MVI56-DEM
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ControlLogix Platform
Installing and Configuring the Module
Honeywell DE Communication Module
Page 22 of 80
ProSoft Technology, Inc.
March 6, 2008
2.1 Module
Configuration
This section contains the setup procedure, data, and ladder logic for successful
application of the MVI56-DEM module. Each step in the setup procedure is
defined in order to simplify the use of the module.
2.1.1 Module Data (DEMModule)
All data related to the MVI56-DEM is stored in a user-defined data type. An
instance of the data type is required before the module can be used. This is
accomplished by declaring a variable of the data type in the Controller Tags Edit
Tags dialog box. The structure of the object is displayed in the following example:
This object contains objects that define variables to be used with the module and
status data related to the module. Each of these object types are discussed in
the following topics of the document.
The Upload member of this object holds the bits to trigger the upload process.
This process copies the data read from the specific channel to the write data
area. This process is valuable for removing data mismatch errors and for
synchronizing the read and write data. Each bit in the array corresponds to an
individual channel with bit 0 corresponding to channel 1 and bit 15 corresponding
to channel 16. Review the example ladder logic for the upload function in this
manual to see how these bits can be utilized.
The Download member of this object holds the bits to trigger the download
process. This process forces a value of one into the function member of the write
data for the specific channel. After the function is executed, the function code
should be reset to zero to prevent the command from constantly executing. This
process is used to alter the configuration data in the specific instrument. Each bit
in the array corresponds to an individual channel with bit 0 corresponding to
channel 1 and bit 15 corresponding to channel 16. Review the example ladder
logic for the download function in this manual to see how these bits can be used.
