Reference MVI56E-MNETC/MNETCXT ♦ ControlLogix Platform
User Manual Modbus TCP/IP Client Enhanced Communication Module - Client/Server
Page 126 of 172 ProSoft Technology, Inc.
September 20, 2018
Unformatted Pass-Through Block (9996)
When the unformatted pass-through mode (code 1) is selected, information is
passed from the module to the processor with a block identification code of 9996.
Word 2 of this block contains the length of the message, and the message starts
at word 3. Other controller tags are required to store the controlled values
contained in these messages.
Pass-Through Block 9996 from Module to Processor
Number of bytes in Modbus msg
The ladder logic copies and parses the received message, and controls the
processor as expected by the Client device. The processor responds to the pass-
through block with a write block.
Response Block 9996 from Processor to Module
This informs the module that the command has been processed and can be
cleared from the pass-through queue.
Set Module IP Address Block (9990)
Block Request from Processor to Module
First digit of dotted IP address
Second digit of dotted IP address
Third digit of dotted IP address
Last digit of dotted IP address
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