II - DCE FEL ČVUT v Praze

Glossary
M
Master
Master class 1
Master class 2
Master-slave
principle
Measuring point
identifier
Modem
Monodrop
Module parameters
N
Non-isolated
Glossary-8
A device which is able to send data to other devices and request data from
them (= active device) when in possession of the token.
Examples of DP masters include the CPU 315-2 DP and the IM 308-C.
Master responsible for the exchange of user data. Master class 1 is also used
for parameter assignment and diagnostics of the distributed I/O.
Master responsible for control, setup and configuration tasks, for example,
parameter assignment and diagnostics of the field devices which are connected
to the distributed I/O.
Bus access method whereby only one device at a time is the DP master
and all the other devices are DP slaves.
Unique identifier for the measuring point, consisting of 8 characters. It is
stored in the HART field device and can be changed and displayed using
HART commands.
A modem (MOdulator / DEModulator) is a device which converts binary
digital signals into FSK signals and vice versa. A modem does not encode
data, rather it changes the physical form of the signals.
In a monodrop communication system a maximum of two devices are
connected on the same transmission link, for example, a channel from from
the HART analog module and smart field device. The HART protocol
and the analog signal can be used simultaneously for this procedure.
Module parameters are values that can be set by the user in order to control
the behavior of a module. They can be either static or dynamic.
In non-isolated input/output modules, there is an electrical connection
between the reference potentials of the control circuit and the load circuit.
I/O Modules with Intrinsically-Safe Signals
C79000-G7076-C152-04