User's Manual

NZ2WL - xxx
vii
Note on Connections
- Do not use this product for applications that must transmit or update data regularly or within a given time
period, such as the cyclic transmission of a programmable controller. Transmission delays cannot be
obtained through calculations for Ethernet communications using this product.
- Use this product with the access point and station in visual range of each other (so that the antenna on one
device is visible from the antenna on the other device).
- During an Ethernet connection using wireless LAN, packets may be lost due to the peripheral
environment and equipment location, and the connection may not be as stable as with a wired Ethernet
connection. Be sure to check operations when using this product. Packets may be frequently lost
especially during broadcasts. In this case, use a user application or use UDP or TCP with a specified IP
address for the client.
- If the timer value set for the MELSEC Series equipment connected to this product is large, it may take
time to detect the loss of packets, and communications may appear to have stopped.*1 In this case,
changing the timer value may fix the problem.
- Do not directly connect MELSOFT products by Ethernet port (simple connection) through wireless LAN
to the MELSEC iQ-R Series CPU Module, MELSEC-Q Series CPU Module (Ethernet built-in type), or
the MELSEC-L Series CPU Module.
- For additional restrictions and notes on using a wireless LAN connection, see the manual of the MELSEC
products to which this product is connected.
- This product cannot be directly connected to a CC-Link IE Field Network. A wired Ethernet connection
must be made using an optional CC-Link IE Field Network Ethernet adapter module.
- If a problem occurs, but there is nothing wrong with the settings or usage of MELSEC products connected
to this product or the Ethernet wire, there may be a problem with the setup or settings of this product.
Refer to "Chapter 7 Troubleshooting" and check the operations of this product. You can also refer to the
user's manuals of the MELSEC products connected to this product.
*1 For example, the default value of the response monitoring timer of the Ethernet Interface Module is 30 seconds, so it
takes 30 seconds to detect packet losses.
When using the product with the MELSEC-Q/L Series Ethernet
Interface Module
- When connecting this product with an Ethernet interface module, the COM.ERR.LED of the Ethernet
interface module may turn on (error code: C04B
H
, etc.) due to some reasons such as packet loss.
Communication can be performed with the COM.ERR.LED turned on. However, check carefully that the
system works as expected.
Regarding how to turn off the COM.ERR.LED, see the “Q Corresponding Ethernet Interface Module
User's Manual (Basic)” or the “MELSEC-L Ethernet Interface Module User's Manual (Basic).”
- When the COM.ERR.LED frequently turns on, the following operations may reduce the frequency:
- Use TCP on the connection.
- Enable TCP segmentation*2.
To enable TCP segmentation, set 5B4
H
to the TCP Maximum Segment Transmission setting area
(address: 1E
H
) and execute reinitialization.
For reinitialization, see the “Q Corresponding Ethernet Interface Module User's Manual (Basic)” or the
“MELSEC-L Ethernet Interface Module User's Manual (Basic).”
*2 Configuration of the TCP Maximum Segment Transmission setting area is only available with either the MELSEC-Q Series Ethernet Interface
Module, or the MELSEC-L Series Ethernet Interface Module along with their upper five serial number starting from 05051. There are limitations
on combining the Ethernet Interface and the MELSOFT products. See the “Q Corresponding Ethernet Interface Module User's Manual (Basic)” or
the “MELSEC-L Ethernet Interface Module User's Manual (Basic)” for details.
CAUTION