We report on the experience with a control system for a testbeam campaign with one fully equipped supermodule of the CMS electromagnetic calorimeter. We will describe the DCS hardware which comprised ELMBs and a PLC for environmental sensor readouts, as well as CAEN crates for high and low voltage. The control system was implemented as a Finite State Machine, using the latest PVSS and JCOP Framework versions.
The system has been running as distributed system on three PCs.