Hitachi S10VE User Manual page 394

(3) Notes on using FL-net
For details about the specifications of the FL-net transmission line, see the S10VE User's Manual
Option FL.NET (LQE702-E) (manual number SEE-1-104) or see IEEE 802.3. The following is a list
of notes on using the FL-net:
- Make sure that no communications data from other Ethernet connections is transmitted over an FL-net
communication cable.
- Do not connect an FL-net to a router.
- Using a switching hub for an FL-net is not effective.
- If you use media such as infrared or wireless communications, the real-time responsiveness of
communication might deteriorate considerably.
- When using a PC, the real-time responsiveness of communication might change considerably
depending on the performance level of the PC and the OS and applications being used.
- Use fixed IP addresses. The same network address must be used. (The standard network address is
192.168.250.) There is a recommended input range for the node number (station number) of the IP
address. Duplication of node numbers cannot be checked at initialization, and a node number
duplication error is reported only after communication starts. Use caution when setting the node
numbers.
- Securely connect the ground cable. In addition, use a ground cable with a thickness of at least 2 mm
- Maintain a sufficient distance between communication cables and noise sources. For example, do not
run a power cable alongside a communications cable.
- When cyclic data and message data are sent at the same time, the real-time responsiveness of
communications might deteriorate.
- You do not have to allocate consecutive areas (common memory areas) for cyclic data communication.
- Overall on-time data communicability of the system is affected by the processing performance of
connected devices. Communication speeds are only as fast as the slowest device (with the largest value
for the minimum allowable frame interval). As a result, connecting or adding a single device may
considerably reduce the real-time responsiveness of the overall system.
- The header block of message data communications uses big-endian, whereas the data block uses little-
endian. As an exception, the system parameter of the data block for profile reading uses big-endian
(meaning that MSB is sent first).
Network address
192.168.250.
13-49
Node number
1 to 249
13. Troubleshooting
2
.