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13-3 General precautions related to the FL-net
For details about the FL-net transfer route standards, see the previous section and IEEE802.3. In addi-
tion, the following limitations and precautions should be noted.
Description
Do not place communication data from other Ethernet devices on the FL-net communication
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cables.
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Do not connect the FL-net to a router.
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Switching hubs cannot be used on the FL-net.
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Using IR communications or other wireless media may reduce the communication speed.
When a personal computer is used, the communication speed may be affected by the amount
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of memory, the OS used, and other applications running on the personal computer.
Use the specified IP addresses.
Network addresses should be used (the standard network address is 192.168.250.) The IP
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address node numbers (station numbers) should be within the allowable input range.
Be careful not to use the same node number
twice because the node numbers are not
checked during the initialization check.
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They will be checked when communication
starts.
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Connect the ground securely. Use ground lines that are large enough.
Separate the communication lines from any noise generating sources. Do not lay
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communication lines parallel to power lines.
When executing both cyclic data communications and message data communications at the
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same time, the communication speed may drop due to the volume of data.
Areas (common memory areas) for cyclic data communications are not required to be
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adjacent to each other.
When an SQE switch is installed on a transceiver, make sure it is properly installed according
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to the instruction manual.
Depending on the processing capacity of the connected devices, the minimum time for
communication throughout the system may be affected. Set the communication processing
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speed for the device with the slowest communication capacity (calculated from the minimum
allowable time between frames). Note that adding a single device may drop the
communication speed of the whole system significantly.
The header section of message data communications is big endian, and the data section is
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little endian. However, the system parameters, that is data section at reading profile, is big
endian. (Big endian is a method in which the MSB is sent first.)
Network address
192.168.250
13-5
Chapter 13: Troubleshooting
Node number
1 to 249
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