TGN Energy

FlexControl
Installation Manual

Connection, network configuration and IP addressing
v1.0 — June 2026
Protocol: Modbus TCP/IP
Cabling: Cat6
Subnet: 10.10.[SiteID].x
(SiteID from TGN Energy)
1

System Components

Included in FlexControl
TGN HMIOperator panel mounted in door
NXT Step CyberBoxControl unit; internet via X1P1
Modbus TCP/IP switchInternal network switch
PLIO module (DI/DO/AI/AO)Large (PLIO03) or small (PLIO06)
24V DC + 230V supplyInternal voltage
Connected externally
Grid Analyser – InputCarlo Gavazzi EM24 | 5A current transformer
Grid Analyser – BESSAcuvim II | aggregated battery current
Grid Analyser – PVCarlo Gavazzi EM24 | single or aggregated
BESS / PV InvertersBattery systems and solar arrays
2

Connection Diagram

⚑
Example diagram

Number of battery systems, inverters and meters varies per installation. IP addresses always follow the series structure in section 3.

INTERNET → X1P1 on NXT Step CyberBox Ethernet TGN FlexControl TGN HMI Operator Panel Door mounted NXT Step CyberBox Control unit Internet: port X1P1 Modbus TCP/IP Switch All field devices connect here Meters / BESS / PV / EV-chargers ↑ Cat6 from all devices Supply 230 V AC 24 V DC internal PLCM04 (optional) RS485 extension Modbus RTU add-on Cat6 Cat6 Cat6 GRID ANALYSER – INPUT Carlo Gavazzi EM24 | 5A CT 10.10.[SiteID].31 Modbus TCP/IP GRID ANALYSER – BESS Acuvim II | 5A CT 10.10.[SiteID].32 Modbus TCP/IP GRID ANALYSER – PV Carlo Gavazzi EM24 | 5A CT 10.10.[SiteID].33 Modbus TCP/IP ⊕ GRID INPUT / CONSUMPTION Main grid connection Peak shaving measurement ⬡ BATTERY SYSTEM (BESS) One or more battery cabinets 10.10.[SiteID].41 – .4x Aggregated current measurement ☀ PV SYSTEM One or more inverters 10.10.[SiteID].51 – .5x Optional PV control All field devices (meters, BESS, PV inverters, EV chargers) are connected via Cat6 to the internal Modbus TCP/IP switch
Modbus TCP/IP – Cat6 cable
AC/DC connection
IP series address (Modbus TCP)
Ethernet / Internet

Example diagram — number of batteries, inverters and meters varies per installation

3

IP Addresses – Modbus TCP/IP

⚠
Critical – Modbus TCP/IP only

All devices cabled via Cat6 to the internal switch in FlexControl. IP addresses set per the table below. Protocol must be Modbus TCP/IP – not Modbus RTU.

ℹ
SiteID – part of the IP address is site-specific.

Replace [SiteID] with the correct value for the site. Assigned by TGN Energy – contact support@tgnenergy.com at commissioning.

Component IP Address Series Instrument Status
Meter – Grid Input
Consumption / peak shaving
 10.10.[SiteID].31 3x Carlo Gavazzi EM24 Mandatory
Meter – BESS
Aggregated battery current
 10.10.[SiteID].32 3x Acuvim II Mandatory
Meter – PV
Solar production
 10.10.[SiteID].33 3x Carlo Gavazzi EM24 Mandatory
Battery 1
BESS unit
 10.10.[SiteID].41 4x BESS system Per unit
Battery 2, 3 …
One address per battery
 10.10.[SiteID].42 … 4x BESS system Per unit
PV Control 1
Inverter control
 10.10.[SiteID].51 5x PV inverter Optional
PV Control 2, 3 …
One address per inverter
 10.10.[SiteID].52 … 5x PV inverter Optional
Subnet 10.10.[SiteID].x
.31 – .3x
Meters
.41 – .4x
Batteries
.51 – .5x
PV Control
4

Installation Steps

  1. 1
    Mount the FlexControl cabinet

    Place the cabinet in the switchroom. Connect 230V supply and verify 24V DC internal voltage.

  2. 2
    Connect to the internet

    Connect the internet cable to port X1P1 on the NXT Step CyberBox. Required for remote monitoring and updates.

  3. 3
    Install grid analysers

    Mount Carlo Gavazzi EM24 (grid input and PV) and Acuvim II (BESS). Connect 5A current transformers where required.

  4. 4
    Cable all devices with Cat6

    Run Cat6 cable from each grid analyser, BESS unit and PV inverter to the Modbus TCP/IP switch in the FC cabinet.

  5. 5
    Set IP addresses per table (section 3)

    Configure IP addresses on all devices. Always use Modbus TCP/IP. Verify that all devices respond on their assigned address.

  6. 6
    Commissioning – performed by licensed electrician

    All components are configured and started by an authorised electrician. Log all Modbus addresses and verify communication against the FC system.

5

Optional Modules and Extensions

Module / componentFunctionConnection
PLCM04 RS485 extension (Modbus RTU) for HMI Plug-in module, internal
TGN Modbus switch (external) Extension for large installations Cat6 to internal switch in FC cabinet
PV Control (active) Active inverter regulation Modbus TCP/IP, 5x series IP
BESS AUX supply Auxiliary power for battery management 230V from BESS cabinet
TGN Energy AS — FlexControl Installation Manual v1.0
June 2026  |  support@tgnenergy.com