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Ethernet communication
Star topology
In star topology, only one RJ45 cable must be connected between the MTQ22-FBP.0 and a switch. An unmanaged standard
switch can be used in this operation mode.
Bus topology
In bus topology, the internal two-port-switch of the MTQ22-FBP.0 is used to connect MTQ22-FBP.0 to MTQ22-FBP.0. Only the
first MTQ22-FBP.0 in the chain needs to be connected to a switch. The second Ethernet port of the last MTQ22-FBP.0 can be
left unconnected. An unmanaged standard switch can be used in this operation mode.
Ring topology with network redundancy
The ring topology offers cable redundancy on the Ethernet side. The topology is similar to the bus topology, but the last
MTQ22-FBP.0 in the chain must be connected to the switch again to close the ring. A managed switch supporting MRP and
acting as MRP manager must be used in this case. The redundancy protocol implemented in the MTQ22-FBP.0 is according to
EN/IEC 62439-2.
The MRP standard defines two principal device roles in a MRP network. The MRP manager which is typically a
managed network switch, and MRP clients which are typically automation devices like the MTQ22-FBP.0.
The MRP master sends out test telegrams cyclically to check the health status of the network. If everything is in order, it
blocks telegrams on one side of its internal switch to avoid loops (left side of the next figure). If a fault is detected
somewhere in the network, the MRP master reorganizes the network and closes its internal switch. In this way, all network
nodes are still accessible (right side of next figure).
Network Switch /
MRP Manager
MTQ22
UMC
UMC
UMC
UMC
UMC
UMC
UMC
UMC
UMC
UMC
UMC
UMC
UMC
UMC
UMC
UMC
MTQ22
Twisted Pair Ethenet
PLC / DCS
Network Switch /
MRP Manger
MTQ22
MTQ22
PLC / DCS
FBP Interface
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06 This figure shows how a single network failure is corrected in a MRP network. The left side shows the intact network.
The MRP manager has opened its internal switch, so all nodes can be reached using the green dotted route.
On the right side the MRP master has detected a network problem and has closed its internal switch to ensure
connectivity to all network nodes. The blue dotted path shows how all network nodes are currently reached.
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U N I V ER S A L M OTO R CO N T R O L L ER U M C 10 0. 3 |
MTQ2 2- FB P.0 MODBUS TCP M A N UA L