Prosoft-technology 5204SE-MNET-PDPMV1 Uživatelský manuál stáhnout pdf (Strana 113)

Reference 5204SE-MNET-PDPMV1 ♦ ProLinx Gateway

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

ProSoft Technology, Inc. Page 113 of 235

December 22, 2009

4.4.5 Sample Control and Sequencing Logic for Cyclic Data Polling -

M340

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.

1 2 ... 108 109 110 111 112 113 114 115 116 117 118 ... 234 235

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Prosoft-technology 5204SE-MNET-PDPMV1 Uživatelský manuál Strana 113