Omron CQM1H-CLK21 - Manual (Page 258)

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What is Network Interconnection? Section 7-1
• Although a C200HX/HG/HE PLC 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 PLC supports only one Communications Unit. It cannot
function as a data bridge or a data and communications protocol gateway.
• Communications across up to eight networks, including the local network
are possible when using a CS/CJ-series CPU Unit with unit version 2.0 or
later. The following conditions and restrictions apply.
• The CPU Unit for all nodes must be a CS/CJ-series CPU Unit with unit
version 2.0 or later.
• Routing tables can be set using the CX-Net in the CX-Programmer
version 4.0 or higher.
• Communications across up to eight networks away are supported by
Controller Link and Ethernet networks only.
• DeviceNet and SYSMAC LINK networks support communications
across up to three networks, the same as previous versions.
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
PLC
Controller Link Controller Link
PLC
Controller Link SYSMAC NET
C200HX/HG/HE CVM1 or CV-series PLC
Network 1 (local network) Network 2 Network 3