Intelligent solutions for Smart City, IoT, utilities and streetlight professionals


  • The intelligent gateway for rough environments

    The AmsCPU-IO module is the forth generation module for streetlight management and control. The module is designed for GridLight™ to provide basic needed functionality for feeder pillar streetlight control. Equipped with a powerful ARM9 processor and a Linux kernel, the module monitors and controls all other modules in the Amplex Module System. Direct communication and power supply between the modules is handled by means of an A-Bus interface, which is based on the industrially proven RS-485 technology. The AmsCPU-IO module is an extended AmsCPU with three relays, MODBUS connections to smart meters, S0 interface to traditional pulse meters and connectivity to a leakage current transformer.

    The AmsCPU-IO module serves as a WAN communications and data concentrator module. Three versions of the module with different communication carriers to provide two-way communication with the central server using 2G/3G/4G,NB-IoT (NB2), LTE-M (M1), SMS, WiFi (option) or Ethernet. The module has the ability to automatically switch between different available communication carriers in order to provide stable and reliable communication.To obtain the best, most reliable, and cheapest communication now and in the future, new carrier types like e.g. WIFI and LoRaWAN can be implemented using the USB or the Ethernet port on the module. Data are either delivered to the server immediately or stored locally in the built-in flash memory of the AmsCPU-IO module until scheduled delivery. Software and configurations are updated remotely from the server and stored on the AmsCPU-IO module enabling it to autonomously execute tasks, e.g. turn the streetlight on/off or collect meter readings based on the configurations set up by the user.

    Data is either delivered to the server immediately or stored locally in the built-in flash memory until scheduled later delivery. Software and configurations are updated remotely from the server and stored on the AmsCPU-IO module enabling it to autonomously execute tasks.

    Voltage values on all three phases of the main supply are monitored by the AmsCPU-IO module. If the module is installed together with an AmsBattery module, the AmsCPU-IO will be supplied with backup power via the A-Bus in the event of power failure. This enables the AmsCPU-IO module to store data and send a main power failure alarm to the central server before it shuts down safely.

    • Battery shutdown
      Battery low
      Communication class availability
      Over/under voltage (every phase)
      Main power failure
      Phase fault (every phase)
      Extra phase, for example for cabinet door monitoring
      Photocell for streetlight control
    • The Amplex Communication Framework (AmpCom) enables two-way multi-carrier communication. AmpCom uses communication classes to determine the priority of the data. One or more carriers are assigned to each class. If one carrier is not available, another carrier is used instead. Supported carriers: GPRS, SMS, Ethernet
    • All modules and meters connected to the AmsCPU-IO module are automatically discovered by the system. In case a module/meter is disconnected from the AmsCPU-IO, this is reported to the server application and the module/meter is listed as missing. If the module/meter is reconnected to the AmsCPU-IO or another AmsCPU(-IO), it will be rediscovered by the system.
    • The AmsCPU-IO module has a calendar and a real-time clock with an absolute maximum deviation of ± 7 seconds per 24 hours in the full temperature range. This is without synchronization with external units. Under normal conditions, clock deviation is automatically adjusted according to the Network Time Protocol (NTP) which gives a maximum deviation of ± 1 second.
    • The collected data are stored in a non-volatile memory which holds the values until they are sent to the server. The AmsCPU-IO module has the capacity to store data for at least 150,000 historical measurements, depending on the data size of the values.
    • A software management system designed to maintain the software on AmsCPU-IO modules remotely. Enables installation, removal, and upgrade of software through a web user interface on one or more selected AmsCPU-IO modules. It also allows on-site upgrades with an authenticated USB memory stick.
    • Sub system software, e.g. GridLight™ logic etc. can be downloaded from the Data Centre application for installation and upgrade.
    • Internal backup battery for clock and tampering monitoring
    • From the server application, AmsCPU-IO configuration data can be changed, as required. The configuration data include:
      Communication classes
      Surveillance of communication classes
      MeterMind™ features (an advanced metering infrastructure (AMI) system)
      GridLight™ features ( a centralized streetlight control system)
      StartGrid™ features (a low-voltage power network monitoring and control system)
    • Green (1): Power – flashes during startup, constant when ready. Small blinks if meter is connected.
      Yellow (2): Carrier – Indicates GSM/Ethernet connectivity, missing SIM card and signal strength.
      Red (3): Server connectivity. Lights up when server connection is established.
    • CPU LED (red): indicates whether the AmsCPU-IO module is up and running.
      Communication status LED (green): indicates whether a GPRS or an Ethernet connection has been established with the server.
      AMS Status LED (green): indicates whether the A-Bus is up and running.

    • Max data transfer rate 115.2 kbps
    • For use with Amplex service tools
    • 12 V DC supply to client modules, 10 W (max) In case of power failure, the A-Bus also serves as backup power supply for the AmsCPU-IO module.
    • Phase voltage measure (± 2% FSD in 190-250 V range, ± 5% FSD outside this range) on three-phase supply and one extra phase (230 V AC analog input). This phase may be used for, e.g. cabinet door monitoring.
    • The AmsCPU-IO module can be powered by one, two or three phases + neutral. Nominal voltage: 230 V AC, Nominal frequency: 50/60 Hz. When powered by three phases, the AmsCPU-IO module will be able to detect phase faults on the main power supply. If a fault occurs on one or two phases, the AmsCPU-IO module will still be powered by the remaining phase(s). In this case, the AmsCPU-IO module will send an alarm to the central server.
      The AmsCPU-IO can also be powered by a 12V DC.
    • USB 2.0 (12 MB/s) for additional devices, host port, max 250 mA, 5 V
    • Analog input 0-10 V, 4-20 mA (0-20 mA): Impedance = 510 Ohms (DC)
      Accuracy = ± 2% FSD
      Can also be used as digital input:
      Threshold of approximately 1 V
      Max input voltage = 12 V (A-Bus voltage can be used.)
    • One digital input with 1 MOhm internal pull-up. Off resistance less than 100 kOhms. It is intended for use with a relay contact or an NPN open collector device on input connections 6 and 5. In addition to digital input, it can for example be used for tampering detection using the internal backup battery.
    • RJ45 connector, 100 Mbps/10 Mbps, half & full duplex
    • SMA connector for external GSM antenna. GSM900, GSM1800, GSM1900
    • The SIM card is inserted from the side without opening the cabinet.
    • Works with 802.11 a/b/g
    • In an average GridLight™ installation consisting of the AmsCPU-IO module, one AmsCurrent and one AmsBattery module, the AmsCPU-IO module typically consumes less than 2 W.
      If the AmsCPU-IO module is connected to the maximum number of client modules possible, the setup consumes max 18 W.
    • Three relays that are galvanically isolated and are used for switching minor loads on and off directly and three-phase or larger loads via an intermediate breaker. One of the three relays provides both NO and NC functionality. Max switching voltage: 250 V AC/30 V DC (resistive). Max switching load: 3A.
    • One S0 input according to the DIN 43 864 and EN 62053-31 standards.
    • One MODBUS interface based on RS485
    • Input range: 1 – 15 mA, rel. accuracy: ± 0.3% FSD, abs. accuracy ± 5% FSD Detection range: 170 -3000 mA (Absolute max rating 7000 mA)
      Please find the datasheet for the leakage current transformer under the Documentation tab.

Supported Meters

Manufacturer Model Protocol Interface
Echelon 83331I ANSI C12.18/19 AMS RS232, AMS CPU, AMS CPU-IO
Iskraemeco MT830 IEC62056-21 AMS RS232, AMS CPU, AMS CPU-IO
Larsen & Toubro ER300P Modbus AMS RS485, AMS CPU-IO
Larsen & Toubro Nova Modbus AMS RS485, AMS CPU-IO
Larsen & Toubro Quasar Modbus AMS RS485, AMS CPU-IO
Carlo Gavazzi EM24DIN Modbus AMS RS485, AMS Sense, AMS wMBus, AMS CPU-IO
Carlo Gavazzi EM21 Modbus AMS RS485, AMS Sense, AMS wMBus, AMS CPU-IO
Carlo Gavazzi EM21-72R Modbus AMS RS485, AMS Sense, AMS wMBus, AMS CPU-IO
Carlo Gavazzi EM21-72D Modbus AMS RS485, AMS Sense, AMS wMBus, AMS CPU-IO
Circutor CVM-NET Modbus AMS RS485, AMS CPU-IO
DEIF AMP380 Modbus (via ext interface) AMS RS485, AMS CPU-IO
ZheLiang Yongtailong Electric DDS-1Y Modbus AMS RS485, AMS CPU-IO
Elster AS1440 IEC-62056-21 AmsCPU/AmsCPU-IO + USB-to-RS485 converter
* * IEC-62056-21 AmsCPU/AmsCPU-IO + USB-to-RS485 converter
Manufacturer Model Protocol Interface
Various manufacturers Pulse-generating meters S0 pulse AMS CPU-IO, AMS Sense, AMS wMBus
Manufacturer Model Protocol Interface
Manufacturer Model Protocol Interface
Manufacturer Model Protocol Interface
Danfoss ECL 210/310 Modbus AMS RS485, AMS CPU-IO
Grundfos Magna 3 Modbus AMS RS485, AMS CPU-IO

More meters can be supported using add-on AMS modules – see full list of supported meters, interfaces and protocols here.

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