ABB UMC100.3 Manuale - Pagina 9

Sfoglia online o scarica il pdf Manuale per Controllore ABB UMC100.3. ABB UMC100.3 18. Modbus rtu communication module, universal motor controller

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

Modbus Cable

Termination active

UMC100.3 and MRP31.0

mounted in drawer