iRTU in accordo alla Specifica Terna


For all plants whose operation has an influence on the operation of the National Electricity System, Terna, in its "Grid Transmission, Dispatching, Development and Security Code", has established in Annex A.6 that the grid owner must make available all the information needed to perform the functions of supervision and control, remote regulation and remote monitoring of the plant.

To ensure the proper performance of Grid monitoring and control activities, Terna has established that for all:

  • NTG plants or plants functional to the NTG at a voltage greater than or equal to 50 kV;
  • Production, consumption and self-consumption and distribution plants connected directly to the National Transmission Grid or indirectly to the National Transmission Grid through a portion of the grid with a nominal voltage equal to or greater than 50 kV; 
  • HVDC and Interconnector AC plants directly connected to the National Transmission Grid; 
  • Production plants connected to distribution networks (including those belonging to Closed Distribution Systems)

measurements and reports must be made available to ensure the observability of each plant and the essential management functions of the electricity system.

The information must be made available at Terna's Access Points (APs) in a manner that is fully compatible with the Terna Control System as prescribed in Appendix A.13 of the Grid Code.

The data to be made available are both digital and analogue, and depend in number and type on the type of plant connected to the NTG, and include the states of the switching devices and the electrical measurements associated with the HV/MV system. The acquired data must be transmitted to the Terna Control System on a dedicated network using the IEC 60870-5-104 protocol.

Thytronic, thanks to its collaboration with the IGRID T&D subsidiary, supplies RTU (Remote Terminal Unit) systems compliant with the Terna specification (redundant CPUs) capable of acquiring the required signals both in wired mode (digital input, analogue input) and in serial mode (RS485/422 interfaces, Ethernet) using the most common industrial protocols:

  • IEC 60870-5-101
  • IEC 60870-5-104
  • IEC 60870-5-103
  • IEC 60870-5-102
  • Modbus TCP-IP
  • Modbus RTU
  • DNP3.0 (serial, UDP, TCP)
  • DLMS
  • Profibus DP
  • IEC 61850 MMS
  • IEC 61850 GOOSE
  • OPC UA 
The Thytronic RTU system can be perfectly integrated with the communication system (TLC) installed in the plant and managed by Terna, in particular the CPU in redundant configuration makes available respectively

  • 4 Ethernet RJ45 10/100 Base TX / F.O. FX100 (RSTP) ports for interfacing to the two Terna routers
  • 2 Rj45 Ethernet ports for measurement status acquisition on bus
  • 8 RS485/422 interfaces
  • Analogue and digital I/O modules for acquisition of wired stat


Our RTUs also integrate the following functionality:

  • IEC 61131-3 compliant internal PLC
  • Hourly synchronisation via PTP & NTP
  • Local data storage on SD
  • Alarm & event management
  • Remote configuration
The system can be supplied mounted in a RACK cabinet complete with accessories and configured as per Terna specification.