NZ2WL - xxx vii
Note on Connections
CAUTION
- 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 a MELSEC-Q Series CPU module (with Built-in Ethernet) or a
MELSEC-L Series CPU module to an Ethernet port on a MELSOFT product by wireless LAN
connection.
- 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.
Note on Connection with 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: C04BH, 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.
For how to turn off the COM.ERR.LED, refer to "Q Corresponding 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 5B4Hto the TCP Maximum Segment Transmission setting area
(address: 1EH) and execute reinitialization.
For reinitialization, refer to "Q Corresponding Ethernet Interface Module User's Manual (Basic)."
*2 The TCP Maximum Segment Transmission setting area can be configured only for the Ethernet interface modules
(QJ71E71-100) with function version B or later, whose first five digits of the serial number are 05051 or later.
When the setting is changed to "Enable TCP Maximum Segment Size Option transmission, there are restrictions on
combination with the MELSOFT products. Refer to "Q Corresponding Ethernet Interface Module User's Manual
(Basic)".
