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U N I V E R S A L M OTO R C O N T R O L L E R U M C 1 0 0 . 3 | M R P 3 1 . 0 M O D B U S T C P C O M M U N I C AT I O N M O D U L E M A N U A L
Number of nodes in a Modbus network
Each bus segment can have a maximum of 32 active devices which includes the Modbus master and the slaves.
Network length
The end-to-end length of the Modbus network is limited. The maximum recommended length is 1000 m. The use of passive
bus stub lines should be avoided. To bridge long distances between the Modbus master and the slaves (e.g. between the
control room and the motor control center) it is recommended to use fiber optic converters.
Modbus TCP
UMC100.3 can be directly integrated in a Modbus TCP EtherNet network by using the MTQ22-FBP.0 interface.
Modbus line with MRP31.0 directly connected to UMC100.3 in a drawout system
The following figure shows a simplified diagram on how to connect the UMC100.3 to a Modbus network. Required grounding
of the Modbus cable is not shown in this figure.
Ground wire and cable shield should be connected to prevent common mode voltage between the network
devices from drifting outside the allowable limits.
Modbus-Master
Network
Length
Termination active
L
T
Modbus Cable
Termination active
UMC100.3 and MRP31.0
mounted in drawer
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