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SICAM A8000 / CP-8000 • CP-8021 • CP-8022 Manual
DC8-037-2.02, Edition 10.2017
3.2.1.2 Automatic or Selective Data Flow Routing
For the data flow routing, a routing of individual process information items is not necessary.
Simply only the direction (monitor direction, control direction, both directions) in which the
messages are to be transmitted must be parameterized.
The type identification of each message provides information about the class (refer to
sages with Process Information
) to which a message belongs and with which methods it is to
be distributed:
•
Messages with process information
in monitor direction
─
For simple applications, the messages can be distributed via an entry in the topology
─
For more complex applications, the messages can be distributed selectively by means
of data flow filters
For each communication interface, pass-through filters or blocking filters can be set;
since wildcards can also be used for all address attributes of the message, it is possi-
ble to control the data flow very specifically with simple means
•
Messages with process information
in control direction
─
The messages are distributed to the destinations determined by their CASDU over in-
terfaces that are defined in the topology; the CASDU is interpreted as destination ad-
dress
3.2.1.3 Data Storage
The messages that are intended for transmission over communication interfaces, are in prin-
ciple stored chronologically in rings. There is a process image both before and after a ring.
The arrangement, consisting of one ring and two process images, is called a priority channel
(priority channels for transparent data do not have any process images).
Depending on the data communication mode of the protocol element over which the commu-
nication is processed, priority channels are provided for every priority of the messages to be
transmitted and for every station that can be reached via the protocol element:
•
Data communication mode "multi-point" (e.g. multi-point traffic, LAN )
One priority channel for every transmission priority, for every station and for every protocol
element
•
Data communication mode "single-point"
One priority channel for every transmission priority and for every protocol element
With regard to the data that they transport, priority channels are distinguished as follows:
•
Time synchronization
•
System information
•
Process information in control direction
•
Process information in monitor direction priority HIGH with class 1 data
•
Process information in monitor direction priority MEDIUM with class 2 data
•
Process information in monitor direction priority LOW with class 2 data
•
Transparent information
Summary of Contents for CP-8000
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