Wieland samos PRO COMPACT - Adjust Performance; Connection with more than One PLC

EtherNet/IP gateway
Wieland Electric GmbH | BA000970 | 11/2016 (Rev. F)
108
Adjust Performance
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A configuration of the number of process data bytes exactly matching the application helps to
reduce the volume of periodically exchanged data bytes.
The PLC specifies the number of output bytes in the form of specific Forward_Open Service
data as
Connection Size
for O→T. The PLC should set the
Fixed/Variable
bit to 1, meaning
va-
riable
.
The PLC also specifies the number of input bytes. The controller module cyclically transfers da-
ta in the scope of the
connection size
for T→O through RPI in the value specified in For-
ward_Service. If the
fixed/variable
bit is set by the PLC, meaning
variable
, then not all the as-
sembly bytes must be transmitted.
Connection with more than one PLC
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The EtherNet/IP function of the SP-COP2-ENI module allows access by more than one PLC. Up
to five encapsulation sessions with input and output data can be set up simultaneously.
If only reading of the process data of the SP-COP2-ENI module is required, “Input only” or
“Listen only” connections can also be used. Note that a “Listen only” connection is closed au-
tomatically by the SP-COP2-ENI module when the owner, who has set up the “Exclusive” or
“Input Only” connection, terminates the connection.
If process data from multiple PLCs are to be transmitted to the SP-COP2-ENI module, the other
PLCs can access the assembly instances 138 to 141 for Class 1 connections. Class 3 connec-
tions can be set up in parallel, provided that there is no conflict with regard to the owner. Plea-
se see the following for more information:
List of Assembly data [ch. 8.5.1, p. 101]
8.7
8.8