Festo Контроллеры двигателя SFC-LAC - Manual (Page 21)

Contents and general instructions
XIX
Festo GDCP−SFC−LACI−DN−EN en 0812NH
Field bus specific terms and abbreviations
Term / abbreviation Meaning
0x1234 or 1234h Hexadecimal numbers are marked by a prefixed 0x" or by a suffixed h"
ATTR ATTRibute number
BCD Binary coded decimal
Bit strobe All slaves are scanned by the master with a command. Serves for
transmitting small amounts of data between a master and one or several
slaves, e.g.Ăfor synchronizing input or output data (is not supported by
the SFC−LACI−DN).
CI Command Interface
CLS CLasS, object classification
COS/Cyclic The messages are sent either by the master or by the slave cyclically (at a
fixed time interval), or when there is a change of state. In COS messaging,
a message is generated cyclically" if no status change occurs within a
certain time; for this reason COS and Cyclic are often treated as a single
message type.
EDS Electronic Data Sheet; contains the specific properties of the slave
(e.g.Ănumber of I/Os, parameters, etc.).
Explicit Messaging Direct connection. Explicit Messaging constitutes an (acyclic)
point−to−point communications connection with low priority between two
devices, and is typically used for configuration and diagnostic purposes.
Explicit messages contain the address and value of an attribute and a
Service Code that describes how these data are to be treated.
I/O messaging (implicit
messaging) I/O data transfer I/O Messaging" is used for the exchange of
time−critical data (e.g. process data). An I/O message contains
exclusively data. All information about how the data are to be treated are
stored in the Connection" object that is assigned to this message.
I/O polling The slaves are interrogated by the master.
The master sends a polling command to a slave; data for the slave are
transmitted together with this. If the slave has on its part any data for the
master, then it sends them to the master. If a slave does not answer a
polling request from a master, then this results in a timeout.
INST INSTance number