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ET 200U(DP Standard/FMS): Modes, Settings and Comm. Capabilities of IM 318–C
KR
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.
Type
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
Abbreviation
MSAZ
MSAZ_SI
MSZY
MSZY_SI
ATTR
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.
Local LSAP
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.
RSAP
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.
RADR
The Remote Address (RADR) is the station number of the FMS master.
SCC
Send Confirmed Request Counter
RCC
Receive Confirmed Request Counter
SAC
Send Acknowledged Request Counter
RAC
Receive Acknowledged Request Counter
ET 200U Distributed I/O Station
EWA 4NEB 812 6087–02b
Types of Link of the ET 200U(DP Standard/FMS)
Meaning
Master–slave link for acyclic data communications with-
out slave initiation
Master–slave link for acyclic data communications with
slave initiation
Master–slave link for cyclic data communications without
slave initiation
Master–slave link for cyclic data communications with
slave initiation
6-33
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