Application And Functions; Application And Use Of The Rtu - Siemens Simatic RTU303xC Series Operating Instructions Manual

Application and functions

1.1

Application and use of the RTU

Applications
The RTU is intended for monitoring and controlling small outlying stations without a
connection to a power supply network.
In telecontrol networks, the RTU is used to connect the outlying stations to the master station
via mobile wireless or via the LAN interface of the RTU and an optional external router.
Core functions
The RTU supports the following core functions:
● Energy-saving operation
Thanks to the energy-saving operation with various operating modes (see below), the
RTU is predestined for use in geographically distributed outlying stations, measuring
points and other applications without connection to a power supply network.
The RTU can be supplied with auxiliary power via the following power sources:
– Battery modules
– External power source e.g. solar modules
● Process connection
For the process connection, the RTU is equipped with inputs and outputs:
– 8 x DI (digital inputs)
– 4 or 8 (RTU3031C) x DQ (digital outputs)
– 4 x AI (analog inputs)
– up to 16 x DI/AI via the extension board
● Controller
For simple control tasks, the process data can be linked via program blocks.
● Storing process data (Logging)
The RTU provides the option of storing the process data of the connected sensors and
the values of some internal parameters on an SD card.
Use this option when there is no communications partner in the master station for the
RTU.
You can also use the function when you transfer the process data to the master station
(optional).
RTU303xC
Operating Instructions, 06/2019, C79000-G8976-C382-06
Battery modules are available as accessories, see Appendix Battery module
(Page 351)
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