  Traditional control environments connected to physical systems are being
upgraded with novel information and communication technologies. The resulting
systems need to be adequately protected. Experimental testbeds are crucial for
the study and analysis of ongoing threats against those resulting
cyber-physical systems. The research presented in this paper discusses some
actions towards the development of a replicable and affordable cyber-physical
testbed for training and research. The architecture of the testbed is based on
real-world components, and emulates cyber-physical scenarios commanded by SCADA
(Supervisory Control And Data Acquisition) technologies. We focus on two
representative protocols, Modbus and DNP3. The paper reports as well the
development of some adversarial scenarios, in order to evaluate the testbed
under cyber-physical threat situations. Some detection strategies are evaluated
using our proposed testbed.
