Lenze Drive Server Bus server S7 getting started - Manual (Page 23)

Busserver S7
L
84 Busserver S7 DE/EN 1.0
5 Creating a STEP7 project
5.1 Overview of the STEP7 blocks
The following figure gives you an overview of the different STEP7 blocks:
FB DRIVE
DB OPC
PROFIBUS-DP
PA PE
DB S7PAR
S7
PA PE
Parameter data channel
Process data channel
Drive 1
OPC via
S7 protocol
FC
parameter
FC
process
data
Symbolic
block name
Block number Function
FB DRIVE FB 90 Call one instance of FB DRIVE for each drive.
Allocate one instance data block to each instance.
Each instance checks cyclically whether a command for the corresponding
drive is available in the data block DB OPC or DB S7PAR and executes this
command, if necessary.
DB OPC DB 80 The data block DB OPC is used for data exchange between the bus server
and the drives.
A list of the commands for the individual drive controllers is saved in
DB
OPC.
DB S7PAR DB 81 The data block DB S7PAR is used to write parameter data from the PLC. The
function FC Parameter is used to write the parameter data jobs to DB
S7PAR .
In this description, symbolic names are used for the blocks. If you want to use these names instead
of the individual block numbers in the STEP7 project, you first have to create them in the symbol table.
In the following sub-chapter, this program structure will be explained in detail.
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