ProSoft MVI56E-MNETCR User Manual page 109

MVI56E-MNETCR ♦ ControlLogix Platform
Modbus TCP/IP Multi-Client Enhanced Communications Module for Remote Chassis
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
0
1 to 40
41
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
40 words (block offsets 1 to 40) of data.
Status Block
This block contains status information about the module and is routinely copied
from the module into the MNETCR.STATUS controller tag array in the sequence
of normal data transfer blocks. A Status block has a Block ID of 0 or -1,
distinguishing it from Read or Write blocks.
Status Block from Module to Processor
Word Offset
0
1
2 to 7
8 to 37
38 to 40
41
Status information transferred in the Status block can be viewed in the
MNETCR.STATUS controller tag in the ladder logic. For more information, see
the Status Data Definition (page 97).
Additional Client status data is transferred in the Client Status blocks (page 113).
The contents of these blocks are also displayed in the Status Data Definition.
ProSoft Technology, Inc.
Description
Write Block ID
Write Data
Spare
Description
Write Block ID
Program Scan Counter
Block Transfer Status: Read, Write, Parse, Event
Command, Command Control, and Error Block Counts
Client 0 to Client 29 Command Execution Control Bits
Reserved
Read Block ID (-1 or 0)
Reference
User Manual
Length
1
40
1
Length
1
1
6
2
17
1
Page 109 of 161