LU9GC3

Configured for Modbus trunk distribution in TeSys U communication networks, the Schneider Electric LU9GC3 (LU9G Modbus hub) provides physical connection between the Modbus trunk cable and multiple RJ45 communication branches. It has 8 RJ45 tap-off ports, 2 RJ45 daisy-chain ports, and a 4-point screw terminal block for the trunk connection.

Hardware Specifications

Parameter	Specification
Model	LU9GC3
Brand	Schneider Electric
Product Type	Modbus hub
Range	TeSys
Device Short Name	LU9G
RJ45 Connectors	10 total
RJ45 Tap-off Connections	8
RJ45 Daisy-chain Connections	2
Trunk Connection	4-point screw terminal block
Maximum Number of Connections	8
Mounting	35 mm DIN rail clip or 2-screw panel mounting
Net Weight	0.26 kg
Package Dimensions	5.000 cm x 9.000 cm x 20.500 cm
Package Weight	328 g

Modbus Network Connection Architecture

The LU9GC3 separates the physical Modbus connection into dedicated tap-off and daisy-chain interfaces. Eight RJ45 connectors provide tap-off connections, while two RJ45 connectors support daisy-chain routing. The underside 4-point screw terminal block provides the interface for the Modbus trunk cable.

The unit is a communication distribution component rather than an active Modbus protocol processor. Installation should maintain the intended trunk and branch topology and avoid unnecessary parallel cable routing that can affect serial communication integrity.

Frequently Asked Questions

Q: How is the Modbus trunk cable connected to the LU9GC3?
A: The Modbus trunk cable is connected through the 4-point screw terminal block located on the underside of the splitter box.

Q: How many RJ45 ports are provided?
A: The LU9GC3 has 10 RJ45 connectors: 8 for tap-off connections and 2 for daisy-chain connections.

Q: How is the LU9GC3 mounted?
A: It can be clipped onto a 35 mm DIN rail or fixed to a panel using 2 screws.

Field Installation Guidelines

Mount the LU9GC3 on a mechanically secure 35 mm DIN rail or panel surface. Route the Modbus trunk cable separately from high-current power and switching conductors where practical. Maintain correct conductor identification and termination at the 4-point screw terminal block.

For shielded Modbus cable, apply the system-specified shield bonding method and avoid creating unintended ground loops. RJ45 communication cables should be routed with adequate separation from motor, contactor, and soft starter power wiring. Verify the intended tap-off and daisy-chain arrangement before energizing the communication network.

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