Prosoft-technology MVI56-DFCMR Manual de usuario descargar pdf (Pagina 37)

Ladder Logic MVI56-DFCMR ♦ ControlLogix Platform

DF1 Interface Module with Reduced Data Block

ProSoft Technology, Inc. Page 37 of 113

October 20, 2008

3 Ladder Logic

In This Chapter

 Configuration Objects............................................................................ 37

 Module Data Object (DFCMModuleDef)................................................ 41

 Status Object (DFCMInStat)..................................................................42

 User Data Objects .................................................................................43

 Slave Polling Control and Status ...........................................................43

Ladder logic is required for application of the MVI56-DFCMR 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 Configuration Objects

Configuration of the module is performed by filling in the values in the module

object defined in the Controller Tags Edit Tags dialog. Each parameter required

by the module has a defined location in the object. The tables and discussions

below describe the parameters set in the dialog box. You can view these tables

by opening the data type under the User Defined Data Type option in the

Controller Organization window.

3.1.1 Data Transfer Parameters (DFCMModule)

Name Data Type Description

WriteStartReg INT Start reg to transfer from PLC to module

WriteRegCnt INT Number of registers to write from PLC

ReadStartReg INT Start reg to transfer from module to PLC

ReadRegCnt INT Number of registers to transfer from module

BPFail INT

Determines module operation if BP fails

0=continue,>0=number of retries before comm shutdown

ErrStatPtr INT Internal DB start register for status data (-1=Ignore)

This object defines the parameters for data movement between the module and

the processor. Values entered determine the ladder logic and data size required

in the application. The ReadData and WriteData arrays must be sized to or larger

than the count values entered. The ladder logic must process the number of

blocks of data to be transferred.

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Prosoft-technology MVI56-DFCMR Manual de usuario Pagina 37