6 creating a step7 program, 1 accessing a drive via opc, Creating a step7 program – Lenze Drive Server Bus server S7 getting started User Manual
Page 30: Accessing a drive via opc, Busserver s7
Busserver S7
L
91
Busserver S7 DE/EN 1.0
5.6
Creating a STEP7 program
The Lenze function blocks can be integrated in different ways. For a simple test, the blocks supplied
in the SIMATIC Manager can be copied from the library to a new project.
Note!
If you have configured drive controllers in your project which are temporarily disconnected from the
mains, please observe the following:
•
Drive controllers which are completely disconnected from the mains and are fully de-energised,
are no longer recognised as PROFIBUS devices by the PLC. This can be prevented by supplying
the function block/fieldbus module with an external voltage.
•
Instances of the
FB DRIVE for disconnected drive controllers have to be skipped in the PLC
program.
–
A query can be performed via the status words of the blocks
FC91, FC92, FC93 or FC94. If
the status word of these blocks indicates ”0”, the drive controller is not switched on (or not
available) and the corresponding
FB DRIVE instance must be skipped.
(
If an S7-300 is used, you can address drive controllers which are directly connected to the PROFIBUS
master of the CPU card and drive controllers which are connected with an external PROFIBUS
communication processor (CP).
•
For this, please use the block
FB DRIVE CP instead of the block FB DRIVE.
In the first step, communication is to be performed via OPC with only one drive connected to the
PROFIBUS master of the CPU.
5.6.1
Accessing a drive via OPC
Tip!
You can use the provided example programs for initial commissioning. In this case, you only have to
adapt the hardware configuration to your system environment.
(
If you want to create a program on your own, you simply have to integrate the supplied blocks into the
SIMATIC Manager.
Proceed as follows to create your own program:
1. Create a new project with the block
OB1.
2. Select
File
W
Open, click Libraries and select the LenzeDriveServer.
–
In the new window, you will find all blocks contained in the “LenzeDriveServer” library.
3. Simply drag and drop blocks
FB90, DB80 and DB81 into your new project .
4. Call an instance of
FB90 in OB1.
–
When programming in IL enter the following program code:
CALL FB90, DBxxx
(xxx represents a free data block number)
This call automatically creates the data block.
5. Edit the list of transfer parameters.
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