Chapter 13: Troubleshooting

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.

2Do not connect the FL-net to a router.

3Switching hubs cannot be used on the FL-net.

4Using IR communications or other wireless media may reduce the communication speed.

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When a personal computer is used, the communication speed may be affected by the amount

of memory, the OS used, and other applications running on the personal computer.

Use the specified IP addresses.

6Network addresses should be used (the standard network address is 192.168.250.) The IP 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

Network address

 

Node number

 

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checked during the initialization check.

192.168.250

 

1 to 249

 

They will be checked when communication

 

 

 

 

 

 

 

 

 

 

starts.

 

 

 

 

 

 

 

 

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Connect the ground securely. Use ground lines that are large enough.

 

 

 

 

 

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Separate the communication lines from any noise generating sources. Do not lay

 

communication lines parallel to power lines.

 

 

 

 

 

 

 

 

 

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When executing both cyclic data communications and message data communications at the

same time, the communication speed may drop due to the volume of data.

11Areas (common memory areas) for cyclic data communications are not required to be 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

13speed 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

14little 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.)

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13-5