Festo Контроллеры двигателя SFC-LAC - Manual (Page 40)

1. System summary
1−18
Festo GDCP−SFC−LACI−DN−EN en 0812NH
1.2 Communication
1.2.1 Data exchange via DeviceNet
DeviceNet was developed by Rockwell Automation and the
ODVA (Open DeviceNet Vendor Association) as an open
fieldĂbus standard based on the CAN protocol.
DeviceNet belongs to the CIP−based networks.
CIP (Common Industrial Protocol) forms the user interface of
DeviceNet and defines the exchange of:
ć I/O messages, e.g.Ătime−critical processing data and
ć explicit messages with low priority, e.g.Ăfor configuration
or diagnosis.
The Open DeviceNet Vendor Association (ODVA) is the user
organisation for DeviceNet. Publications on the DeviceNet/
CIP specification can be found under:
ć ODVA (Open DeviceNet Vendor Association)
http://www.odva.org
ć CI (ControlNet International)
http://www.controlnet.org.
Explicit Messages
(Explicit Messaging) Explicit messages consist of a request and an answer.
This way services can be directly requested from or exĆ
ecuted by a station.
Explicit messages contain (target address, class, instance,
attribute and value of the attribute as well as a service
identifier (service code) for data use.