Siemens SIMATIC TIM 3V-IE DNP3 System Manual page 344

Glossary
Master TIM
Interface of a TIM set to the "master station" function. Use in control centers and node
stations.
Message
The term message generally is used generally for a data message or particularly for data
messages of the application layer.
MPI
Multi Point Interface
MPI is the programming device interface of SIMATIC S7. Devices with an MPI interface (for
example a TIM), can also communicate with each other (MPI bus).
Node station
A node station is a station located between the master station and stations in the hierarchy
of a telecontrol network. One or more subordinate stations are connected to a node station.
The data traffic between these stations and the master station is handled via the node
station. Depending on the connected network type, inter-station communication or direct
data exchange between lower-level stations is possible.
Node station TIM
Interface of a TIM in a node station set to the "node station" function.
On a TIM used in a node station, one interface is set to "node station" for connection to the
higher-level master station and one or more interfaces are set to "master station" for one or
more lower-level networks.
NTP
Network Time Protocol
Ethernet-based method for synchronizing the time of day.
SIMATIC NET components that support the "NTP" function use the method without
authentication. See also: NTP (secure)
NTP (secure)
The secure method NTP (secure) uses authentication with symmetrical keys according to
the hash algorithms MD5 or SHA-1.
Object
An object contains the data of one or more process variables such as analog values,
commands, calculated values, status information on motors, sliders etc. An object has type-
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System Manual, 12/2015, C79000-G8976-C253-04
TIM DNP3