Glossary
TIM DNP3
344 System Manual, 12/2015, C79000-G8976-C253-04
Interface of a TIM set to the "master station" function. Use in control centers and node
stations.
The term message generally is used generally for a data message or particularly for data
messages of the application layer.
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).
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.
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.
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)
The secure method NTP (secure) uses authentication with symmetrical keys according to
the hash algorithms MD5 or SHA-1.
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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