A communication system for monitoring process units includes at least one process unit operably connected to an associated peripheral communication unit via a communication interface in order to transmit process variables to the associated peripheral communication unit. The process variables which are transmitted to the associated peripheral communication unit are configurable. Each peripheral communication unit is configured to receive the configured process variables from the corresponding process unit and to emit them as advertising packets. The communication system further includes a central communication unit configured to receive the advertising packets from each peripheral communication unit.