6-33
ET 200U Distributed I/O Station
EWA 4NEB 812 6087–02b
The communication references (KR) designate the associations described in
the list of communication links.
The communication references are numbered from 2 to 8 in the list of com-
munication links. Communication reference 0 contains general definitions.
The “type” describes the communication link between the ET 200U(DP Stan-
dard/FMS) and the FMS master. There are six different types of link:
Table 6-38
Types of Link of the ET 200U(DP Standard/FMS)
Abbreviation
Meaning
MSAZ
Master–slave link for acyclic data communications with-
out slave initiation
MSAZ_SI
Master–slave link for acyclic data communications with
slave initiation
MSZY
Master–slave link for cyclic data communications without
slave initiation
MSZY_SI
Master–slave link for cyclic data communications with
slave initiation
The link attribute (ATTR) states whether a link is open (O) or defined (D).
In open links, layer–2 addresses are not entered until the link is being estab-
lished.
The Local Link–Service–Access–Point (Local LSAP) is the service access
point of the ET 200U(DP Standard/FMS) at which the message crosses the
interface between layer 2 and layer 7.
The Remote–Service–Access–Point (RSAP) is the service access point of the
FMS master at which the message crosses the interface between layer 2 and
layer 7.
The Remote Address (RADR) is the station number of the FMS master.
Send Confirmed Request Counter
Receive Confirmed Request Counter
Send Acknowledged Request Counter
Receive Acknowledged Request Counter
KR
Type
ATTR
Local LSAP
RSAP
RADR
SCC
RCC
SAC
RAC
ET 200U(DP Standard/FMS): Modes, Settings and Comm. Capabilities of IM 318–C