Lenze Drive Server Bus server S7 getting started Uživatelský manuál stáhnout pdf (Strana 23)

Busserv er S7

84 Busserver S7 DE/EN 1.0

5 Creating a STEP7 project

5.1 Overview of the STEP7 blocks

The foll owing figure gives you an o verview of the di fferent STEP7 blocks:

FB DRIVE

DB OPC

PROFIBUS-DP

PAPE

DB S7PAR

PAPE

Parameter data channel

Process data channel

Drive 1

OPC via

S7 protocol

parameter

process

data

Symbolic

block name

Block number Function

FB DRIVE FB 90 CalloneinstanceofFB DRIVE for each drive.

Allocate one instanc e da ta 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 necessar y.

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 da ta 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, thi s program structure will be explained in detail.

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Lenze Drive Server Bus server S7 getting started Uživatelský manuál Strana 23