Siemens Simatic RTU303xC Series Operating Instructions Manual page 43

● Mobile wireless contract / SIM card
If the RTU is to communicate with a partner in the master station using the mobile
wireless network, you require a suitable mobile wireless contract with associated SIM
card. Depending on the contract, the RTU receives a dynamic or fixed IP address
assigned by the mobile wireless network provider.
If you want to access the RTU directly with HTTPS, the RTU needs a public IP address.
If the RTU is to transfer not only messages, but also process data, the wireless contract
must support the sending of data.
If you want to operate the protocols DNP3 and IEC directly on the WAN interface without
underlying VPN tunnels, you need a private APN to prevent third-party access.
● Communications partner
Depending on the protocol you are using, you require a suitable communications partner
for the RTU:
– Telecontrol server (TCSB)
– ST7-TIM:
– DNP3 master
– IEC master
The communications partner must be reachable from the LAN or Internet via a router, for
example SIMATIC NET SCALANCE M812.
With the DNP3 and IEC protocols make sure you have suitable security mechanisms for
the connection.
Accessories for GPS determination
The following accessories are required if the position is to be determined via GPS and if the
RTU is to synchronize its time via GPS.
● Antenna
Only use antennas from the accessories program for the RTU, refer to the section
Antennas and accessories (Page 363).
● Cabinet feedthrough for the antenna and flexible connecting cable for the protective
housing
See appendix Antenna accessories, screw connections (Page 365).
RTU303xC
Operating Instructions, 06/2019, C79000-G8976-C382-06
1.10 Scope of delivery, accessories, requirements
Application and functions
43