology MVI56E-MNETC - Manual (Page 116)

Guide to the MVI56E-MNETC User Manual MVI56E-MNETC ♦ ControlLogix Platform
User Manual Modbus TCP/IP Client Enhanced Communication Module
Page 116 of 183 ProSoft Technology, Inc.
February 3, 2013
Word Offset Content Description
210 to 238 Client 1 to Client 29
command execution words These 29 words are used for each of the other 29
Clients in the module. This data is set in the output
image (WriteBlock) from the ladder logic.
239 to 240 Product Code The product ID code for the module
241 Product Version The firmware version number for the module
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 102).
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
Word Offset Description Length
0 Write Block ID: -1 to 50 1
1 to 200 Write Data 200
201 to 230 Command bit data for Clients (set) 30
231 to 246 Spare 16
247 Select Priority Read 1
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 newer.
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.