Advantech ADAM-5000/ECAT handleiding
Handleiding
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4.1 Object Dictionary
In industrial automation, use of device profiles is a very common method to describe the functionality
and parameters of the devices. EtherCAT allows the use of multiple protocols for communications.
For acyclic data exchange, EtherCAT provides mailbox communication protocols (CoE, SoE, EoE,
FoE, AoE). Cyclic data is exchanged in Process Data Objects (PDOs) with fixed or configurable PDO
sizes.
ADAM-5000/ECAT Slave Terminal uses the CAN application protocol over EtherCAT (CoE) as the
device profile. This is the most commonly used EtherCAT communication protocol for acyclic data
access. It is also provides mechanisms to configure PDOs for cyclic data exchange.
ADAM-5000/ECAT also uses
File Access over EtherCAT (FoE) to update firmware.
In EtherCAT, several protocols are available for the application layer to implement the required
specification of the product development. Data is exchanged cyclically or acyclically and data sizes
can be fixed or configurable.
There are two methods for reading and writing data to objects: Process Data Object (PDO) and
Service Data Object (SDO). PDOs are used for cyclic, time critical data exchange, while SDOs are
used for non-time-critical communication and configuration. PDOs are the primary method for
communication during run-time but they must be configured prior to being used. PDO transmission
occurs only while the EtherCAT state machine is in the OP mode (and limited transactions during
safe operational state). SDO messages may be used any time after initialization.
4.1.1 S
tructure of Object Dictionary
Several device profiles can be applied for EtherCAT devices by using CoE. ADAM-5000/ECAT Slave
Terminal uses Modular Device Profile (MDP) which a standardized structure for the Object
Dictionary (OD) provided by CoE is defined. It is a helpful configuration mechanism for EtherCAT
slave structure like ADAM-5000/ECAT, usable for a large number of devices from very simple one to
complex sub-structured. The modular device profile can be applied for different device types.
Depending on the device type the object dictionary can be static (defined in ROM) or dynamic
(defined in RAM). The dynamic object dictionary can be configured by the EtherCAT master during
PRE-OP by writing the expected module configuration or can be generated automatically after
power-on.
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Productinformatie
| Merk | Advantech |
| Model | ADAM-5000/ECAT |
| Categorie | Niet gecategoriseerd |
| Taal | Nederlands |
| Grootte | 22504 MB |
