Installing and Configuring the Module
MVI56-DEM
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ControlLogix Platform
Honeywell DE Communication Module
ProSoft Technology, Inc.
Page 23 of 80
March 6, 2008
Backplane Object (DEMBackplane)
The DEMBackplane object stores all the variables required for the data transfer
operation between the module and the controller. The LastRead data member is
used as the handshaking byte to indicate the arrival of new data from the
module. The ch1 and ch2 members are use to hold the computed channel
numbers received in a read block. These values are used as index values into
the read data arrays to determine where the data is stored. The structure of this
object is shown in the following illustration:
Real-time Object (DEM_Read_Realtime)
The DEM_Read_Realtime object holds the real-time data collected by the
module from the DE instruments. The structure of this object is shown in the
following example:
