Design Features

The NTX-260 Substation Controller is the top-of-the-line of our NTX Series substation system designs. It incorporates complete substation management functionality for extra-large data concentration and protocol translation, while supporting a very large amount of local I/O for full integration of old and new substation designs. Architecturally, the NTX-260 can be described in terms of a client/server relationship. A source produces data (a server) and a destination requires the data (a client). Throughout the NTX-260, servers (e.g., NTX gateway to IEDs) produce data, and clients (e.g., NTX gateway supplying the virtual databases to the master) receive data. It can also transmit numerous selected subsets of this data to one or more master stations in the master’s native protocol. 


To take maximum advantage of the client/server model, the NTX-260 uses a distributed CPU processing architecture. Multiple high-performance ARM9E (Advanced RISC Machine) 32–bit microprocessors, each programmed to support specific functions, are linked together using a peer–to–peer type network. The ARM9E microprocessor-controlled high capacity NTX serial and Ethernet gateways makes it an ideal, high performance substation solution as a data concentrator and protocol converter for large power plants, transmission and distribution substation installation.   


Design Features:


  • 19” rack mount card file(s); front/rear plug in expansion modules (meets IEEE 1101/11 & 1011.10 3-U standards). May be bottom mounted for panel installations.
  • Distributed processing architecture featuring multiple high-performance, ARM9E 32–bit microprocessors with DSP extension in a client/server, peer–to–peer type LAN
  • Embedded Linux operating system (not accessible by the user, for secure operating conditions)
  • Legacy protocols from previous Connex/NTU models will be supported, based on demand
  • Extended temperature range of –10° to 70°C (14° to 158°F)
  • Multiple Virtual RTUTM database mapping
  • Field programmable; remotely programmable via an Ethernet WAN/LAN
  • Optional IEC 611131–compliant NTX Logic PLC that executes user–defined control and/or calculation algorithms
  • Sequence–of–events reporting with 1ms resolution
  • Built-in IRIG-B (unmodulated) Time Code Reader and GPS time reference (NMEA 0183) interface (optional external antenna required) or NTP time synchronization supported via the Ethernet network
  • Two USB channels: one for mini–USB to USB connections to the maintenance channel; one to support a thumb drive to update firmware and archive configuration files
  • Multiple 10/100 BaseT Ethernet with DNP or Modbus RTU protocol over TCP/IP or UDP client, server or multiples of both, with a high quantity of IP connections available per port
  • EURO Card format (3U x 42HP); mid-plane motherboard where the front module contains the majority of the logic (network CPU node), and the rear module contains the corresponding terminations
  • Multiple master/IED isolated communication serial interfaces (configurable per port for RS-232C, with or without flow-control, to external modems or fiber optics, or RS-485 for copper)


Application and expansion:


The NTX-260 is typically used in a traditional centralized 19” equipment rack or cabinet. An NTX system controller with termination provides a combination of router and dual-serial ports, with a 10/100 BaseT Ethernet port gateway as the base communications. The router component acts as an NTX internal network controller, where the map of all physical to virtual data is stored. A binary output controller supports up to 256 external control relays with both momentary (varying contact voltage/current ratings support) and latch relays. The local input controller supports up to 256 16-point Analog Input modules, 512 32-point Digital Input modules and 16 external DC Analog Output channels. 


I/O requirements beyond the base 8-slot I/O motherboard for analog and/or digital input modules are configured in an external expansion I/O card File, with 8 or 16 additional I/O motherboard slots. The unit power supply and up to seven additional NTX Quad-Serial with Ethernet port gateways can be incorporated in the card file mid-plane system motherboard—for a total of 30 isolated EIA561 RS-232/RS-485 RJ45 serial ports and 8 high-capacity 10/100 BaseT Ethernet ports. The local I/O node controllers will use two of these slots when configured. 


NTX Explorer software makes it easy to configure or expand the type and number of ports and protocols communicating with the master stations or IEDs, defining local I/O points, and/or other components. 


Key Specifications (see product brochure for complete list)
Base card file
Complies with IEEE 1101/11 & IEEE 1011.10 standards; 84 HP wide and 3U high (19” W x 5.25” H x 12” D) for single Euro-card format modules, 19” rack or bottom wall- or panel-mounting
Configuration: the full-size card file contains the power supply, an 8-slot node system mid-plane motherboard, and an 8-slot I/O mid-plane motherboard
Expansion card file
Expansion chassis for additional analog or digital inputs beyond the base card file module capacity is equipped with 8 or 16 analog and binary input module slots
Time clock
On–board UTC time/date clock, non–volatile; internal time code reader for satellite clock unmodulated IRIG–B (with P1344 extensions) time synchronization or with optional antenna, GPS clock time synchronization (NMEA 0183 protocol), or NTP via the Ethernet network
Database capacity
14,000 data values per system controller and NTX gateway
Serial port connections
EIA561 RJ45 connectors
Ethernet connection
RJ45, with multiple client, server and multiples of both; IP configurable
Serial communication ports
Isolated digital EIA561 RS–232C DTE (with or without handshaking) or RS–485 serial interfaces, configurable per RJ45 port
Optional external fiber optic transceiver
Serial analog operation channel
Two– or four–wire (9600 baud with optional external modem; 1200 baud with optional internal Bell 202 modem)
Serial baud rate
300 to 115,200 bits per second, selectable per port
Local programmable logic
NTX Logic (optional) is a Programmable Logic Controller (PLC) application that runs on the NTX System Controller platform with termination module. It supports all of the standard IEC 61131 and 61499 control program languages, as well as Flow Chart.
Binary input capacity
512 points, in groups of 32 inputs (per installed I/O controller)
Configurable per point as binary with time (SOE2), binary without time (Status), or Form A or two consecutive as Form C counters
Counter input capacity
256 Form C or 512 Form A points, in groups of 1 input (Binary inputs configurable for either Form A or Form C counters)
DC analog input capacity
256 points, in groups of 16 inputs (per local I/O controller)
Standard: 0 ± 1 mA (optional: 4–20 mA, 0 ± 1.5 mA, 0 ± 2 mA, 0 ± 10 mA, 0 ± 5 VDC, etc.)
DC analog output capacity
16 analog outputs, in groups of 1 channel (per local I/O controller)
Control output capacity
Optically isolated drivers for up to 256 relays (in groups of 6, 8 or 16 relays); per binary output controller
Power supply input
24 VDC, 48 VDC, 125 VDC/VAC, 120 VAC
Power consumption
30 watts, typical
Optional battery charger
Sealed lead–acid; 6 to 12 hours backup, typical


Misc. Options

Custom enclosures, with or without optional heater

Other external terminal block options

Bell 202 or 9600 baud 4–wire multi–drop telephone modem

 External GPS satellite clock and antenna

More Information

For more information call 800.831.7223 or contact This email address is being protected from spambots. You need JavaScript enabled to view it.



NTX-260 substation controller Brochure PDF


ACS NTX-260 substation controller Product Brochure

NTX-260 block diagram Brochure PDF


ACS NTX-260 block diagram Brochure