Omron CVM1-CLK21, Operation Manual

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What is Network Interconnection? Section 7-1
• Although a C200HX/HG/HE PC supports multiple (maximum of 2) Com-
munications Units, it cannot function as a data bridge or a data and com-
munications protocol gateway.
• A CQM1H-series PC supports only one Communications Unit. It cannot
function as a data bridge or a data and communications protocol gateway.
• Communications across bridges or gateways can include up to three net-
works, including the local network (data generating network).
Although 2,012 bytes of data (including the header) can be sent and received
with a Controller Link, the maximum amount of data is limited by any network
the data passes through, i.e., the network with the smallest capacity will deter-
mine the limit.
If, for example, data passes through a SYSMAC LINK network as shown in
the figure on the preceding page, the amount of data sent and received from
the Controller Link is limited to 552 bytes (including the header) because the
SYSMAC LINK Network can only handle that many bytes.
See the manual for the network you are using in order to determine the maxi-
mum amount of data for each network.
Bridge
Gateway
Data Data
Data and communications
protocol gateway
PC
Controller Link
Controller Link
PC
Controller Link SYSMAC NET
C200HX/HG/HE CVM1 or CV-series PC
Network 1 (local network) Network 2 Network 3