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2. Current loop - Wikipedia

   en.wikipedia.org/wiki/Current_loop

   Note that a 4-wire instrument has a power-supply input separate from the current loop. Panel mount displays and chart recorders are commonly termed "indicator devices" or "process monitors". Several passive indicator devices may be connected in series, but a loop must have only one transmitter device and only one power source (active device).

3. Digital current loop interface - Wikipedia

   en.wikipedia.org/wiki/Digital_current_loop_interface

   A digital current loop uses the absence of current for high (space or break), and the presence of current in the loop for low (mark). [1] This is done to ensure that on normal conditions there is always current flowing and in the event of a line being cut the flow stops indefinitely, immediately raising the alarm of the event usually as the heavy noise of the teleprinter not being synchronized ...

4. Highway Addressable Remote Transducer Protocol - Wikipedia

   en.wikipedia.org/wiki/Highway_Addressable_Remote...

   In multi-drop mode the analog loop current is fixed at 4 mA and it is possible to have more than one instrument on a signal loop. HART revisions 3 through 5 allowed polling addresses of the instruments to be in the range 1–15. HART revision 6 allowed addresses 1 to 63; HART revision 7 allows addresses 0 to 63.

5. Fieldbus - Wikipedia

   en.wikipedia.org/wiki/Fieldbus

   In process automation traditionally most of the field transmitters are connected over a current loop with 4-20 mA to the controlling device. This allows not only to transmit the measured value with the level of the current, but also provide the required electrical power to the field device with just one two-wire cable of a length of more than a ...

6. Decorating for the holidays could be hazardous to your health ...

   www.aol.com/news/decorating-holidays-could...

   Safety urged: California man electrocuted while hanging Christmas lights Here are some safety tips to remember this holiday season: The CPSC recommends people make sure their live Christmas tree ...

7. Foundation Fieldbus - Wikipedia

   en.wikipedia.org/wiki/FOUNDATION_fieldbus

   Foundation Fieldbus was originally intended as a replacement for the 4-20 mA standard, and today it coexists alongside other technologies such as Modbus, Profibus, and Industrial Ethernet. Foundation Fieldbus today enjoys a growing installed base in many heavy process applications such as refining, petrochemicals, power generation, and even ...