Adjust Performance; Connection With More Than One Plc - Leuze electronic MSI 400 Series Manual

Fig. 8.28: Configuration of symbolic names for assemblies in MSI.designer
NOTICE
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The functions of the UCMM Message Client (unconnected), which can also be configured in
MSI.designer, are not available in the module version D-01.01.
8.7

Adjust Performance

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 Con-
nection Size for O→T. The PLC should set the Fixed/Variable bit to 1, meaning variable.
The PLC also specifies the number of input bytes. The controller module cyclically transfers data in the
scope of the connection size for T→O through RPI in the value specified in Forward_Service. If the fixed/
variable bit is set by the PLC, meaning variable, then not all the assembly bytes must be transmitted.
8.8

Connection with more than one PLC

The EtherNet/IP function of the MSI 430 module allows access by more than one PLC. Up to five encapsu-
lation sessions with input and output data can be set up simultaneously.
If only reading of the process data of the MSI 430 module is required, "Input only" or "Listen only" connec-
tions can also be used. Note that a "Listen only" connection is closed automatically by the MSI 430 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 MSI 430 module, the other PLCs can ac-
cess the assembly instances 138 to 141 for Class 1 connections. Class 3 connections can be set up in par-
allel, provided that there is no conflict with regard to the owner. Please see the following for more informa-
tion: List of Assembly data [chapter 8.5.1]
Leuze electronic MSI 400
EtherNet/IP gateway
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