5 Functional Mechanisms of this Application
5.1 Functionality of process data exchange
SINAMICS G120 DP at S7-1200
Entry-ID: 70155469, V1.4, 07/2018
Siemens AG 2018 All rights reserved
5.1.2 Standardizing the setpoint and actual values
The setpoint and actual values are transferred as standards. The standardization
and reference values are stored in parameters P2000 to P2006 of the SINAMICS
G120.
16384dec = 4000
hex
= 100% applies here, with 100% referring to the reference
value for the transferred variable.
Example:
If P2000 (reference speed or reference frequency) is 1500 rpm and run at a
speed of 500 rpm, then 33% or 5461
Dec
must be transferred.
Normalizing and denormalizing is performed in FC11 and FC12 in the application
example.
For more information, please refer the function manual “Fieldbus system” (/6/).
5.1.3 Transfer method
To copy the process data into or from the I/O area, the following instructions
DPRD_DAT and DPWR_DAT are used:
These instructions ensure that the consistency is maintained across the entire
process data, i.e. all elements of the process data of a slave are from the same bus
cycle or are transferred within a bus cycle. This is necessary, e.g. to enable a
distributed synchronization. In the example program, all of the 6 words are copied
consistently.
In the “Instructions” task card of the TIA Portal you will find the instructions under
> Expanded instructions
> Distributed I/Os
> Others
To Next Page
Loading...
Need help?
General