DF125 –PPP Router
5
The RTU’s are normally used as standalone equipment and implemented to perform local control for
immediate action upon abnormal process behavior at low power and high connectivity.
The telecom system is the important solution to address the long distances issue introduced by such
applications. Various scenarios are known and implemented in different locations, e.g. satellite
communication, fiber optics, radio network, GSM/GPRS, 3G, Tetra, etc.
Finally, the MTU is the concentrator of all data coming from different RTUs via telecom and compiled
into a single database. The MTU is also implemented to operate, configure, and maintain all RTUs
remotely based on various protocols.
Standard OPC and Foundation Fieldbus High Speed Ethernet (FF HSE) communication protocols are
used to provide all means to send/receive data to/from RTUs.
In the case of narrowed network bandwidths, specific protocols can also be implemented, such as
DNP3 which will target data collection from RTUs where the network cannot be accessed 100% of
the time in a shared environment (supervision, control, and voice).
Figure 2 – System overview using MTU, RTU and DF125
Installation and Configuration
DF125 modules use the same modular concept as the DFI302 line, designed to be interchangeable
in standard Smar racks. See Mounting the module in the rack topic for installation details.
The DF125 can be installed on the DF9 (Individual Support for Module), fitted to the DIN rail.
The DF125 module needs an external power supply, as it is not powered via rack. See the
requirements for the power supply in the Technical Specifications topic. Power supplies from different
manufacturers may be used, as long as they meet the minimum quality and safety requirements.
