MVI69E-MBS ♦ CompactLogix™ Platform
Modbus Serial Enhanced Communication Module
4.3
MBS Controller Tag Overview
This and the following sections describe the MBS controller tags in detail.
Tag Name
MBS.CONFIG
MBS.DATA
MBS.CONTROL
MBS.STATUS
MBS.UTIL
4.3.1 MBS.CONFIG
When ProSoft Configuration Builder (PCB) downloads the configuration file from the PC
to the processor, the processor stores the configuration file data in the
MBS.CONFIG.FileData array. Its CRC is also included in this array.
You cannot edit this array directly. You must use PCB to edit the module configuration
since PCB calculates a unique CRC to protect data integrity. Any change to the
configuration parameters directly in this array will not match the calculated CRC.
Tag Name
MBS.CONFIG.FileData
MBS.CONFIG.FileSize
MBS.CONFIG.FileCRC32
MBS.CONFIG.FileStatus
4.3.2 MBS.DATA
This structure contains the Read Data and Write Data arrays for processor-to-module
communication.
Tag Name
MBS.DATA.ReadData
MBS.DATA.WriteData
ProSoft Technology, Inc.
Description
Configuration information
MBS input and output data transferred between the processor
and the module
Governs the data movement between the PLC rack and the
module
Status information
Generic tags used for internal ladder processing (DO NOT
MODIFY)
Description
This parameter contains the MBS configuration data after it has
been downloaded from PCB. It is displayed in ASCII format.
Note: MBS configuration changes cannot be made directly in
this array; the configuration must be downloaded with PCB.
Configuration file size (MBS.CONFIG.FileData array) in bytes.
CRC checksum of the configuration file stored in the array.
Configuration file status. 0 = No file present, 1 = File present
Description
Data area copied from the module to the processor. This array
stores the Modbus data coming into the module from the Modbus
network.
Data area copied from the processor to the module. This array
stores the outgoing data sent from the module to the Modbus
network.
Using Controller Tags
User Manual
Page 58 of 159
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