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2
SYSTEM CONFIGURATION
2.2 Devices Necessary for Network Configuration
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This section explains the devices that configure a network.
Please note that the network must be installed by qualified networking specialists to
take sufficient safety measures.
The 10BASE-T or 100BASE-TX can be used to connect the QJ71MT91 to a network.
The QJ71MT91 will distinguish between 10BASE-T and 100BASE-TX, and between
the full duplex and half duplex communication mode according to the hub type.
However, for connection with the hub that does not have the auto negotiation function,
set the half duplex communication mode on the hub side.
*1: For the number of cascade connection stages, refer to the Section 3.1.
Use the devices that comply with the IEEE 802.3 100BASE-TX/10BASE-T Standard.
(1) Hub and other equipment
(a) Shielded twisted pair cable
1) For 100BASE-TX
Shielded twisted pair cable (STP cable), Category 5
2) For 10BASE-T
Unshielded twisted pair cable (UTP cable), Category 3 (4, 5)
A straight cable can be used.
(We do not guarantee proper operation if a crossing cable is used for the
100BASE-TX/10BASE-T connection between the QJ71MT91 and the
target device.)
(b) RJ45 jack
(c) Hub for 100Mbps/10Mbps network
The QJ71MT91 does not support IEEE 802.3x flow control.
Therefore, when the load of an Ethernet line is high in the connection with
the hub compliant with IEEE 802.3x during full-duplex mode in high-speed
communications (100Mbps) using 100BASE-TX connection, the data to be
sent to the QJ71MT91 may be lost and the auto communication function or
the dedicated instruction may also be timeout.
If the above error occurs, reduce the load of an Ethernet line on a single
hub by adding hubs, for example.
MELSEC-Q
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