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Extra info for Self-Organization in Embedded Real-Time Systems
For example, it reduces to a minimum the number of messages the MT exchanges. , alert messages), medium for messages which are critical Power-on start-up nominal safe degraded low power Fig. 3 State machine of the MT middleware 36 A. Bondavalli et al. , messages to signal the alert termination), and low for messages which do not impact availability and safety requirements. In Low Power state, level low messages are not exchanged anymore. From Low Power state, an MT can only move to Safe state or being switched off (there are no procedures for online battery replacing).
3 Safety Standards and MT Requirements In this section we briefly describe the main requirements presented in the CENELEC standards that need to be satisfied to develop a SIL 2 compliant component [13–17]. The MT middleware and architecture has been conceived in order to meet these requirements. Regarding hardware requirements, the standards require assurance that no single random hardware component failure mode is hazardous. This fail safety property can be achieved by (i) composite, (ii) reactive or (iii) inherent fail-safety techniques.
In the following of this Section, we first present the various layers of the MT, and then we describe how the hybrid architecture model is applied in the MT. 1 The MT Layers Three software layers can be identified in the MT: (i) application layer, (ii) management middleware and (iii) communication layer. Also ergonomic solutions, I/O devices and the hardware in general constitute an additional layer. We introduce these layers in the following of this Section (further details can be found in [3,5,37]).