Pepperl+Fuchs KFD HM 16 Series Manual page 63

HART Multiplexer System KFD*-HM*-16
Appendix
Secondary variable
Additional value (measured in the process) of a field device (up to four additional values are
supported by HART). This variable can only be read by HART command 3.
Slave
A device (e. g. transmitter or valve) in a Master-Slave system that receives commands from a
 Master device. A Slave is not able to initiate a transaction.
"Smart" field device
Microprocessor-based device that can be programmed, has memory, is capable of performing
calculations and self-diagnostics and reporting faults, and can be communicated with from a
remote location.
Tag
Unique tag (designation of the control engineering point) of the field device within the process
plant.
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