Siemens Simatic RTU303xC Series Operating Instructions Manual page 352

Accessories
C.1 Battery module
Figure C-1 RTU3030C with two battery modules
Figure C-2 RTU3030C with two battery modules (framed in red) and a total of three expansion modules (framed in green)
In the second figure battery module 1 has had two expansion modules added. Battery
module 2 has only had one expansion module added
352
Operating Instructions, 06/2019, C79000-G8976-C382-06
RTU303xC