Festo Электромотор MTR-DCI - Manual (Page 22)

Contents and general safety instructions
XX
Festo P.BE-MTR-DCI-DN-EN en 1209a
Term Meaning
I/O Messaging (Implicit
messaging) I/O data transfer “I/O Messaging” is used for exchanging time-critical
data (e.g. process data). An I/O message contains only data. All informa-
tion defining how the data is to be handled is stored in the “Connection”
object the message is assigned to.
I/O Polling The slaves are cyclically queried by the master.
The master sends a polling command to a slave that also contains data
for the slave. If the slave has data for the master then it sends this to the
master. If a slave does not answer a polling request from the master then
this leads to a timeout error.
EDS file Contains the specific properties of the DeviceNet slave (e.g. number of
I/Os, parameters, etc.). The DeviceNet configuration tool reads the EDS
files of the devices in the network and uses these to calculate the con-
figuration data that is subsequently loaded into the DeviceNet partici-
pants.
Object An object is a collection of data (attributes). These attributes defined
different properties of a DeviceNet device and can be read and written
over the bus. For access, see: “Object directory”
Object directory The object directory contains all device parameters and current process
data that is directly accessible via FHPP, the Fieldbus, or directly via CI.
The object directory is subdivided into an area containing general device
information (device identification, manufacturer name, etc.) and com-
munication parameters, and an area describing the specific device func-
tionality. An entry (object) in the object directory is identified by
FHPP FPC: Parameter number PNU
CI:
Index and Subindex
DeviceNet: class, instance, attribute
Participant address
(node address) Each of the up to 64 participants in a DeviceNet network has its own
MAC ID (Media Access Control Identifier); which is a component of the
CAN identifier.
Table 0/4: Terminology