Beckhoff EP9300-0022, Руководство пользователя

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PROFINET
EP9300-0022 49 Version: 2.3
6.2 Representation of an EtherCAT slave on PROFINET
This section is intended to help explain the description of EtherCAT devices on another fieldbus system and
to obtain the corresponding information from the existing EtherCAT documentation. In the following terms
are explained for a better understanding.
• Introduction
EtherCAT devices such as EL terminals (ES, ELX, ELM), EP modules (ER, EQ, EPP) are EtherCAT slave
devices that always consist of process data and, if necessary, parameter data. As a rule, digital EtherCAT
devices have no configuration data. Complex EtherCAT devices usually always.
• Process data (PDO, process data object)
Almost all EtherCAT devices have process data
1)
that can be from 2 bits and up to several 100 bytes in size.
With complex EtherCAT devices, different structures and process data sizes can also be specified. These
are so-called Predefined PDOs.
The Predefined PDOs must be specified by the EtherCAT (EC) Master and must be known or set here when
the EC Master is started. There is always a Default Predefined PDO. Depending on the higher-level bus
system used, the PDO mapping can be set on the EC coupler via the higher-level fieldbus system (as with
PROFINET or PROFIBUS) or a configuration page (http protocol, as with ModbusTCP or EtherNet/IP).
1)
Except for e.g. the EK1100 coupler, which has neither process data nor configuration data, it is equipped with an EtherCAT ASIC and
is therefore also visible in the EtherCAT network without process data.
Parameter data (COE)
The parameter data of an EC slave are transmitted via COE (CAN over EtherCAT). As with CAN, these are
divided into objects, subobjects and data. Parameter data, for example, is data that sets the resistance value
for an EL3202 terminal, i.e. a temperature resistance terminal, such as PT100, PT1000, NI100, etc.
Only the application-specific COE data is made available for the EK coupler. Depending on the
superimposed bus system, all or only some COE objects can be accessed here.
Here, too, parameterization can take place via a website (http protocol) in the EC.
PROFINET
• Process data
PROFINET devices (Slaves) must bring a GSDML file with them. The devices are described in this GSDML.
The EP9300-0022 is a device with a modular structure. It consists of a head station (EP9300-0022) and a
number of EtherCAT devices that are connected to the EP9300-0022. This file (GSDML) must then be
integrated into the PROFINET controller. If this has been done, the EP9300-0022 and the EtherCAT devices
can now be integrated and the appropriate settings made.
Predefined PDOs usually consist of different PDOs and are a compilation of different PDOs of the process
image.
This is illustrated below with the TwinCAT automation software: