JUXTA D Series Signal Conditioners

The signal converters introduced herein (the DA7 and DC7) are dedicated HART communication(*1) signal converters for building control systems using both HART communications and analog standardized signals (4 to 20 mA DC).

(*1)  HART stands for "highway addressable remote transducer."
        HART was put forward by Fisher-Rosemount Corp. (USA) as an open standard for industrial
        control field networks.
        There is currently an organization called the HCF (HART Communication Foundation).
        Used extensively throughout the world, the standard defines a communication protocol
        through which digital signals are superimposed on analog signals, and transmitted.

HART communication signals support a multiple signal transmission system in which traditional "DC4 to 20 mA" signals are superimposed with digital signals.

Using HART communications, it is possible to send—in addition to measured signals (temperature, current, pressure, etc.)—tag numbers, instrument names, and other information from instruments in the field to DCS. Additionally, users on the DCS side can perform zero-point and span adjustments plus a variety of parameter settings on the field instrument. (Note that both the field and DCS-side instruments must support transmitting and receiving of HART signals, and the settings supported depend on the specifications of the instruments performing the HART communications.)

The DA7 and DC7 described herein are signal converters that can be used in a HART communications loop. Of course, they are isolated between the field and DCS sides in the same manner as normal signal converters.

• DA7
  Isolated between the DCS and field, the DA7 is a dedicated input distributor that performs two-way relaying of HART communication signals
• DC7
  Isolated between the DCS and field, the DC7 is a dedicated output isolator that performs two-way relaying of HART communication signals

Product Features

• Changing existing loops to HART communication
  You can switch to HART simply by changing previously configured D series rack mount converter cards (DA1, DC0, etc.) to the DA7 or DC7.
• Performing HART communications on new loops
  This is possible simply by installing a DA7 or DC7 in the D series rack slots that correspond to the loop on which HART communications are performed.

Also, by using other D series cards, you can include instruments in the same rack that are in non-HART communications loops.

Therefore, to tailor to your site's requirements, we recommend using the DA7 and DC7 because they allow you to add on HART communication loops.