The idea of Internet of Things has grown into multiple dimensions, encompassing also the industrial world leading to initiatives like Factories of the Future (FoF) or Industrial Internet. Wireless Sensor and Actuator Networks (WSAN) play an important role in this professional domain. Their successful deployment in real-world applications calls for advanced testing and debugging effort in advance. This poster presents the architecture of TWECIS, a Testbed targeting the investigation of Wireless Energy Constrained Industrial Sensor and Actuator Networks. The proposed architecture tries to unite scalability, maintainability and a cost-saving design of the testbed infrastructure with the special requirements of research in industrial wireless network design.