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Communication Services
4-11
SIMATIC 505 PROFIBUS-FMS CP User Manual
4.4 Send-Receive Services
Before
you configure a Send-Receive job, you must first define an FDL
connection using the COM5434 Configurator
. T
o define an FDL connection,
follow the steps described in Section 5.7.
The FMS CP module supports Send and Receive job types with FDL
connections. T
o configure a Send or Receive job, follow the steps described in
Section 5.10.
Figure 4-6 shows the data flow of each Send-Receive communication job.
Each job must be configured in both the module executing the Send job and
the module executing the Receive job.
Send
Local
Station X
FMS CP
FMS CP
CPU
CPU
Remote Station
Y
Receive
Job
Data is received from a
remote network partner
and is stored in a specified
local memory address. The
source address of the data
in the remote station is not
specified.
Data Flow
Data
from memory Data to memory
Send
Job
Data stored in a specified
memory address in the
local station is sent to a
remote network partner
.
The destination address of
the data in the remote
station is not specified.
Receive
Receive
Local
Station X
FMS CP
FMS CP
CPU
CPU
Remote Station
Y
Data
Flow
Data
to memory
Data from memory
Send
SEND
RECEIVE
Figure 4-6 Send-Receive
Communication Jobs
NOTE:
In general, it is best not to configure more than one Send or Receive
job for each FDL connection.
!
CAUTION
The
FMS CP module fails if you try to execute two Receive jobs at the same
time on a single FDL connection. Module failure could cause unexpected
results in your control application, which could result in personal injury
, and/or
damage to property
.
T
o avoid this problem, do not program more than one Send or Receive job to
execute simultaneously on a single connection.
FDL
Connections
Send-Receive Jobs
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