ProSoft Technology MVI69-DFCM - Manual (Page 35)

Ladder Logic MVI69-DFCM ♦ CompactLogix or MicroLogix Platform
DF1 Interface Module
ProSoft Technology, Inc. Page 35 of 117
November 3, 2008
3 Ladder Logic
In This Chapter
™ Module Data Object (DFCMModuleDef)................................................ 35
™ Adding the Module to an Existing CompactLogix Project ...................... 38
™ Adding the Module to an Existing MicroLogix Project............................ 42
Ladder logic is required for application of the MVI69-DFCM module. Tasks that
must be handled by the ladder logic are module data transfer, special block
handling and status data receipt. Additionally, a power-up handler may be
needed to handle the initialization of the module's data and to clear any
processor fault conditions.
The sample ladder logic, on the ProSoft Solutions CD-ROM, is extensively
commented, to provide information on the purpose and function of each rung. For
most applications, the sample ladder will work without modification.
3.1 Module Data Object (DFCMModuleDef)
All data related to the MVI69-DFCM is stored in a user defined data type. An
instance of the data type is required before the module can be used. This is done
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 table.
Name Data Type Description
BlockTransferSize INT 60, 120 or 240
ReadData INT[720] Data read from MVI69-DFCM
WriteData INT[720] Data written to MVI69-DFCM
BP DFCMBackplane Variables for BP logic
ModuleStatus DFCM_STATUS Module Status
BlockRequest DFCMBlockRequest Bits to request special blocks
ReadClock DFCMClock Time read from MVI69-DFCM
WriteClock DFCMClock Time written to MVI69-DFCM
CommandControl DFCMCommandControlPorts Used for Command Control operation
EventCommand DFCMEventCommandPorts Used for Event Command operation
SlavePollingControl DFCMSlavePollingControlPorts Slave polling control
SlaveStatus DFCMSlaveStatusPorts Status codes for each slave
This object contains objects that define the configuration, user data, status and
command control data related to the module. Each of these object types is
discussed in the following topics of the document.