The AmsCPU module is the central processing unit in the Amplex Module System. 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 between the modules takes place by means of an A-Bus interface which is based on the industrially proven RS-485 technology. The A-Bus interface is also used for power supply between the modules.
The AmsCPU module serves as a WAN communications and data concentrator module. The module comes in three variants to provide a two-way communication with the central server using 2G/3G/4G, NB-IoT (NB2), LTE-M (M1), WiFi (option), SMS, 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 WIMAX 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 module until scheduled delivery. Software and configurations are updated remotely from the server and stored on the AmsCPU 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.
Voltage values on all three phases of the main supply are monitored by the AmsCPU module. If the module is installed together with an AmsBattery module, the AmsCPU will be supplied with backup power via the A-Bus in the event of power failure. This enables the AmsCPU module to store data and send a main power failure alarm to the central server before it shuts down safely.
Communication class availability
Over/under voltage (every phase)
Main power failure
Phase fault (every phase)
Extra phase, for example cabinet door Photocell for streetlight control
The Amplex Communication Framework (AmpCom) enables two-way multi-carrier communication. AmpCom uses communication classes to define 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 module are automatically discovered by the system. In case a module/meter is disconnected from the AmsCPU, this is reported to the server application and the module/meter is listed as missing. If the module/meter is reconnected to the AmsCPU or another AmsCPU, it will be rediscovered by the system.
The AmsCPU 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 non-volatile memory which holds the values until they are sent to the server. The AmsCPU 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 modules remotely. Enables installation, removal, and upgrade of software through a web user interface on one or more selected AmsCPU 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 configuration data can be changed, as required. The configuration data include:
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)
CPU LED (red): indicates whether the AmsCPU 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 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 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 module will be able to detect phase faults on the main power supply. If a fault occurs on one or two phases, the AmsCPU module will still be powered by the remaining phase(s). In this case, the AmsCPU module will send an alarm to the central server.
The AmsCPU 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.
SIM card is inserted behind top part of the cabinet.
Works with 802.11 a/b/g
In an average GridLight™ installation consisting of the AmsCPU module, one AmsSwitch, one AmsCurrent and one AmsBattery module, the AmsCPU module typically consumes less than 2 W.
If the AmsCPU module is connected to the maximum number of client modules possible, the setup consumes max 18 W.
More meters can be supported using add-on AMS modules – see full list of supported meters, interfaces and protocols here.
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