Prosoft-technology 5204SE-MNET-PDPMV1 Manual de usuario descargar pdf (Pagina 161)

Reference 5204SE-MNET-PDPMV1 ♦ ProLinx Gateway

User Manual Modbus TCP/IP to PROFIBUS DP-V1 Pass-Through Master

ProSoft Technology, Inc. Page 161 of 235

December 22, 2009

4.5.5 Sample Control and Sequencing Logic for Cyclic Data Polling -

Quantum

Here is a structured text (ST) logic example of how you might control and

sequence the PROFIBUS cyclic data DFBs. You may adapt this sample to fit

your application or you may choose to create your own control and sequencing

scheme that is more suitable for your specific needs.

For this example, start by creating two variables:

LastExecuted as type INT

Start as type BOOL

Then, you can use the following ST logic code. Each time you set the variable

Start equal to 1, it will begin executing a sequence to read cyclic inputs, write

cyclic outputs, get general gateway status, and get standard PROFIBUS slave-

specific diagnostic data. As long as Start remains equal to 1, this sequence will

roll-over and be repeated until interrupted by setting Start = 0.

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Prosoft-technology 5204SE-MNET-PDPMV1 Manual de usuario Pagina 161