Number of nodes in a Modbus network
Network length
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
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.
LT
UMC100.3 and MRP31.0
mounted in drawer
Termination active
Termination active
Network
Length
Modbus Cable
Modbus Cable
9 UNIVERSAL MOTOR CONTROLLER UMC100.3 | MRP31.0 MODBUS TCP COMMUNICATION MODULE MANUAL
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