DVC6200f Digital Valve Controller
November 2010
270
B2713-1 / IL
LAS
DT(A)
Device X
Device Y
Device Z
CD (X, A)
LAS=Link Active Scheduler
P=Publisher
S=Subscriber
CD=Compel Data
DT=Data Transfer Packet
Schedule
X
Y
Z
B
P
P
P
S
S
S
C
D
A
A
A
Host System
Figure D-4. Scheduled Data Transfer
B2714-1 / IL
LAS
Device X
Device Y
Device Z
PT (Z)
LAS=Link Active Scheduler
P=Publisher
S=Subscriber
PT=Pass Token
M=Message
Schedule
X
Y
Z
B
P
P
P
S
S
S
C
D
A
A
A
M
M
Host System
Figure D-5. Unscheduled Data Transfer
Report Distribution: This type of
communication is used to broadcast and multicast
event and trend reports.
Client/Server: This type of communication is
used for request/ response exchanges between pairs
of devices, such as a set point change. Like Report
Distribution reporting, the transfers are queued,
unscheduled, and prioritized. Queued means the
messages are sent and received in the order
submitted for transmission, according to their priority,
without overwriting previous messages.
D
Содержание FIELDVUE DVC6200f
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Страница 251: ...Principle of Operation November 2010 239 A A Appendix A Principle of Operation Digital Valve Controller Operation 240 A ...
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