ProSoft MVI56E-MNETCR, Руководство пользователя

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MVI56E-MNETCR ♦ ControlLogix Platform Reference
Modbus TCP/IP Multi-Client Enhanced Communications Module for Remote Chassis User Manual
ProSoft Technology, Inc. Page 107 of 161
All data transferred between the module and the processor over the backplane is
through the input and output images. Ladder logic must be written in the
ControlLogix processor to interface the input and output image data with data
defined in the controller tags. All data used by the module is stored in its internal
database. This database is defined as a virtual Modbus data table with
addresses from 0 (40001 Modbus) to 4999 (45000 Modbus).
Module’s Internal Database Structure
5000 registers for user data 0
Register Data
4999
Data contained in this database is transferred in blocks, or pages, using the input
and output images. ControlLogix ladder logic and the MVI56E-MNETCR
module's program work together to coordinate these block transfers. Up to 40
words of data can be transferred from the module to the processor (read block -
input image) or from the processor to the module (write block - output image) in
each block transfer. The block structure of each block type depends on the data
content and the data transfer function to be performed by the block. The module
uses the following block identification numbers.
Block Range Descriptions
-1 Null block
0 Null block
1 to 125 Read or Write blocks
1000 to 1124 Initialize Output Data blocks
2000 to 2029 Event Command blocks
3000 to 3029 Client Status blocks
5001 to 5016 Command Control blocks
9990 Set Module IP Address block
9991 Get Module IP Address block
9998 Warm-boot block
9999 Cold-boot block
These block identification codes can be broken down into two groups:
Normal data transfer blocks

Status, Read and Write blocks (-1 to 125)
Special function blocks

Initialize Output Data blocks (1000 to 1124)

Event Command blocks (2000 to 2029)

Client Status blocks (3000 to 3029)

Command Control blocks (5001 to 5016)

Module IP Address blocks (9990 and 9991)

Warm-boot and Cold-boot blocks (9998 and 9999)