Data Acquisition & Telemetry


Wireless Ethernet I²O data acquisition and telemetry

October 2006 Data Acquisition & Telemetry

With the wide acceptance of Wi-Fi and wireless Ethernet networks, a whole new range of applications has been exposed by industry. The conversion of process signals into Modbus TCP/IP and Ethernet IP are easily achieved by using the Acromag analog or digital input/output modules. This data can then be transmitted over very long distances (typically 10 km) and either reconverted on the receiver side or written directly to PLC CPU registers and can easily be read by most popular scada systems.

This methodology has proven itself in many applications and lends itself perfectly to remote water and sewerage treatment sites when it is vital for operators to know plant conditions but where the cost of installation of cable or fibre-optic cable is prohibitive. All the modules have embedded web browser configuration pages which allows for simple settings to be made. Redundant ring technology switches also now allow for an Ethernet ring mains to be constructed wirelessly, further increasing the reliability of the system.

The Acromag modules are 1" (25,4 mm) wide DIN Rail mount units and can accept current, voltage, thermocouple and RTD inputs as well as digital voltage inputs. The analog I/O units are all at 16 bit resolution and the digital units can accept from 0 to 35 V d.c. All units carry a five year warranty and come with UL Class 1 Div2 Groups ABCD certification as standard.



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