Omron CS1W-SLK11-21 - 06-2004 Manual page 102

What is Network Interconnection?
(2) A gateway is used between Communications Units to connect different
types of networks.
Bridge
SYSMAC LINK
PLC
Data
• Although a C200HX/HG/HE PLC supports up to 2 Communications Units,
it cannot function as a data bridge or a data and communications protocol
gateway.
C200HX/HG/HE
• 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 bridges or gateways can include up to three net-
works, including the local network (data generating network).
Network 1 (local network)
The maximum amount of data that can be sent between networks depends on
the type of networks through which data is being sent. The SYSMAC LINK
Network is limited a maximum of 552 bytes of data in any one transmission,
including the header. If a transmission passes through a SYSMAC LINK Net-
work, as shown in the figure on the preceding page, the amount of data is lim-
ited to 552 bytes.
Although 2,012 bytes of data (including the header) can be sent and received
with a Controller Link Network, if a transmission between two Controller Link
Network passes through a SYSMAC LINK Network, the amount of data would
need to be limited to 552 bytes per transmission.
Refer to the manual for the network you are using to determine the maximum
amount of data that can be handled.
SYSMAC LINK SYSMAC LINK
CS or CV-series PLC
Network 2
Section 5-1
Gateway
Ethernet
PLC
Data
Data and communications
protocol gateway
Network 3
85