Omron CJ1W-FLN22, Operation Manual, Page: 52 / 277

Before Operation Section 3-1
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3-1 Before Operation
Precautions
Observe the following precautions when installing and using an FL-net Unit.
Installation Precautions Observe the following precautions when installing an FL-net Unit.
• Make sure that all of the nodes in the network are CS1W-FLN22, CJ1W-
FLN22, CS1W-FLN02, or CS1W-FLN12. CS1W-FLN01 FL-net Units can-
not be connected.
•
Use a transceiver cable that complies with the IEEE802.3 standards to
ensure high noise resistance.
•
Use a transceiver with a current consumption of not more than 0.4 A per
port.
•
Always turn OFF the power supply to the PLC before connecting or dis-
connecting the transceiver cable.
•
The current consumption of the FL-net Unit is 400 mA maximum. Make
sure that the total current consumption of all Units mounted to the PLC is
mounted does not exceed the capacity of the Power Supply Unit.
•
Do not lay the coaxial cables and transceiver cables of the network near
power lines. If installation near possible noise sources is unavoidable, be
sure to take adequate measures against noise interference, such as
installing cables in metal ducts.
Restrictions on Number of
Data Link Nodes The maximum number of data link nodes that can be used with the FL-net
Unit is 96 when links are stored in the CPU Unit, and 128 when links are
stored in the FL-net Unit.
Restrictions on Data Link
Capacity for Each Node In the Data Link Area for each FL-net Unit node up to 512 words can be allo-
cated in Area 1 and up to 8,192 words can be allocated in Area 2. The total
number of words that can be allocated in Areas 1 and 2 combined is 8,704
words.
Restrictions on Data Link
Data Concurrency Concurrency of data within each node is assured (concurrency of data
between all nodes is not assured).
If the data size of Area 1 and Area 2 for a single node exceeds 7,677 words,
however, the data for the corresponding node will be refreshed over two CPU
Unit cycles. Therefore, concurrency will be lost. The data will be split for
refreshing at 7,677 words counted from the beginning of Area 1. If a commu-
nications packet is corrupted for some reason, the data prior to the packet
being sent will be retained. When four consecutive token holding timeouts are
detected, the corresponding node in the Status Area will leave the network
and then rejoin it, but the PLC data will be held in its previous state.
The data for Area 1 and Area 2 from the same node will be refreshed in the
same CPU Unit cycle or Area 2 will be refreshed first. If concurrency is
required between the data in Area 1 and Area 2, use refreshing of the data in
Area 1 as a trigger before accessing data from Area 2.
Restrictions on Message
Transmissions When sending messages to other manufacturer's FL-net units, set the mes-
sage procedure confirmation setting to no confirmation.
FL-net network
version
Supported FL-net Units
V2.00 CS1W-FLN22
CJ1W-FLN22
CS1W-FLN02
CS1W-FLN12
V.100 CS1W-FLN01