Analogue devices survive in digital world
A
ProSoft Technology product story
Edited by the Engineeringtalk editorial team
Jan 14, 2008
HART-enabled devices provide two simultaneous communication channels transmitted via a single pair of wires.
Analogue signals have been used for decades in devices from radio and television broadcasting to traditional telephone lines.
On the industrial side, HART (highway addressable remote transducer) analogue still has an important place in a digitally dominated world, for applications needing to expedite data retrieval from field devices.
The ProLinx EtherNet/IP to HART analogue gateway (5208-DFNT-HART) provides this type of extremely fast communication from a host operating on an EtherNet/IP network (such as a PC) to HART field devices.
HART-enabled devices provide two simultaneous communication channels transmitted via a single pair of wires.
This approach offers the fastest possible data transfer of a single primary control variable over the analogue channel.
It is backward-compatible with most existing analogue I/O systems and faster than any other field communications protocol, with almost instantaneous response time from the 4-20mA analogue signal, depending upon the signal dampening built into the system.
For applications such as oil, gas and petrochemical where speed is a requirement from HART instruments, the EtherNet/IP to HART analogue gateway is ideal.
The gateway allows the primary variable to be monitored in addition to tertiary data such as temperature, software updates and general device status.
The gateway is suitable for remote applications because it is equipped with a power-supply-unit (PSU) that allows it to be connected directly in the field, reducing cable run and the associated costs.
Additionally, if the application has the gateway connected to a controller monitored from a local site office, a user may pull data from the gateway to view, control and run diagnostics over Ethernet from a PC.
The gateway is available in either four or eight-channel HART and each channel operates independently, or one-to-one with a specific device, thus ensuring the fastest possible update times from HART field devices.
Additionally, field device status data such as temperature, pressure and multivariable units are traditionally transferred using digital HART, but the 5208-DFNT-HART gateway is able to pull this data via HART analogue.
This combination creates greater flexibility for applications and allows a quick data refresh.
The EtherNet/IP to HART analogue ProLinx Gateway comes with a one-year warranty.
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