5 Application example
5.5 Access to cyclic process data
102
DX-NET-PROFINET2-2
01/22 MN040062EN
www.eaton.com
5.5 Access to cyclic process data
In this example, “Standard Telegram 1” (PROFIdrive) is selected for cyclic
communication between the PLC and the variable frequency drive.
The PLC sends the control word and the speed setpoint to the variable
frequency drive using the SINA_SPEED function block.
The variable frequency drive then sends the status word and the actual value
(frequency) back to the PLC. Control and status data are thereby processed
as per the PROFIdrive profile.
The following data exchange takes place in this example:
Input process data
Two input process data are available
•
Control word
•
Frequency reference
Output process data
Two output process data are available:
•
Status word
•
Actual frequency
5.6 Access to acyclic process data
In this example, function block FB 286 is used to read or change the parame-
ters.
￫
The corresponding index numbers can be found in
section 4.12.3, “Parameter list”, page 63.
The parameter table contains specific data for each parameter.
