Modbus SL Wiring Diagram Examples

Example 1: Modbus-SL Network with Stacked Modules Contained in Electrical Equipment

The following wiring diagram is an example. It shows the connections for the Modbus cable and the 24 Vdc power supply:

• The IFM interfaces and the Modbus SL hubs with part number LV434000 and TRV00210 are grouped in islands via stacking accessories.

• The Modbus client is installed in the same electrical equipment as the IFM interfaces and Modbus SL hubs.

Example 2: Modbus-SL Network with Stacked Modules Not Contained in Electrical Equipment

The following wiring diagrams are examples. They show the connections for the Modbus cable and the 24 Vdc power supply:

• The IFM interfaces with part number LV434000 or Modbus SL hubs are grouped in islands via stacking accessories.

• The Modbus client is installed in a separate section of electrical equipment from the IFM interfaces and Modbus SL hubs where the two sections of electrical equipment are not bolted together.

Example 1: 0 V of power supply is floating.

Section 1 of electrical equipment	Section 2 of electrical equipment

A	Modbus client installed in a separate section of electrical equipment from the Modbus SL hub or IFM interfaces where the two sections of equipment are not bolted together
B	Shielded Modbus cable coming from Modbus client
C	24 Vdc power supply
D	Shield coupling capacitor (for example, Kemet part number C981U103MZVDAA7317)
E	DIN rail
F	Shield resistor (used to bleed off shield capacitor)
G	Grounding terminal block connected to DIN rail (for example, Linergy part number NSYTRR24DPE or Phoenix Contact part number 3211809)
H	Modbus SL hub
I	IFM interface
J	Modbus line termination
K	Terminal block connected to DIN rail (for example, Linergy part number NSYTRV24D)

Example 2: 0 V of power supply is connected to local ground.

Section 1 of electrical equipment	Section 2 of electrical equipment

A	Modbus client installed in a separate section of electrical equipment from the Modbus SL hub or IFM interfaces where the two sections of equipment are not bolted together
B	Shielded Modbus cable coming from Modbus client
C	24 Vdc power supply
D	Shield coupling capacitor (for example, Kemet part number C981U103MZVDAA7317)
E	DIN rail
F	Shield resistor (used to bleed off shield capacitor)
G	Grounding terminal block connected to DIN rail (for example, Linergy part number NSYTRR24DPE or Phoenix Contact part number 3211809)
H	Modbus SL hub
I	IFM interface
J	Modbus line termination
K	Terminal block connected to DIN rail (for example, Linergy part number NSYTRV24D)
L	Grounding terminal block connected to DIN rail (for example, Linergy part number NSYTRV22PE)

Example 3: Modbus-SL Network with Modules in Daisy-Chain or Star Connection

The following wiring diagram is an example. It shows the connections for the Modbus cable and the 24 Vdc power supply:

• The IFM interfaces with part number LV434000 and Modbus SL hubs are connected in a daisy-chain or in a star connection.

• The Modbus client is installed in the same electrical equipment as the Modbus SL hub or IFM interfaces.

For information about cable shield management, refer to the rules for Modbus connection linking several pieces of electrical equipment.

Example 4: Modbus-SL Network with Modbus SL Hubs Connected Via a Terminal Block

The following wiring diagram is an example. It shows the connections for the Modbus cable and the 24 Vdc power supply:

• The Modbus cable has free wires.

• The Modbus SL hubs are connected in a daisy-chain or in a star connection.

• The Modbus client is installed in the same electrical equipment as the Modbus SL hub.

Wiring rules:

• 0 VL and 0V of energized LV434000 IFM interface must follow auxiliary power supply rules detailed in ULP system power supply.

• Only one 0V shield connection of SHLD and GND terminals of LV434211 adapter must be connected to the Modbus client.

For information about cable shield management, refer to the rules for Modbus connection linking several pieces of electrical equipment.